steve/lead-screw-nut

T8 lead screw nut, brass: flanged, or anti-backlash with spring, for leads 2, 4 and 8 mm.

v1.0.0 Latest STEVE MIT 0

Open in STEVE

Isometric

Parameters

Preset7 sizes

Style2 options

Lead

248

The screw it fits. It names the nut; it doesn't change the outline.

Detail

fullsimple

full: mounting holes and, on the anti-backlash nut, the spring. simple: the nuts' outlines.

Defaults built

part.py 47 lines · Python · STEVE runtime · checked

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"""T8 lead screw nut, brass: the flanged nut, or the anti-backlash nut (flanged nut, spring and second nut). Axis along Z, the flange's face on the XY plane, the

body below it. The internal thread isn't modelled: the bore is the screw's 8 mm. Dimensions from the seller's drawing in the README."""

import math

import cadquery as cq

from steve import Model

style = "flange" # flange or anti-backlash

lead = 2 # mm Lead of the screw it fits (2, 4 or 8)

detail = "full" # full: with holes and, for anti-backlash, the spring; simple: the nut's outline

# Handson Technology data sheet MCH-1179, Anti-Backlash T-Nut for Lead Screw, Mechanical Dimension, p. 2, https://handsontec.com/dataspecs/Anti-backlash-T-nut.pdf

FLANGE_D, FLANGE_T, BODY_D, LENGTH, PCD = 22, 4, 10.3, 15, 16 # the flanged nut

COLLAR_D, COLLAR_T = 14, 4 # the second nut: a 14 mm collar 4 thick on the same 10.3 body, 15 long

OVERALL = 50 # the anti-backlash nut over both nuts, the spring between them

BORE = 8

HOLE = 3.5 # four mounting holes for M3; the drawing's hole figure is unclear, so this is an M3 clearance, for looks

if lead not in (2, 4, 8):

raise ValueError("The T8 nut fits leads 2, 4 and 8 (P2 with 1, 2 or 4 starts).")

model = Model()

first = cq.Workplane("XY").circle(FLANGE_D / 2).extrude(FLANGE_T).union(cq.Workplane("XY").workplane(offset=FLANGE_T - LENGTH).circle(BODY_D / 2).extrude(LENGTH - FLANGE_T), clean=False)

first = first.cut(cq.Workplane("XY").workplane(offset=FLANGE_T - LENGTH - 1).circle(BORE / 2).extrude(LENGTH + 2))

if detail == "full":

for k in range(4):

a = math.radians(90 * k)

first = first.cut(cq.Workplane("XY").workplane(offset=-1).center(PCD / 2 * math.cos(a), PCD / 2 * math.sin(a)).circle(HOLE / 2).extrude(FLANGE_T + 2))

model.add("nut", first, op="new", body="nut_body", name="Flanged nut")

bodies = ["nut_body"]

if style == "anti-backlash":

bottom = FLANGE_T - OVERALL

second = cq.Workplane("XY").workplane(offset=bottom).circle(COLLAR_D / 2).extrude(COLLAR_T).union(cq.Workplane("XY").workplane(offset=bottom + COLLAR_T).circle(BODY_D / 2).extrude(LENGTH - COLLAR_T), clean=False)

second = second.cut(cq.Workplane("XY").workplane(offset=bottom - 1).circle(BORE / 2).extrude(LENGTH + 2))

model.add("second_nut", second, op="new", body="second_body", name="Second nut")

bodies.append("second_body")

if detail == "full":

start = bottom + COLLAR_T # the spring sits over the bodies, from the second nut's collar to the flange

wire = 0.8 # the spring's wire and coil count are proportions, for looks

height = -start

path = cq.Wire.makeHelix(height / 8, height - wire, COLLAR_D / 2 - wire).moved(cq.Location(cq.Vector(0, 0, start + wire / 2)))

spring = cq.Workplane("XZ").center(COLLAR_D / 2 - wire, start + wire / 2).circle(wire / 2).sweep(cq.Workplane(obj=path), isFrenet=True)

model.add("spring", spring, op="new", body="spring_body", name="Spring")

model.material("steel-generic", bodies=["spring_body"], color="#8c8f94")

model.material("brass", bodies=bodies, color="#c9a14a")

result = model.result()

"""T8 lead screw nut, brass: the flanged nut, or the anti-backlash nut (flanged nut, spring and second nut). Axis along Z, the flange's face on the XY plane, the
body below it. The internal thread isn't modelled: the bore is the screw's 8 mm. Dimensions from the seller's drawing in the README."""
import math

import cadquery as cq
from steve import Model

style = "flange"  # flange or anti-backlash
lead = 2  # mm Lead of the screw it fits (2, 4 or 8)
detail = "full"  # full: with holes and, for anti-backlash, the spring; simple: the nut's outline

# Handson Technology data sheet MCH-1179, Anti-Backlash T-Nut for Lead Screw, Mechanical Dimension, p. 2, https://handsontec.com/dataspecs/Anti-backlash-T-nut.pdf
FLANGE_D, FLANGE_T, BODY_D, LENGTH, PCD = 22, 4, 10.3, 15, 16   # the flanged nut
COLLAR_D, COLLAR_T = 14, 4   # the second nut: a 14 mm collar 4 thick on the same 10.3 body, 15 long
OVERALL = 50   # the anti-backlash nut over both nuts, the spring between them
BORE = 8
HOLE = 3.5   # four mounting holes for M3; the drawing's hole figure is unclear, so this is an M3 clearance, for looks
if lead not in (2, 4, 8):
    raise ValueError("The T8 nut fits leads 2, 4 and 8 (P2 with 1, 2 or 4 starts).")


model = Model()
first = cq.Workplane("XY").circle(FLANGE_D / 2).extrude(FLANGE_T).union(cq.Workplane("XY").workplane(offset=FLANGE_T - LENGTH).circle(BODY_D / 2).extrude(LENGTH - FLANGE_T), clean=False)
first = first.cut(cq.Workplane("XY").workplane(offset=FLANGE_T - LENGTH - 1).circle(BORE / 2).extrude(LENGTH + 2))
if detail == "full":
    for k in range(4):
        a = math.radians(90 * k)
        first = first.cut(cq.Workplane("XY").workplane(offset=-1).center(PCD / 2 * math.cos(a), PCD / 2 * math.sin(a)).circle(HOLE / 2).extrude(FLANGE_T + 2))
model.add("nut", first, op="new", body="nut_body", name="Flanged nut")
bodies = ["nut_body"]
if style == "anti-backlash":
    bottom = FLANGE_T - OVERALL
    second = cq.Workplane("XY").workplane(offset=bottom).circle(COLLAR_D / 2).extrude(COLLAR_T).union(cq.Workplane("XY").workplane(offset=bottom + COLLAR_T).circle(BODY_D / 2).extrude(LENGTH - COLLAR_T), clean=False)
    second = second.cut(cq.Workplane("XY").workplane(offset=bottom - 1).circle(BORE / 2).extrude(LENGTH + 2))
    model.add("second_nut", second, op="new", body="second_body", name="Second nut")
    bodies.append("second_body")
    if detail == "full":
        start = bottom + COLLAR_T   # the spring sits over the bodies, from the second nut's collar to the flange
        wire = 0.8   # the spring's wire and coil count are proportions, for looks
        height = -start
        path = cq.Wire.makeHelix(height / 8, height - wire, COLLAR_D / 2 - wire).moved(cq.Location(cq.Vector(0, 0, start + wire / 2)))
        spring = cq.Workplane("XZ").center(COLLAR_D / 2 - wire, start + wire / 2).circle(wire / 2).sweep(cq.Workplane(obj=path), isFrenet=True)
        model.add("spring", spring, op="new", body="spring_body", name="Spring")
        model.material("steel-generic", bodies=["spring_body"], color="#8c8f94")
model.material("brass", bodies=bodies, color="#c9a14a")
result = model.result()

pypart.toml 78 lines · TOML

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name = "steve/lead-screw-nut"

version = "1.0.0"

runtime = "steve"

license = "MIT"

summary = "T8 lead screw nut, brass: flanged, or anti-backlash with spring, for leads 2, 4 and 8 mm."

description = """T8 brass lead screw nut, flanged or anti-backlash (flanged nut, spring and second nut). The internal thread isn't modelled. Dimensions from a seller's drawing. See the README."""

tags = ["lead-screw", "nut", "t8", "anti-backlash", "motion", "metric"]

[parameters.style]

type = "choice"

default = "flange"

choices = ["flange", "anti-backlash"]

label = "Style"

[parameters.lead]

type = "choice"

default = 2

choices = [2, 4, 8]

unit = "mm"

label = "Lead"

description = "The screw it fits. It names the nut; it doesn't change the outline."

[parameters.detail]

type = "choice"

default = "full"

choices = ["full", "simple"]

label = "Detail"

description = "full: mounting holes and, on the anti-backlash nut, the spring. simple: the nuts' outlines."

[[presets]]

id = "T8x2-anti-backlash"

title = "T8 x 2 anti-backlash nut"

params = { style = "anti-backlash", lead = 2 }

aliases = ["T8 anti-backlash nut", "T8x2 anti-backlash nut", "Tr8x2 nut", "T8x2 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x2", "screw=T8; pitch/lead=2 mm; nut style=anti_backlash_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x4-anti-backlash"

title = "T8 x 4 anti-backlash nut"

params = { style = "anti-backlash", lead = 4 }

aliases = ["T8 anti-backlash nut", "T8x4 anti-backlash nut", "Tr8x4 nut", "T8x4 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x4", "screw=T8; pitch/lead=4 mm; nut style=anti_backlash_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x8-anti-backlash"

title = "T8 x 8 anti-backlash nut"

params = { style = "anti-backlash", lead = 8 }

aliases = ["T8 anti-backlash nut", "T8x8 anti-backlash nut", "Tr8x8 nut", "T8x8 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x8", "screw=T8; pitch/lead=8 mm; nut style=anti_backlash_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x2-flange"

title = "T8 x 2 flange nut"

params = { style = "flange", lead = 2 }

aliases = ["T8 flange nut", "T8x2 flange nut", "Tr8x2 nut", "T8x2 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x2", "screw=T8; pitch/lead=2 mm; nut style=flange_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x4-flange"

title = "T8 x 4 flange nut"

params = { style = "flange", lead = 4 }

aliases = ["T8 flange nut", "T8x4 flange nut", "Tr8x4 nut", "T8x4 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x4", "screw=T8; pitch/lead=4 mm; nut style=flange_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x8-flange"

title = "T8 x 8 flange nut"

params = { style = "flange", lead = 8 }

aliases = ["T8 flange nut", "T8x8 flange nut", "Tr8x8 nut", "T8x8 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x8", "screw=T8; pitch/lead=8 mm; nut style=flange_nut; generic envelope"]

standard = "seller's drawing"

[[presets]]

id = "T8x2-flange-simple"

title = "T8 x 2 flange nut, simple"

params = { style = "flange", lead = 2, detail = "simple" }

aliases = ["T8x2 flange nut simple"]

standard = "seller's drawing"

name = "steve/lead-screw-nut"
version = "1.0.0"
runtime = "steve"
license = "MIT"
summary = "T8 lead screw nut, brass: flanged, or anti-backlash with spring, for leads 2, 4 and 8 mm."
description = """T8 brass lead screw nut, flanged or anti-backlash (flanged nut, spring and second nut). The internal thread isn't modelled. Dimensions from a seller's drawing. See the README."""
tags = ["lead-screw", "nut", "t8", "anti-backlash", "motion", "metric"]

[parameters.style]
type = "choice"
default = "flange"
choices = ["flange", "anti-backlash"]
label = "Style"

[parameters.lead]
type = "choice"
default = 2
choices = [2, 4, 8]
unit = "mm"
label = "Lead"
description = "The screw it fits. It names the nut; it doesn't change the outline."

[parameters.detail]
type = "choice"
default = "full"
choices = ["full", "simple"]
label = "Detail"
description = "full: mounting holes and, on the anti-backlash nut, the spring. simple: the nuts' outlines."

[[presets]]
id = "T8x2-anti-backlash"
title = "T8 x 2 anti-backlash nut"
params = { style = "anti-backlash", lead = 2 }
aliases = ["T8 anti-backlash nut", "T8x2 anti-backlash nut", "Tr8x2 nut", "T8x2 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x2", "screw=T8; pitch/lead=2 mm; nut style=anti_backlash_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x4-anti-backlash"
title = "T8 x 4 anti-backlash nut"
params = { style = "anti-backlash", lead = 4 }
aliases = ["T8 anti-backlash nut", "T8x4 anti-backlash nut", "Tr8x4 nut", "T8x4 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x4", "screw=T8; pitch/lead=4 mm; nut style=anti_backlash_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x8-anti-backlash"
title = "T8 x 8 anti-backlash nut"
params = { style = "anti-backlash", lead = 8 }
aliases = ["T8 anti-backlash nut", "T8x8 anti-backlash nut", "Tr8x8 nut", "T8x8 nut", "T8 lead screw anti-backlash nut", "8mm lead screw anti-backlash nut", "T8 brass nut", "T8x8", "screw=T8; pitch/lead=8 mm; nut style=anti_backlash_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x2-flange"
title = "T8 x 2 flange nut"
params = { style = "flange", lead = 2 }
aliases = ["T8 flange nut", "T8x2 flange nut", "Tr8x2 nut", "T8x2 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x2", "screw=T8; pitch/lead=2 mm; nut style=flange_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x4-flange"
title = "T8 x 4 flange nut"
params = { style = "flange", lead = 4 }
aliases = ["T8 flange nut", "T8x4 flange nut", "Tr8x4 nut", "T8x4 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x4", "screw=T8; pitch/lead=4 mm; nut style=flange_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x8-flange"
title = "T8 x 8 flange nut"
params = { style = "flange", lead = 8 }
aliases = ["T8 flange nut", "T8x8 flange nut", "Tr8x8 nut", "T8x8 nut", "T8 lead screw flange nut", "8mm lead screw flange nut", "T8 brass nut", "T8x8", "screw=T8; pitch/lead=8 mm; nut style=flange_nut; generic envelope"]
standard = "seller's drawing"

[[presets]]
id = "T8x2-flange-simple"
title = "T8 x 2 flange nut, simple"
params = { style = "flange", lead = 2, detail = "simple" }
aliases = ["T8x2 flange nut simple"]
standard = "seller's drawing"

README.md 18 lines · Markdown

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Lead screw nut

A T8 brass lead screw nut: flanged, or anti-backlash (flanged nut, spring and second nut). Axis along Z, the flange's face on the XY plane, the body below it.

Source

Handson Technology data sheet MCH-1179, Anti-Backlash T-Nut for Lead Screw, Mechanical Dimension, page 2, https://handsontec.com/dataspecs/Anti-backlash-T-nut.pdf:

Flanged nut: flange 22 across and 4 thick, body 10.3, 15 long, holes on a 16 circle.
Second nut: collar 14 across and 4 thick on the same 10.3 body, 15 long.
Anti-backlash nut: 50 overall, with a 40 spring.

This is a seller's drawing of a common unbranded nut, so check yours. The sheet shows Tr8x8; the same body is sold for leads 2, 4 and 8, so lead names the nut without changing its outline.

Not modelled: the internal thread (the bore is the screw's 8 mm) and the second nut's tabs. Proportions, for looks only: the mounting hole size (an M3 clearance, because the drawing's hole figure is unclear), and the spring's wire and coils.

T8 round and polymer nuts, and T10, Tr12 and Tr16 nuts, aren't here yet; see COVERAGE.md.

# Lead screw nut

A T8 brass lead screw nut: flanged, or anti-backlash (flanged nut, spring and second nut). Axis along Z, the flange's face on the XY plane, the body below it.

## Source

Handson Technology data sheet MCH-1179, *Anti-Backlash T-Nut for Lead Screw*, Mechanical Dimension, page 2, <https://handsontec.com/dataspecs/Anti-backlash-T-nut.pdf>:

- Flanged nut: flange 22 across and 4 thick, body 10.3, 15 long, holes on a 16 circle.
- Second nut: collar 14 across and 4 thick on the same 10.3 body, 15 long.
- Anti-backlash nut: 50 overall, with a 40 spring.

This is a seller's drawing of a common unbranded nut, so check yours. The sheet shows Tr8x8; the same body is sold for leads 2, 4 and 8, so `lead` names the nut without changing its outline.

**Not modelled:** the internal thread (the bore is the screw's 8 mm) and the second nut's tabs. **Proportions, for looks only:** the mounting hole size (an M3 clearance, because the drawing's hole figure is unclear), and the spring's wire and coils.

T8 round and polymer nuts, and T10, Tr12 and Tr16 nuts, aren't here yet; see `COVERAGE.md`.

Use this part

STEVE

Open in STEVE

Open it in STEVE The STEVE runtime runs in STEVE: open the part there, or download the code and bundle.

Get the code

curl -o part.py "https://pythonparts.org/p/steve/lead-screw-nut/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/lead-screw-nut/1.0.0"

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

About this part

steve104 parts

Profile

Brass (generic)Copper alloys · Custom finish · 8.6 g/cm³

Mass: 13.2 g

At the parameters shown in the viewer.

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 5, 2026
Downloads: 0
Builds: 0
Stars: 0
Bundle: a6a3a2308983…

#lead-screw #nut #t8 #anti-backlash #motion #metric

Checks

PassedImports: cadquery, math, steve

Every published part passes our checks before it’s listed. It is still code: read it before you use it.

Request a removal A copyright notice, or a trademark, confidential design, safety, malicious code or other problem. Report an illegal or prohibited item

T8 brass lead screw nut, flanged or anti-backlash (flanged nut, spring and second nut). The internal thread isn't modelled. Dimensions from a seller's drawing. See the README.

Lead screw nut

A T8 brass lead screw nut: flanged, or anti-backlash (flanged nut, spring and second nut). Axis along Z, the flange's face on the XY plane, the body below it.

Source

Handson Technology data sheet MCH-1179, Anti-Backlash T-Nut for Lead Screw, Mechanical Dimension, page 2, https://handsontec.com/dataspecs/Anti-backlash-T-nut.pdf:

Flanged nut: flange 22 across and 4 thick, body 10.3, 15 long, holes on a 16 circle.
Second nut: collar 14 across and 4 thick on the same 10.3 body, 15 long.
Anti-backlash nut: 50 overall, with a 40 spring.

This is a seller's drawing of a common unbranded nut, so check yours. The sheet shows Tr8x8; the same body is sold for leads 2, 4 and 8, so lead names the nut without changing its outline.

T8 round and polymer nuts, and T10, Tr12 and Tr16 nuts, aren't here yet; see COVERAGE.md.

1.0.0 Latest Nov 5, 2026 · 2 hours ago

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