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steve/slotted-spring-pin

Slotted spring pin (roll pin), heavy duty, ISO 8752 / DIN 1481, d 1 to 50 mm, any length.

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part.py 52 lines · Python · STEVE runtime · checked
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1"""Slotted spring pin (heavy duty), ISO 8752 (DIN 1481), d 1 to 50 mm, any length.
2
3Free state (before fitting): a tube of outside diameter d1 max and wall s, both ends tapered over length a min to the end
4diameter d2 (the wall keeps its thickness through the taper), and an axial slot. ISO 8752 leaves the slot's width to
5the supplier (Table 2) but requires that the slot shall not fully close in the smallest permitted hole (clause 4: hole
6d H12, so its smallest size is d). The slot is drawn at that limit, pi * (d1 max - d) wide at the outside: the
7circumference a pin of d1 max gives up when pressed into a hole of diameter d. One end is on the XY plane at the origin, the pin along +Z, the slot at the +X side.
8"""
9import math
10
11from steve import Model
12
13diameter = 4 # mm Nominal diameter d
14length = 20 # mm Length l
15material = "spring-steel" # Material
16
17# ISO 8752:2009 Table 1, pp. 2-3 (official preview: https://cdn.standards.iteh.ai/samples/40658/df4caae79e6b4325b3bc70097ffa4274/ISO-8752-2009.pdf;
18# also https://fasten.it/en/Norms/Norm/DIN%20EN%20ISO%208752, 10-2009).
19# d: (d1 max before mounting, d2 before mounting (for reference), a min, s)
20DIMENSIONS = {
21 1: (1.3, 0.8, 0.15, 0.2), 1.5: (1.8, 1.1, 0.25, 0.3), 2: (2.4, 1.5, 0.35, 0.4), 2.5: (2.9, 1.8, 0.4, 0.5),
22 3: (3.5, 2.1, 0.5, 0.6), 3.5: (4.0, 2.3, 0.6, 0.75), 4: (4.6, 2.8, 0.65, 0.8), 4.5: (5.1, 2.9, 0.8, 1.0),
23 5: (5.6, 3.4, 0.9, 1.0), 6: (6.7, 4.0, 1.2, 1.2), 8: (8.8, 5.5, 1.6, 1.5), 10: (10.8, 6.5, 2.0, 2.0),
24 12: (12.8, 7.5, 2.0, 2.5), 13: (13.8, 8.5, 2.0, 2.5), 14: (14.8, 8.5, 2.0, 3.0), 16: (16.8, 10.5, 2.0, 3.0),
25 18: (18.9, 11.5, 2.0, 3.5), 20: (20.9, 12.5, 3.0, 4.0), 21: (21.9, 13.5, 3.0, 4.0), 25: (25.9, 15.5, 3.0, 5.0),
26 28: (28.9, 17.5, 3.0, 5.5), 30: (30.9, 18.5, 3.0, 6.0), 32: (32.9, 20.5, 3.0, 6.0), 35: (35.9, 21.5, 3.0, 7.0),
27 38: (38.9, 23.5, 4.0, 7.5), 40: (40.9, 25.5, 4.0, 7.5), 45: (45.9, 28.5, 4.0, 8.5), 50: (50.9, 31.5, 4.0, 9.5),
28}
29# material choice: (STEVE material library id, appearance colour)
30MATERIALS = {
31 "spring-steel": ("steel-c60e", "#3a3c3f"),
32 "stainless": ("stainless-420c", "#c9ccd0"), # martensitic stainless
33}
34
35if diameter not in DIMENSIONS:
36 raise ValueError(f"ISO 8752 has no diameter {diameter} mm")
37d1, d2, a, s = DIMENSIONS[diameter]
38if length <= 2 * a:
39 raise ValueError(f"length must be more than twice the taper length ({2 * a} mm)")
40outer, end = d1 / 2, d2 / 2
41gap = math.pi * (d1 - diameter) # slot width at the outside, mm
42slot_angle = math.degrees(gap / outer)
43material_id, colour = MATERIALS[material]
44
45model = Model()
46with model.sketch("wall", on="XZ", name="Wall section") as sk:
47 sk.polyline("outline", [(end - s, 0), (end, 0), (outer, a), (outer, length - a), (end, length),
48 (end - s, length), (outer - s, length - a), (outer - s, a)])
49model.revolve("pin", "wall", axis="Z", angle=360 - slot_angle, name="Pin")
50model.material(material_id, color=colour)
51result = model.result()
52

ISO 8752 (DIN 1481) heavy-duty slotted spring pin in its free state before fitting: a slotted tube of outside diameter d1 max and wall s with tapered ends (end diameter d2 over length a), with catalogue sizes as presets. The slot's width is not fixed by the standard; it is drawn as the circumference the pin gives up when pressed into a hole of its nominal diameter. One end is on the XY plane at the origin and the pin points along +Z. Dimensions from ISO 8752 (see the README).

Slotted spring pin (ISO 8752 / DIN 1481)

Heavy-duty slotted spring pin (roll pin), d 1 to 50 mm, any length, with catalogue sizes as presets.

Geometry

The pin in its free state, before fitting: a tube of outside diameter d1 max and wall s, both ends tapered over the length a min to the end diameter d2 (the wall keeps its thickness through the taper), and an axial slot. ISO 8752 leaves the slot's width to the supplier (Table 2: "Form and width of slot at the discretion of the supplier") and sets one rule (clause 4): mounted in the smallest permitted hole (diameter d, tolerance class H12), the slot shall not fully close. The slot is drawn at that limit, π × (d1 max − d) wide at the outside: the circumference a pin of d1 max gives up when pressed into a hole of diameter d. A real pin's slot is wider by the supplier's margin. One end is on the XY plane at the origin, the pin along +Z, the slot at the +X side.

Parameters

Parameter Meaning
diameter Nominal diameter d (the hole it fits), mm
length Length l, mm
material spring-steel, stainless (martensitic)

Source

ISO 8752:2009, Spring-type straight pins — Slotted, heavy duty, Table 1, pp. 2-3: d1 max before mounting, d2 before mounting (for reference), a min, s (mm); clause 4 and Table 2 for the slot (above). Read from the official preview (https://cdn.standards.iteh.ai/samples/40658/df4caae79e6b4325b3bc70097ffa4274/ISO-8752-2009.pdf) and checked against fasten.it's DIN EN ISO 8752:2009-10 (https://fasten.it/en/Norms/Norm/DIN EN ISO 8752). ISO 8752:2009 was confirmed in 2024 and is current. The 2009 edition calls the nominal diameter d1 nom; here it is d.

d d1 max d2 a min s
1 1.3 0.8 0.15 0.2
1.5 1.8 1.1 0.25 0.3
2 2.4 1.5 0.35 0.4
2.5 2.9 1.8 0.4 0.5
3 3.5 2.1 0.5 0.6
3.5 4 2.3 0.6 0.75
4 4.6 2.8 0.65 0.8
4.5 5.1 2.9 0.8 1
5 5.6 3.4 0.9 1
6 6.7 4 1.2 1.2
8 8.8 5.5 1.6 1.5
10 10.8 6.5 2 2
12 12.8 7.5 2 2.5
13 13.8 8.5 2 2.5
14 14.8 8.5 2 3
16 16.8 10.5 2 3
18 18.9 11.5 2 3.5
20 20.9 12.5 3 4
21 21.9 13.5 3 4
25 25.9 15.5 3 5
28 28.9 17.5 3 5.5
30 30.9 18.5 3 6
32 32.9 20.5 3 6
35 35.9 21.5 3 7
38 38.9 23.5 4 7.5
40 40.9 25.5 4 7.5
45 45.9 28.5 4 8.5
50 50.9 31.5 4 9.5

Corrected in this audit: d 8 a 2.0 -> 1.6 (2.0 is a max; every other row uses a min); the slot width is now explained by the clause it comes from.

Preset list: sizes of the step.parts catalogue (MIT), see library/NOTICE.md.

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