3.5 mm Spring Pin (Roll Pin), ISO 8752

A 3.5 mm spring pin (ISO 8752) with a 0.75 mm wall and 3.8 to 4 mm across before it is fitted. Here in 17 lengths from 4 to 40 mm, each as simplified STEP.

How these parts are made, and what the levels mean: read the method

• Also searched as: 3.5 mm pin, 3.5 mm x 4 to 3.5 mm x 40 pins
• Model id: iso8752-d3-5
• Standard: ISO 8752:2009 · size 3.5 mm

Lengths

Length (mm)	Part key	Simplified
4	iso8752-d3-5x4	STEP
5	iso8752-d3-5x5	STEP
6	iso8752-d3-5x6	STEP
8	iso8752-d3-5x8	STEP
10	iso8752-d3-5x10	STEP
12	iso8752-d3-5x12	STEP
14	iso8752-d3-5x14	STEP
16	iso8752-d3-5x16	STEP
18	iso8752-d3-5x18	STEP
20	iso8752-d3-5x20	STEP
22	iso8752-d3-5x22	STEP
24	iso8752-d3-5x24	STEP
26	iso8752-d3-5x26	STEP
28	iso8752-d3-5x28	STEP
30	iso8752-d3-5x30	STEP
32	iso8752-d3-5x32	STEP
40	iso8752-d3-5x40	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Diameter, nominal		3.5		3.5	nominal	L1
d1	Outside diameter before mounting	3.8		4	3.9	midpoint of min–max	L1
d2	Inside diameter before mounting		2.3 ref		2.3	reference value	L1
a	End chamfer length	0.6		0.8	0.7	midpoint of min–max	L1
s	Wall thickness		0.75		0.75	nominal	L1
w	Slot width		1.571		1.571	nominal	L0 (nom: one source)
shear	Minimum double shear strength	9.06			9.06	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-ISO8752-SZ-3.5.pdf.

The 3.5 mm spring pin beside the 3 mm and the 4 mm

The 3.5 mm is number 4, counting from the smallest, of the 9 ISO 8752 spring pins published here, from 2 mm to 8 mm.

• Diameter, nominal (d): 3.5 mm on the 3.5 mm spring pin, against 3 mm on the 3 mm and 4 mm on the 4 mm.
• Outside diameter before mounting (d1): 3.8 to 4 mm on the 3.5 mm spring pin, against 3.3 to 3.5 mm on the 3 mm and 4.4 to 4.6 mm on the 4 mm.
• Inside diameter before mounting (d2): 2.3 mm (reference) on the 3.5 mm spring pin, against 2.1 mm (reference) on the 3 mm and 2.8 mm (reference) on the 4 mm.
• End chamfer length (a): 0.6 to 0.8 mm on the 3.5 mm spring pin, against 0.5 to 0.7 mm on the 3 mm and 0.65 to 0.85 mm on the 4 mm.
• Wall thickness (s): 0.75 mm on the 3.5 mm spring pin, against 0.6 mm on the 3 mm and 0.8 mm on the 4 mm.
• Slot width (w): 1.571 mm on the 3.5 mm spring pin, against 1.571 mm on the 3 mm and 1.885 mm on the 4 mm.
• Minimum double shear strength (shear): at least 9.06 mm on the 3.5 mm spring pin, against at least 6.32 mm on the 3 mm and at least 11.24 mm on the 4 mm.

Other sizes

• One size smaller: 3 mm Spring Pin (Roll Pin), ISO 8752.
• One size larger: 4 mm Spring Pin (Roll Pin), ISO 8752.

Documents

• CC-ISO8752-DS-3.5.pdf: 3.5 datasheet: values with levels, lengths, sources
• CC-ISO8752-SZ-3.5.pdf: 3.5 drawing: this size's values on the views
• parts.json: the part record of every length (the platform contract)

Sources

fasten-it-iso8752, fasteners-eu-iso8752, fuller-iso8752, iso8752-2009-sample, rule-iso8752-slot. Full citations: the method page and this size's datasheet.

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