steve/small-tactile-switch-tht

6 x 3.5 mm through-hole tactile switches from APEM's MJTP sheet: MJTP1243 (4.3 mm actuator) and MJTP1250 (5.0 mm), two terminals 6.5 apart.

v1.0.0 Latest STEVE MIT 0

Open in STEVE

Isometric

Parameters

Preset2 sizes

Type (MJTP number)

12431250

MJTP1243: actuator 4.3 above the board; MJTP1250: 5.0.

Defaults built

part.py 126 lines · Python · STEVE runtime · checked

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"""6 x 3.5 mm through-hole tactile switch, APEM MJTP1243 and MJTP1250 (top-operated, two terminals). The body is centred on the origin,

its underside on the board's top face (the XY plane); the body's 6.0 length and the two terminals lie along X (6.5 apart), its 3.5 depth

along Y. Dimensions from APEM's MJTP series sheet, in the README."""

from steve import Model

kind = "1243" # Type (MJTP1243 or MJTP1250)

# Each entry: (height to the actuator's top L1, overall height to the terminals' tips L).

# APEM "MJTP Series 6mm Thru-Hole Mtg. Tact Switches", catalogue section M (pages M3 to M7, PDF dated 2021-09-05/2023-04-20; the

# mm.digikey.com copy), page M6, MJTP1243 & MJTP1250, table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0),

# L .335 (8,5).

TYPES = {

"1243": (4.3, 7.8),

"1250": (5.0, 8.5),

}

# Page M6, the MJTP1243 & MJTP1250 drawing, in inches (mm); the mm values are used:

BODY_L = 6.0 # .236 (6.0), the body's length (front view)

BODY_W = 3.5 # .138 (3.5), its depth (side view)

TOP = 3.5 # .138 (3.5), the board to the cover's top

EAR_H = 0.3 # .012 (0.3), the two end bosses above the cover's top

ACT_L = 3.0 # .118 (3.0), the actuator's length (front view)

ACT_W = 1.5 # .059 (1.5), its depth (side view)

TAIL = 3.5 # .138 (3.5), the terminals' tips below the board

PITCH = 6.5 # .256 (6.5), the terminals' centres at the tips

OVER = 7.9 # .311 (7.9), over the terminals' bends

LEAD_W = 1.0 # .039 (1.0), the terminals' width (side view)

LEAD_T = 0.3 # .012 (0.3), their thickness

BEND_START = 0.7 # .028 (0.7), the board to where the terminal starts to bend out

BEND_APEX = 1.8 # .071 (1.8), the board to the bend's outermost point

BEND_END = 2.8 # .110 (2.8), the board to where the terminal is straight again

# Proportions, for looks only (the drawing doesn't dimension them; scaled from the drawing, README): the cover's thickness, the end

# bosses' size, the corner feet's recesses, and where the terminals leave the housing.

COVER_T = 0.3

EAR_L = 1.0

EAR_W = 2.0

RECESS_L = 2.2

RECESS_W = 2.5

RECESS_H = 0.4

LEAD_TOP = 0.8

if kind not in TYPES:

raise ValueError(f"no type {kind!r}: {', '.join(TYPES)}")

height, overall = TYPES[kind]

if abs(height + TAIL - overall) > 0.05:

raise ValueError("L1 and L disagree with the 3.5 tail")

hx, hy = BODY_L / 2, BODY_W / 2

housing_top = TOP - COVER_T

# model.box takes the box's centre; the XZ plane's normal is -Y, so a sketch on it extrudes towards -Y.

model = Model()

model.box("housing", BODY_L, BODY_W, housing_top - RECESS_H, at=(0, 0, (housing_top + RECESS_H) / 2), op="new", body="housing_body",

name="Housing")

# Four corner feet: the underside is recessed RECESS_L along X and RECESS_W along Y (front and side views).

foot_l = (BODY_L - RECESS_L) / 2

foot_w = (BODY_W - RECESS_W) / 2

for i, (sx, sy) in enumerate(((1, 1), (-1, 1), (-1, -1), (1, -1))):

model.box(f"foot_{i + 1}", foot_l, foot_w, RECESS_H + 0.01, at=(sx * (hx - foot_l / 2), sy * (hy - foot_w / 2), (RECESS_H + 0.01) / 2),

op="join", body="housing_body", name="Foot")

# The two end bosses stand on the cover; they are moulded with the housing, through the cover's end notches.

for i, sx in enumerate((1, -1)):

model.box(f"ear_{i + 1}", EAR_L, EAR_W, COVER_T + EAR_H + 0.01, at=(sx * (hx - EAR_L / 2), 0, housing_top - 0.01 + (COVER_T + EAR_H + 0.01) / 2),

op="join", body="housing_body", name="End boss")

# Cover: a plate over the housing with the ends notched round the bosses and an opening for the actuator.

model.box("cover", BODY_L, BODY_W, COVER_T, at=(0, 0, housing_top + COVER_T / 2), op="new", body="cover_body", name="Cover")

for i, sx in enumerate((1, -1)):

model.box(f"cover_notch_{i + 1}", EAR_L + 0.02, EAR_W, COVER_T + 0.2, at=(sx * (hx - EAR_L / 2 + 0.01), 0, housing_top + COVER_T / 2),

op="cut", body="cover_body", name="Boss notch")

model.box("cover_opening", ACT_L, ACT_W, COVER_T + 0.2, at=(0, 0, housing_top + COVER_T / 2), op="cut", body="cover_body",

name="Actuator opening")

# Actuator: from the housing's top, through the cover, up to L1.

model.box("actuator", ACT_L, ACT_W, height - housing_top, at=(0, 0, (height + housing_top) / 2), op="new", body="actuator_body",

name="Actuator")

def outline(points, t):

"""A closed outline around a polyline of straight segments, t thick (mitred corners)."""

import math

def offset(sign):

out = []

for i, (x, y) in enumerate(points):

normals = []

segments = ([(points[i - 1], points[i])] if i else []) + ([(points[i], points[i + 1])] if i + 1 < len(points) else [])

for a, b in segments:

dx, dy = b[0] - a[0], b[1] - a[1]

n = math.hypot(dx, dy)

normals.append((-dy / n, dx / n))

if len(normals) == 1:

nx, ny = normals[0]

k = 1.0

else:

nx, ny = normals[0][0] + normals[1][0], normals[0][1] + normals[1][1]

n = math.hypot(nx, ny)

nx, ny = nx / n, ny / n

k = 1 / (nx * normals[0][0] + ny * normals[0][1])

out.append((x + sign * nx * k * t / 2, y + sign * ny * k * t / 2))

return out

return offset(1) + offset(-1)[::-1]

100

101

# Terminals 1 (-X) and 2 (+X): a strip 1.0 wide and 0.3 thick down the housing's end face from LEAD_TOP, out to the bends' 7.9 overall

102

# at 1.8 below the board, back in to the 6.5 pitch at 2.8 and straight down to the tip; drawn as an outline in the XZ plane (the strip's

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# centre line offset by half the thickness) and extruded along Y.

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x_face = hx + LEAD_T / 2

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x_pin = PITCH / 2

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x_apex = OVER / 2 - LEAD_T / 2

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for _ in range(4): # the mitred outer corner reaches past half the thickness: move the bend in until it sits at OVER / 2

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path = [(x_face, LEAD_TOP), (x_face, -BEND_START), (x_apex, -BEND_APEX), (x_pin, -BEND_END), (x_pin, -TAIL)]

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x_apex -= max(x for x, z in outline(path, LEAD_T)) - OVER / 2

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path = [(x_face, LEAD_TOP), (x_face, -BEND_START), (x_apex, -BEND_APEX), (x_pin, -BEND_END), (x_pin, -TAIL)]

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leads = []

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for i, sx in enumerate((-1, 1)):

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pts = [(sx * x, z) for x, z in path]

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model.plane(f"lead_{i + 1}_plane", on="XZ", offset=-LEAD_W / 2, name=f"Terminal {i + 1}")

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with model.sketch(f"lead_{i + 1}_sketch", on=f"lead_{i + 1}_plane", name=f"Terminal {i + 1}") as sk:

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sk.polyline(f"lead_{i + 1}_outline", outline(pts, LEAD_T), closed=True)

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model.extrude(f"lead_{i + 1}", f"lead_{i + 1}_sketch", distance=LEAD_W, op="new", body=f"lead_{i + 1}_body", name=f"Terminal {i + 1}")

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leads.append(f"lead_{i + 1}_body")

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# Materials (page M3): the case and actuator black thermoplastic (pa6 for both, the sheet names no resin), the cover PET film

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# (pet; the sheet also lists tin plated brass or stainless steel for covers and brackets), the terminals silver plated brass (brass).

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model.material("pa6", bodies=["housing_body"], color="#26272a")

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model.material("pet", bodies=["cover_body"], color="#1c1d20")

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model.material("pa6", bodies=["actuator_body"], color="#202124")

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model.material("brass", bodies=leads, color="#d6d8db")

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result = model.result()

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"""6 x 3.5 mm through-hole tactile switch, APEM MJTP1243 and MJTP1250 (top-operated, two terminals). The body is centred on the origin,
its underside on the board's top face (the XY plane); the body's 6.0 length and the two terminals lie along X (6.5 apart), its 3.5 depth
along Y. Dimensions from APEM's MJTP series sheet, in the README."""
from steve import Model

kind = "1243"  # Type (MJTP1243 or MJTP1250)

# Each entry: (height to the actuator's top L1, overall height to the terminals' tips L).
#   APEM "MJTP Series 6mm Thru-Hole Mtg. Tact Switches", catalogue section M (pages M3 to M7, PDF dated 2021-09-05/2023-04-20; the
#   mm.digikey.com copy), page M6, MJTP1243 & MJTP1250, table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0),
#   L .335 (8,5).
TYPES = {
    "1243": (4.3, 7.8),
    "1250": (5.0, 8.5),
}
# Page M6, the MJTP1243 & MJTP1250 drawing, in inches (mm); the mm values are used:
BODY_L = 6.0       # .236 (6.0), the body's length (front view)
BODY_W = 3.5       # .138 (3.5), its depth (side view)
TOP = 3.5          # .138 (3.5), the board to the cover's top
EAR_H = 0.3        # .012 (0.3), the two end bosses above the cover's top
ACT_L = 3.0        # .118 (3.0), the actuator's length (front view)
ACT_W = 1.5        # .059 (1.5), its depth (side view)
TAIL = 3.5         # .138 (3.5), the terminals' tips below the board
PITCH = 6.5        # .256 (6.5), the terminals' centres at the tips
OVER = 7.9         # .311 (7.9), over the terminals' bends
LEAD_W = 1.0       # .039 (1.0), the terminals' width (side view)
LEAD_T = 0.3       # .012 (0.3), their thickness
BEND_START = 0.7   # .028 (0.7), the board to where the terminal starts to bend out
BEND_APEX = 1.8    # .071 (1.8), the board to the bend's outermost point
BEND_END = 2.8     # .110 (2.8), the board to where the terminal is straight again
# Proportions, for looks only (the drawing doesn't dimension them; scaled from the drawing, README): the cover's thickness, the end
# bosses' size, the corner feet's recesses, and where the terminals leave the housing.
COVER_T = 0.3
EAR_L = 1.0
EAR_W = 2.0
RECESS_L = 2.2
RECESS_W = 2.5
RECESS_H = 0.4
LEAD_TOP = 0.8

if kind not in TYPES:
    raise ValueError(f"no type {kind!r}: {', '.join(TYPES)}")
height, overall = TYPES[kind]
if abs(height + TAIL - overall) > 0.05:
    raise ValueError("L1 and L disagree with the 3.5 tail")
hx, hy = BODY_L / 2, BODY_W / 2
housing_top = TOP - COVER_T

# model.box takes the box's centre; the XZ plane's normal is -Y, so a sketch on it extrudes towards -Y.
model = Model()
model.box("housing", BODY_L, BODY_W, housing_top - RECESS_H, at=(0, 0, (housing_top + RECESS_H) / 2), op="new", body="housing_body",
          name="Housing")
# Four corner feet: the underside is recessed RECESS_L along X and RECESS_W along Y (front and side views).
foot_l = (BODY_L - RECESS_L) / 2
foot_w = (BODY_W - RECESS_W) / 2
for i, (sx, sy) in enumerate(((1, 1), (-1, 1), (-1, -1), (1, -1))):
    model.box(f"foot_{i + 1}", foot_l, foot_w, RECESS_H + 0.01, at=(sx * (hx - foot_l / 2), sy * (hy - foot_w / 2), (RECESS_H + 0.01) / 2),
              op="join", body="housing_body", name="Foot")
# The two end bosses stand on the cover; they are moulded with the housing, through the cover's end notches.
for i, sx in enumerate((1, -1)):
    model.box(f"ear_{i + 1}", EAR_L, EAR_W, COVER_T + EAR_H + 0.01, at=(sx * (hx - EAR_L / 2), 0, housing_top - 0.01 + (COVER_T + EAR_H + 0.01) / 2),
              op="join", body="housing_body", name="End boss")
# Cover: a plate over the housing with the ends notched round the bosses and an opening for the actuator.
model.box("cover", BODY_L, BODY_W, COVER_T, at=(0, 0, housing_top + COVER_T / 2), op="new", body="cover_body", name="Cover")
for i, sx in enumerate((1, -1)):
    model.box(f"cover_notch_{i + 1}", EAR_L + 0.02, EAR_W, COVER_T + 0.2, at=(sx * (hx - EAR_L / 2 + 0.01), 0, housing_top + COVER_T / 2),
              op="cut", body="cover_body", name="Boss notch")
model.box("cover_opening", ACT_L, ACT_W, COVER_T + 0.2, at=(0, 0, housing_top + COVER_T / 2), op="cut", body="cover_body",
          name="Actuator opening")
# Actuator: from the housing's top, through the cover, up to L1.
model.box("actuator", ACT_L, ACT_W, height - housing_top, at=(0, 0, (height + housing_top) / 2), op="new", body="actuator_body",
          name="Actuator")


def outline(points, t):
    """A closed outline around a polyline of straight segments, t thick (mitred corners)."""
    import math

    def offset(sign):
        out = []
        for i, (x, y) in enumerate(points):
            normals = []
            segments = ([(points[i - 1], points[i])] if i else []) + ([(points[i], points[i + 1])] if i + 1 < len(points) else [])
            for a, b in segments:
                dx, dy = b[0] - a[0], b[1] - a[1]
                n = math.hypot(dx, dy)
                normals.append((-dy / n, dx / n))
            if len(normals) == 1:
                nx, ny = normals[0]
                k = 1.0
            else:
                nx, ny = normals[0][0] + normals[1][0], normals[0][1] + normals[1][1]
                n = math.hypot(nx, ny)
                nx, ny = nx / n, ny / n
                k = 1 / (nx * normals[0][0] + ny * normals[0][1])
            out.append((x + sign * nx * k * t / 2, y + sign * ny * k * t / 2))
        return out
    return offset(1) + offset(-1)[::-1]


# Terminals 1 (-X) and 2 (+X): a strip 1.0 wide and 0.3 thick down the housing's end face from LEAD_TOP, out to the bends' 7.9 overall
# at 1.8 below the board, back in to the 6.5 pitch at 2.8 and straight down to the tip; drawn as an outline in the XZ plane (the strip's
# centre line offset by half the thickness) and extruded along Y.
x_face = hx + LEAD_T / 2
x_pin = PITCH / 2
x_apex = OVER / 2 - LEAD_T / 2
for _ in range(4):  # the mitred outer corner reaches past half the thickness: move the bend in until it sits at OVER / 2
    path = [(x_face, LEAD_TOP), (x_face, -BEND_START), (x_apex, -BEND_APEX), (x_pin, -BEND_END), (x_pin, -TAIL)]
    x_apex -= max(x for x, z in outline(path, LEAD_T)) - OVER / 2
path = [(x_face, LEAD_TOP), (x_face, -BEND_START), (x_apex, -BEND_APEX), (x_pin, -BEND_END), (x_pin, -TAIL)]
leads = []
for i, sx in enumerate((-1, 1)):
    pts = [(sx * x, z) for x, z in path]
    model.plane(f"lead_{i + 1}_plane", on="XZ", offset=-LEAD_W / 2, name=f"Terminal {i + 1}")
    with model.sketch(f"lead_{i + 1}_sketch", on=f"lead_{i + 1}_plane", name=f"Terminal {i + 1}") as sk:
        sk.polyline(f"lead_{i + 1}_outline", outline(pts, LEAD_T), closed=True)
    model.extrude(f"lead_{i + 1}", f"lead_{i + 1}_sketch", distance=LEAD_W, op="new", body=f"lead_{i + 1}_body", name=f"Terminal {i + 1}")
    leads.append(f"lead_{i + 1}_body")
# Materials (page M3): the case and actuator black thermoplastic (pa6 for both, the sheet names no resin), the cover PET film
# (pet; the sheet also lists tin plated brass or stainless steel for covers and brackets), the terminals silver plated brass (brass).
model.material("pa6", bodies=["housing_body"], color="#26272a")
model.material("pet", bodies=["cover_body"], color="#1c1d20")
model.material("pa6", bodies=["actuator_body"], color="#202124")
model.material("brass", bodies=leads, color="#d6d8db")
result = model.result()

pypart.toml 29 lines · TOML

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name = "steve/small-tactile-switch-tht"

version = "1.0.0"

runtime = "steve"

license = "MIT"

summary = "6 x 3.5 mm through-hole tactile switches from APEM's MJTP sheet: MJTP1243 (4.3 mm actuator) and MJTP1250 (5.0 mm), two terminals 6.5 apart."

description = """6 x 3.5 mm through-hole tactile switch (SPST-NO), APEM MJTP1243 and MJTP1250, from APEM's MJTP series sheet (catalogue page M6): a black 6.0 x 3.5 body 3.5 high, a 3.0 x 1.5 actuator 4.3 (MJTP1243) or 5.0 (MJTP1250) above the board, and two bent terminals 1.0 x 0.3, 6.5 apart, 7.9 over the bends, 3.5 below the board. See the README."""

tags = ["tactile-switch", "push-button", "switch", "through-hole", "apem", "mjtp", "6x3-5", "electronics"]

[parameters.kind]

type = "choice"

default = "1243"

choices = ["1243", "1250"]

label = "Type (MJTP number)"

description = "MJTP1243: actuator 4.3 above the board; MJTP1250: 5.0."

[[presets]]

id = "mjtp1243"

title = "APEM MJTP1243, 6 x 3.5 mm tactile switch, 4.3 mm actuator"

params = { kind = "1243" }

aliases = ["APEM MJTP1243", "MJTP1243"]

standard = "APEM MJTP"

[[presets]]

id = "mjtp1250"

title = "APEM MJTP1250, 6 x 3.5 mm tactile switch, 5.0 mm actuator"

params = { kind = "1250" }

aliases = ["APEM MJTP1250", "MJTP1250"]

standard = "APEM MJTP"

name = "steve/small-tactile-switch-tht"
version = "1.0.0"
runtime = "steve"
license = "MIT"
summary = "6 x 3.5 mm through-hole tactile switches from APEM's MJTP sheet: MJTP1243 (4.3 mm actuator) and MJTP1250 (5.0 mm), two terminals 6.5 apart."
description = """6 x 3.5 mm through-hole tactile switch (SPST-NO), APEM MJTP1243 and MJTP1250, from APEM's MJTP series sheet (catalogue page M6): a black 6.0 x 3.5 body 3.5 high, a 3.0 x 1.5 actuator 4.3 (MJTP1243) or 5.0 (MJTP1250) above the board, and two bent terminals 1.0 x 0.3, 6.5 apart, 7.9 over the bends, 3.5 below the board. See the README."""
tags = ["tactile-switch", "push-button", "switch", "through-hole", "apem", "mjtp", "6x3-5", "electronics"]

[parameters.kind]
type = "choice"
default = "1243"
choices = ["1243", "1250"]
label = "Type (MJTP number)"
description = "MJTP1243: actuator 4.3 above the board; MJTP1250: 5.0."

[[presets]]
id = "mjtp1243"
title = "APEM MJTP1243, 6 x 3.5 mm tactile switch, 4.3 mm actuator"
params = { kind = "1243" }
aliases = ["APEM MJTP1243", "MJTP1243"]
standard = "APEM MJTP"

[[presets]]
id = "mjtp1250"
title = "APEM MJTP1250, 6 x 3.5 mm tactile switch, 5.0 mm actuator"
params = { kind = "1250" }
aliases = ["APEM MJTP1250", "MJTP1250"]
standard = "APEM MJTP"

README.md 54 lines · Markdown

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Through-hole tactile switch, 6 x 3.5 mm

A 6 x 3.5 mm through-hole tactile switch (SPST-NO), APEM's MJTP1243 and MJTP1250. It has a black housing, a cover with a boss at each end, a rectangular actuator, and two bent terminals, one at each end. The body is centred on the origin, with its underside on the board's top face (the XY plane). The body's 6.0 length and the terminals lie along X: terminal 1 at -X, terminal 2 at +X. Its 3.5 depth lies along Y.

kind is the MJTP number.

Type	Actuator's top above the board (L1)	Overall, tips to actuator (L)
MJTP1243	4.3	7.8
MJTP1250	5.0	8.5

For both types:

The body is 6.0 long and 3.5 deep. Its top (the cover's) is 3.5 above the board, and the two end bosses stand 0.3 above that.
The actuator is 3.0 long (along X) and 1.5 deep (along Y).
The terminals are 1.0 wide and 0.3 thick. Their tips are 6.5 apart, centre to centre, and reach 3.5 below the board.
Each terminal runs down the housing's end, starts to bend out 0.7 below the board, is furthest out 1.8 below it (7.9 over both bends), and is straight again 2.8 below it.

Source

APEM, MJTP Series 6mm Thru-Hole Mtg. Tact Switches, catalogue section M, pages M3 to M7 (PDF created 2021-09-05, modified 2023-04-20), from the copy at mm.digikey.com (https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5561/MJTP thruhole.pdf; APEM's own site isn't used). Dimensions are in inches (mm); the mm values are used here.

Page M6, MJTP1243 & MJTP1250 drawing: body .236 (6.0) long and .138 (3.5) deep; .138 (3.5) from the board to the cover's top; the end bosses .012 (0.3) above it; actuator .118 (3.0) long and .059 (1.5) deep; terminals .039 (1.0) wide and .012 (0.3) thick, tips .256 (6.5) apart and .138 (3.5) below the board; .311 (7.9) over the bends; the bend starts .028 (0.7), is furthest out .071 (1.8), and ends .110 (2.8) below the board.
Page M6, the table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0), L .335 (8,5).
Page M3, Materials: case thermoplastic, black, UL94HB; actuator thermoplastic, black unless otherwise specified; cover/bracket PET film, tin plated brass or stainless steel; terminals silver plated brass.

The sheet gives no weight.

Proportions, for looks only. The drawing doesn't dimension the following. They are scaled from the drawing:

The cover, 0.3 thick, so the housing's top is 3.2 above the board.
The end bosses: 1.0 long (front view) and 2.0 deep (side view), at each end of the body, through notches in the cover.
The underside: four corner feet 0.4 high. The front view shows a recess 2.2 long in the middle, and the side view one 2.5 deep, so the feet are 1.9 x 0.5.
Where the terminals leave the housing: 0.8 above the board, on its end faces.

Materials follow page M3: the housing and actuator black thermoplastic (pa6; the sheet names no resin), the cover PET film (pet, dark as in the sheet's photos; the sheet also lists tin plated brass or stainless steel for covers and brackets without saying which model has which), and the terminals brass (brass), silver coloured. The sheet's photos show one switch with a light actuator, but they aren't labelled, so both types are black as the materials say. Mass check: the sheet states no weight. As modelled, MJTP1243 is 0.071 g housing + 0.006 g actuator + 0.005 g cover + 0.024 g terminals = 0.11 g.

Catalogue models

The old SW PUSH 1 P1 T 6x3.5mm H4.3 APEM MJTP1243 and SW PUSH 1 P1 T 6x3.5mm H5.0 APEM MJTP1250 models name these exact parts, so they map to MJTP1243 and MJTP1250. They were measured on the reference models (2026-11-06). The terminals (pitch, width and thickness) and the body agree with the drawing; the other differences are below.

	Old models	APEM drawing
Body	6.0 x 3.5, top 3.58 above the board	6.0 x 3.5, top 3.5
End bosses	0.8 x 2.0, about 0.3 high, tapered	0.3 high (1.0 x 2.0 drawn)
Actuator	3.5 x 1.5	3.0 x 1.5
Actuator's top	4.3 and 5.0	4.3 and 5.0
Terminals	1.0 x 0.3, tips 6.5 apart, narrowed to 0.64 below 3.0	1.0 x 0.3, tips 6.5 apart
Over the bends	7.8, furthest out 1.8 below the board	7.9, furthest out 1.8 below
Tips below the board	3.5	3.5
Underside	a recess 2.8 long across the whole depth, 0.4 high	four corner feet 0.4 high (proportion)

The family's other switches (DIP switches, slide and toggle switches, other makers' tactile switches) are other parts. See COVERAGE.md.

# Through-hole tactile switch, 6 x 3.5 mm

`kind` is the MJTP number.

| Type | Actuator's top above the board (L1) | Overall, tips to actuator (L) |

|---|---|---|

| MJTP1243 | 4.3 | 7.8 |

| MJTP1250 | 5.0 | 8.5 |

For both types:

- The body is 6.0 long and 3.5 deep. Its top (the cover's) is 3.5 above the board, and the two end bosses stand 0.3 above that.

- The actuator is 3.0 long (along X) and 1.5 deep (along Y).

- The terminals are 1.0 wide and 0.3 thick. Their tips are 6.5 apart, centre to centre, and reach 3.5 below the board.

- Each terminal runs down the housing's end, starts to bend out 0.7 below the board, is furthest out 1.8 below it (7.9 over both bends), and is straight again 2.8 below it.

## Source

APEM, *MJTP Series 6mm Thru-Hole Mtg. Tact Switches*, catalogue section M, pages M3 to M7 (PDF created 2021-09-05, modified 2023-04-20), from the copy at mm.digikey.com (<https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5561/MJTP%20thruhole.pdf>; APEM's own site isn't used). Dimensions are in inches (mm); the mm values are used here.

- Page M6, MJTP1243 & MJTP1250 drawing: body .236 (6.0) long and .138 (3.5) deep; .138 (3.5) from the board to the cover's top; the end bosses .012 (0.3) above it; actuator .118 (3.0) long and .059 (1.5) deep; terminals .039 (1.0) wide and .012 (0.3) thick, tips .256 (6.5) apart and .138 (3.5) below the board; .311 (7.9) over the bends; the bend starts .028 (0.7), is furthest out .071 (1.8), and ends .110 (2.8) below the board.

- Page M6, the table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0), L .335 (8,5).

- Page M3, Materials: case thermoplastic, black, UL94HB; actuator thermoplastic, black unless otherwise specified; cover/bracket PET film, tin plated brass or stainless steel; terminals silver plated brass.

The sheet gives no weight.

**Proportions, for looks only.** The drawing doesn't dimension the following. They are scaled from the drawing:

- The cover, 0.3 thick, so the housing's top is 3.2 above the board.

- The end bosses: 1.0 long (front view) and 2.0 deep (side view), at each end of the body, through notches in the cover.

- The underside: four corner feet 0.4 high. The front view shows a recess 2.2 long in the middle, and the side view one 2.5 deep, so the feet are 1.9 x 0.5.

- Where the terminals leave the housing: 0.8 above the board, on its end faces.

Materials follow page M3: the housing and actuator black thermoplastic (`pa6`; the sheet names no resin), the cover PET film (`pet`, dark as in the sheet's photos; the sheet also lists tin plated brass or stainless steel for covers and brackets without saying which model has which), and the terminals brass (`brass`), silver coloured. The sheet's photos show one switch with a light actuator, but they aren't labelled, so both types are black as the materials say. **Mass check:** the sheet states no weight. As modelled, MJTP1243 is 0.071 g housing + 0.006 g actuator + 0.005 g cover + 0.024 g terminals = 0.11 g.

## Catalogue models

The old `SW PUSH 1 P1 T 6x3.5mm H4.3 APEM MJTP1243` and `SW PUSH 1 P1 T 6x3.5mm H5.0 APEM MJTP1250` models name these exact parts, so they map to MJTP1243 and MJTP1250. They were measured on the reference models (2026-11-06). The terminals (pitch, width and thickness) and the body agree with the drawing; the other differences are below.

| | Old models | APEM drawing |

|---|---|---|

| Body | 6.0 x 3.5, top 3.58 above the board | 6.0 x 3.5, top 3.5 |

| End bosses | 0.8 x 2.0, about 0.3 high, tapered | 0.3 high (1.0 x 2.0 drawn) |

| Actuator | 3.5 x 1.5 | 3.0 x 1.5 |

| Actuator's top | 4.3 and 5.0 | 4.3 and 5.0 |

| Terminals | 1.0 x 0.3, tips 6.5 apart, narrowed to 0.64 below 3.0 | 1.0 x 0.3, tips 6.5 apart |

| Over the bends | 7.8, furthest out 1.8 below the board | 7.9, furthest out 1.8 below |

| Tips below the board | 3.5 | 3.5 |

| Underside | a recess 2.8 long across the whole depth, 0.4 high | four corner feet 0.4 high (proportion) |

The family's other switches (DIP switches, slide and toggle switches, other makers' tactile switches) are other parts. See `COVERAGE.md`.

# Through-hole tactile switch, 6 x 3.5 mm

A 6 x 3.5 mm through-hole tactile switch (SPST-NO), APEM's MJTP1243 and MJTP1250. It has a black housing, a cover with a boss at each end, a rectangular actuator, and two bent terminals, one at each end. The body is centred on the origin, with its underside on the board's top face (the XY plane). The body's 6.0 length and the terminals lie along X: terminal 1 at -X, terminal 2 at +X. Its 3.5 depth lies along Y.

`kind` is the MJTP number.

| Type | Actuator's top above the board (L1) | Overall, tips to actuator (L) |
|---|---|---|
| MJTP1243 | 4.3 | 7.8 |
| MJTP1250 | 5.0 | 8.5 |

For both types:

- The body is 6.0 long and 3.5 deep. Its top (the cover's) is 3.5 above the board, and the two end bosses stand 0.3 above that.
- The actuator is 3.0 long (along X) and 1.5 deep (along Y).
- The terminals are 1.0 wide and 0.3 thick. Their tips are 6.5 apart, centre to centre, and reach 3.5 below the board.
- Each terminal runs down the housing's end, starts to bend out 0.7 below the board, is furthest out 1.8 below it (7.9 over both bends), and is straight again 2.8 below it.

## Source

APEM, *MJTP Series 6mm Thru-Hole Mtg. Tact Switches*, catalogue section M, pages M3 to M7 (PDF created 2021-09-05, modified 2023-04-20), from the copy at mm.digikey.com (<https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5561/MJTP%20thruhole.pdf>; APEM's own site isn't used). Dimensions are in inches (mm); the mm values are used here.

- Page M6, MJTP1243 & MJTP1250 drawing: body .236 (6.0) long and .138 (3.5) deep; .138 (3.5) from the board to the cover's top; the end bosses .012 (0.3) above it; actuator .118 (3.0) long and .059 (1.5) deep; terminals .039 (1.0) wide and .012 (0.3) thick, tips .256 (6.5) apart and .138 (3.5) below the board; .311 (7.9) over the bends; the bend starts .028 (0.7), is furthest out .071 (1.8), and ends .110 (2.8) below the board.
- Page M6, the table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0), L .335 (8,5).
- Page M3, Materials: case thermoplastic, black, UL94HB; actuator thermoplastic, black unless otherwise specified; cover/bracket PET film, tin plated brass or stainless steel; terminals silver plated brass.

The sheet gives no weight.

**Proportions, for looks only.** The drawing doesn't dimension the following. They are scaled from the drawing:

- The cover, 0.3 thick, so the housing's top is 3.2 above the board.
- The end bosses: 1.0 long (front view) and 2.0 deep (side view), at each end of the body, through notches in the cover.
- The underside: four corner feet 0.4 high. The front view shows a recess 2.2 long in the middle, and the side view one 2.5 deep, so the feet are 1.9 x 0.5.
- Where the terminals leave the housing: 0.8 above the board, on its end faces.

Materials follow page M3: the housing and actuator black thermoplastic (`pa6`; the sheet names no resin), the cover PET film (`pet`, dark as in the sheet's photos; the sheet also lists tin plated brass or stainless steel for covers and brackets without saying which model has which), and the terminals brass (`brass`), silver coloured. The sheet's photos show one switch with a light actuator, but they aren't labelled, so both types are black as the materials say. **Mass check:** the sheet states no weight. As modelled, MJTP1243 is 0.071 g housing + 0.006 g actuator + 0.005 g cover + 0.024 g terminals = 0.11 g.

## Catalogue models

The old `SW PUSH 1 P1 T 6x3.5mm H4.3 APEM MJTP1243` and `SW PUSH 1 P1 T 6x3.5mm H5.0 APEM MJTP1250` models name these exact parts, so they map to MJTP1243 and MJTP1250. They were measured on the reference models (2026-11-06). The terminals (pitch, width and thickness) and the body agree with the drawing; the other differences are below.

| | Old models | APEM drawing |
|---|---|---|
| Body | 6.0 x 3.5, top 3.58 above the board | 6.0 x 3.5, top 3.5 |
| End bosses | 0.8 x 2.0, about 0.3 high, tapered | 0.3 high (1.0 x 2.0 drawn) |
| Actuator | 3.5 x 1.5 | 3.0 x 1.5 |
| Actuator's top | 4.3 and 5.0 | 4.3 and 5.0 |
| Terminals | 1.0 x 0.3, tips 6.5 apart, narrowed to 0.64 below 3.0 | 1.0 x 0.3, tips 6.5 apart |
| Over the bends | 7.8, furthest out 1.8 below the board | 7.9, furthest out 1.8 below |
| Tips below the board | 3.5 | 3.5 |
| Underside | a recess 2.8 long across the whole depth, 0.4 high | four corner feet 0.4 high (proportion) |

The family's other switches (DIP switches, slide and toggle switches, other makers' tactile switches) are other parts. See `COVERAGE.md`.

Use this part

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curl -o part.py "https://pythonparts.org/p/steve/small-tactile-switch-tht/v/1.0.0/raw/part.py"

Raw files, bundle and API

part.py
pypart.toml
README.md
bundle.tar.gzthe package, as published

curl "https://pythonparts.org/api/v1/parts/steve/small-tactile-switch-tht/1.0.0"

The version's JSON (parameters, presets, files); add /build?name=value for a build at other values.

About this part

steve133 parts

Profile

Polyamide 6 (nylon 6)Plastics · Custom finish · 1.15 g/cm³
PETPlastics · Custom finish · 1.38 g/cm³
Polyamide 6 (nylon 6)Plastics · Custom finish · 1.15 g/cm³
Brass (generic)Copper alloys · Custom finish · 8.6 g/cm³

Mass: 0.11 g

At the parameters shown in the viewer, 5 bodies.

License: MIT

Permissive: use, change and sell it; keep the copyright notice.

Runtime: STEVE
Requirements: None stated in the code
Built with: CadQuery 2.9.0.dev0
Published: Nov 6, 2026
Downloads: 0
Builds: 0
Stars: 0
Bundle: 968c46b38a66…

#tactile-switch #push-button #switch #through-hole #apem #mjtp #6x3-5 #electronics

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6 x 3.5 mm through-hole tactile switch (SPST-NO), APEM MJTP1243 and MJTP1250, from APEM's MJTP series sheet (catalogue page M6): a black 6.0 x 3.5 body 3.5 high, a 3.0 x 1.5 actuator 4.3 (MJTP1243) or 5.0 (MJTP1250) above the board, and two bent terminals 1.0 x 0.3, 6.5 apart, 7.9 over the bends, 3.5 below the board. See the README.

Through-hole tactile switch, 6 x 3.5 mm

kind is the MJTP number.

Type	Actuator's top above the board (L1)	Overall, tips to actuator (L)
MJTP1243	4.3	7.8
MJTP1250	5.0	8.5

For both types:

The body is 6.0 long and 3.5 deep. Its top (the cover's) is 3.5 above the board, and the two end bosses stand 0.3 above that.
The actuator is 3.0 long (along X) and 1.5 deep (along Y).
The terminals are 1.0 wide and 0.3 thick. Their tips are 6.5 apart, centre to centre, and reach 3.5 below the board.
Each terminal runs down the housing's end, starts to bend out 0.7 below the board, is furthest out 1.8 below it (7.9 over both bends), and is straight again 2.8 below it.

Source

Page M6, MJTP1243 & MJTP1250 drawing: body .236 (6.0) long and .138 (3.5) deep; .138 (3.5) from the board to the cover's top; the end bosses .012 (0.3) above it; actuator .118 (3.0) long and .059 (1.5) deep; terminals .039 (1.0) wide and .012 (0.3) thick, tips .256 (6.5) apart and .138 (3.5) below the board; .311 (7.9) over the bends; the bend starts .028 (0.7), is furthest out .071 (1.8), and ends .110 (2.8) below the board.
Page M6, the table: MJTP1243 L1 .169 (4,3), L .307 (7,8); MJTP1250 L1 .197 (5,0), L .335 (8,5).
Page M3, Materials: case thermoplastic, black, UL94HB; actuator thermoplastic, black unless otherwise specified; cover/bracket PET film, tin plated brass or stainless steel; terminals silver plated brass.

The sheet gives no weight.

Proportions, for looks only. The drawing doesn't dimension the following. They are scaled from the drawing:

The cover, 0.3 thick, so the housing's top is 3.2 above the board.
The end bosses: 1.0 long (front view) and 2.0 deep (side view), at each end of the body, through notches in the cover.
The underside: four corner feet 0.4 high. The front view shows a recess 2.2 long in the middle, and the side view one 2.5 deep, so the feet are 1.9 x 0.5.
Where the terminals leave the housing: 0.8 above the board, on its end faces.

Catalogue models

	Old models	APEM drawing
Body	6.0 x 3.5, top 3.58 above the board	6.0 x 3.5, top 3.5
End bosses	0.8 x 2.0, about 0.3 high, tapered	0.3 high (1.0 x 2.0 drawn)
Actuator	3.5 x 1.5	3.0 x 1.5
Actuator's top	4.3 and 5.0	4.3 and 5.0
Terminals	1.0 x 0.3, tips 6.5 apart, narrowed to 0.64 below 3.0	1.0 x 0.3, tips 6.5 apart
Over the bends	7.8, furthest out 1.8 below the board	7.9, furthest out 1.8 below
Tips below the board	3.5	3.5
Underside	a recess 2.8 long across the whole depth, 0.4 high	four corner feet 0.4 high (proportion)

The family's other switches (DIP switches, slide and toggle switches, other makers' tactile switches) are other parts. See COVERAGE.md.

1.0.0 Latest Nov 6, 2026 · 1 hour ago

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Source

Catalogue models

Through-hole tactile switch, 6 x 3.5 mm

Source

Catalogue models

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