1.2 mm Split Pin (Cotter Pin), ISO 1234

A 1.2 mm split pin (ISO 1234). Here in 9 lengths from 8 to 25 mm, each as simplified STEP.

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

• Also searched as: 1.2 mm split pin, 1.2 mm x 8 to 1.2 mm x 25 split pins
• Model id: iso1234-d1-2
• Standard: ISO 1234:1997 · size 1.2 mm

Lengths

Length (mm)	Part key	Simplified
8	iso1234-d1-2x8	STEP
10	iso1234-d1-2x10	STEP
12	iso1234-d1-2x12	STEP
14	iso1234-d1-2x14	STEP
16	iso1234-d1-2x16	STEP
18	iso1234-d1-2x18	STEP
20	iso1234-d1-2x20	STEP
22	iso1234-d1-2x22	STEP
25	iso1234-d1-2x25	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Pin diameter	0.9		1	0.95	midpoint of min–max	L2
a	Extended prong	1.25		2.5	1.875	midpoint of min–max	L2
b	Eye length		3 ref		3	reference value	L2
c	Eye width	1.7		2	1.85	midpoint of min–max	L2

Drawing

As a PDF: CC-ISO1234-SZ-1.2.pdf.

The 1.2 mm split pin beside the 1 mm and the 1.6 mm

The 1.2 mm is number 4, counting from the smallest, of the 6 ISO 1234 split pins published here, from 0.6 mm to 2 mm.

• Pin diameter (d): 0.9 to 1 mm on the 1.2 mm split pin, against 0.8 to 0.9 mm on the 1 mm and 1.3 to 1.4 mm on the 1.6 mm.
• Extended prong (a): 1.25 to 2.5 mm on the 1.2 mm split pin, against 0.8 to 1.6 mm on the 1 mm and 1.25 to 2.5 mm on the 1.6 mm.
• Eye length (b): 3 mm (reference) on the 1.2 mm split pin, against 3 mm (reference) on the 1 mm and 3.2 mm (reference) on the 1.6 mm.
• Eye width (c): 1.7 to 2 mm on the 1.2 mm split pin, against 1.6 to 1.8 mm on the 1 mm and 2.4 to 2.8 mm on the 1.6 mm.

Other sizes

• One size smaller: 1 mm Split Pin (Cotter Pin), ISO 1234.
• One size larger: 1.6 mm Split Pin (Cotter Pin), ISO 1234.

Documents

• CC-ISO1234-DS-1.2.pdf: 1.2 datasheet: values with levels, lengths, sources
• CC-ISO1234-SZ-1.2.pdf: 1.2 drawing: this size's values on the views
• parts.json: the part record of every length (the platform contract)

Sources

amesweb-iso1234, fasten-it-iso1234, fasteners-eu-iso1234, iso1234-1997-sample. Full citations: the method page and this size's datasheet.

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