steve/countersunk-screw

Countersunk socket screw, ISO 10642 / DIN 7991, M3 to M12, any length.

v1.1.0 STEVE MIT 0

Open in STEVE

Isometric

Parameters

Thread size7 options

Length3–120 mm

Defaults built

part.py 44 lines · Python · STEVE runtime · checked

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"""ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved

profile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.

Material: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide."""

from steve import Model

size = "M4" # Thread size

length = 12 # mm Overall length (head included)

# size: (head diameter dk, head height k, hex key s)

HEADS = {

'M3': (6.72, 1.86, 2.0),

'M4': (8.96, 2.48, 2.5),

'M5': (11.2, 3.1, 3.0),

'M6': (13.44, 3.72, 4.0),

'M8': (17.92, 4.96, 5.0),

'M10': (22.4, 6.2, 6.0),

'M12': (26.88, 7.44, 8.0),

}

NOMINAL = {

'M3': 3.0,

'M4': 4.0,

'M5': 5.0,

'M6': 6.0,

'M8': 8.0,

'M10': 10.0,

'M12': 12.0,

}

dk, k, s = HEADS[size]

d = NOMINAL[size]

cone = (dk - d) / 2 # 90 degree countersink: as deep as it is wide

total = max(length, cone + 0.5)

model = Model()

with model.sketch("profile", on="XZ", name="Profile") as sk:

sk.polyline("outline", [(0, 0), (dk / 2, 0), (d / 2, -cone), (d / 2, -total), (0, -total)])

model.revolve("body", "profile", axis="Z")

with model.sketch("socket_sketch", on="XY", name="Hex socket") as sk:

sk.polygon("hex", (0, 0), s / 2, 6, inscribed=False)

model.extrude("socket", "socket_sketch", distance=-0.8 * k, op="cut")

model.material("steel-34crnimo6") # class 10.9 alloy steel

model.appearance(color="#2e3034", metalness=0.75, roughness=0.38) # black oxide finish

result = model.result()

"""ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved
profile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.

Material: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide."""
from steve import Model

size = "M4"  # Thread size
length = 12  # mm Overall length (head included)

# size: (head diameter dk, head height k, hex key s)
HEADS = {
    'M3': (6.72, 1.86, 2.0),
    'M4': (8.96, 2.48, 2.5),
    'M5': (11.2, 3.1, 3.0),
    'M6': (13.44, 3.72, 4.0),
    'M8': (17.92, 4.96, 5.0),
    'M10': (22.4, 6.2, 6.0),
    'M12': (26.88, 7.44, 8.0),
}
NOMINAL = {
    'M3': 3.0,
    'M4': 4.0,
    'M5': 5.0,
    'M6': 6.0,
    'M8': 8.0,
    'M10': 10.0,
    'M12': 12.0,
}
dk, k, s = HEADS[size]
d = NOMINAL[size]
cone = (dk - d) / 2  # 90 degree countersink: as deep as it is wide
total = max(length, cone + 0.5)

model = Model()
with model.sketch("profile", on="XZ", name="Profile") as sk:
    sk.polyline("outline", [(0, 0), (dk / 2, 0), (d / 2, -cone), (d / 2, -total), (0, -total)])
model.revolve("body", "profile", axis="Z")
with model.sketch("socket_sketch", on="XY", name="Hex socket") as sk:
    sk.polygon("hex", (0, 0), s / 2, 6, inscribed=False)
model.extrude("socket", "socket_sketch", distance=-0.8 * k, op="cut")
model.material("steel-34crnimo6")  # class 10.9 alloy steel
model.appearance(color="#2e3034", metalness=0.75, roughness=0.38)  # black oxide finish
result = model.result()

pypart.toml 24 lines · TOML

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name = "steve/countersunk-screw"

version = "1.1.0"

runtime = "steve"

license = "MIT"

summary = "Countersunk socket screw, ISO 10642 / DIN 7991, M3 to M12, any length."

description = "ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved\nprofile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.\n\nMaterial: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide.\n\nDimensions from STEVE's standard-part tables (nominal values of the standard). Envelope geometry: no modelled thread."

tags = ["fastener", "screw", "iso-10642", "din-7991", "metric"]

changes = "Materials and finishes: each part is made of its standard's engineering material, with its usual finish."

[parameters.size]

type = "choice"

default = "M4"

choices = ["M3", "M4", "M5", "M6", "M8", "M10", "M12"]

label = "Thread size"

[parameters.length]

type = "number"

default = 12

min = 3

max = 120

step = 1

unit = "mm"

label = "Length"

name = "steve/countersunk-screw"
version = "1.1.0"
runtime = "steve"
license = "MIT"
summary = "Countersunk socket screw, ISO 10642 / DIN 7991, M3 to M12, any length."
description = "ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved\nprofile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.\n\nMaterial: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide.\n\nDimensions from STEVE's standard-part tables (nominal values of the standard). Envelope geometry: no modelled thread."
tags = ["fastener", "screw", "iso-10642", "din-7991", "metric"]
changes = "Materials and finishes: each part is made of its standard's engineering material, with its usual finish."

[parameters.size]
type = "choice"
default = "M4"
choices = ["M3", "M4", "M5", "M6", "M8", "M10", "M12"]
label = "Thread size"

[parameters.length]
type = "number"
default = 12
min = 3
max = 120
step = 1
unit = "mm"
label = "Length"

Use this part

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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/countersunk-screw/v/1.1.0/raw/part.py"

Raw files, bundle and API

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

curl "https://pythonparts.org/api/v1/parts/steve/countersunk-screw/1.1.0"

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

About this part

steve58 parts

Profile

34CrNiMo6 (1.6582)Carbon & alloy steels · Custom finish · 7.8 g/cm³

Mass: 1.52 g

At the parameters shown in the viewer.

License: MIT

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

Runtime: STEVE
Built with: CadQuery 2.9.0.dev0
Published: Nov 1, 2026
Downloads: 0
Builds: 1
Stars: 0
Bundle: acb546d86220…

#fastener #screw #iso-10642 #din-7991 #metric

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PassedImports: steve

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ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved profile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length. Material: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide. Dimensions from STEVE's standard-part tables (nominal values of the standard). Envelope geometry: no modelled thread.

2.0.0 Latest Nov 1, 2026 · 1 day ago Compare with 1.1.0
1.1.0 Nov 1, 2026 · 2 days ago Compare with 1.0.0

Materials and finishes: each part is made of its standard's engineering material, with its usual finish.
1.0.0 Oct 31, 2026 · 2 days ago

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