12 mm Internal Retaining Ring (Bore Circlip), DIN 472

The 12 mm internal retaining ring (DIN 472) fits a 12 mm bore with a groove diameter of 12.5 mm, and is 1 mm thick. Here as simplified STEP files.

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

• Also searched as: 12 mm circlip
• Model id: din472-d12
• Standard: DIN 472:2017 · size 12 mm

Files

Part key	Simplified
din472-d12	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
s	Ring thickness		1		1	nominal	L1
s_lim	Ring thickness, limits	0.94		1	0.97	midpoint of min–max	L0 (max: one source)
d3	Free diameter		13		13	nominal	L1
d3_lim	Free diameter, limits	12.9		13.36	13.13	midpoint of min–max	L1
a	Lug height			3.4	3.4	single limit (max), modeled at the limit	L1
b	Radial width		1.7 ref		1.7	reference value	L1
d5	Plier hole diameter	1.5			1.5	single limit (min), modeled at the limit	L1
d2	Groove diameter		12.5		12.5	nominal	L1
m	Groove width		1.1		1.1	nominal	L1
n	Groove edge margin	0.8			0.8	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-DIN472-SZ-12.pdf.

The 12 mm internal retaining ring beside the 11 mm and the 13 mm

The 12 mm is number 5, counting from the smallest, of the 17 DIN 472 internal retaining rings published here, from 8 mm to 25 mm.

• Ring thickness (s): 1 mm on the 12 mm internal retaining ring, the same on the 11 mm and the 13 mm.
• Ring thickness, limits (s_lim): 0.94 to 1 mm on the 12 mm internal retaining ring, the same on the 11 mm and the 13 mm.
• Free diameter (d3): 13 mm on the 12 mm internal retaining ring, against 11.8 mm on the 11 mm and 14.1 mm on the 13 mm.
• Free diameter, limits (d3_lim): 12.9 to 13.36 mm on the 12 mm internal retaining ring, against 11.7 to 12.16 mm on the 11 mm and 14 to 14.46 mm on the 13 mm.
• Lug height (a): up to 3.4 mm on the 12 mm internal retaining ring, against up to 3.3 mm on the 11 mm and up to 3.6 mm on the 13 mm.
• Radial width (b): 1.7 mm (reference) on the 12 mm internal retaining ring, against 1.5 mm (reference) on the 11 mm and 1.8 mm (reference) on the 13 mm.
• Plier hole diameter (d5): at least 1.5 mm on the 12 mm internal retaining ring, against at least 1.2 mm on the 11 mm and at least 1.5 mm on the 13 mm.
• Groove diameter (d2): 12.5 mm on the 12 mm internal retaining ring, against 11.4 mm on the 11 mm and 13.6 mm on the 13 mm.

Other sizes

• One size smaller: 11 mm Internal Retaining Ring (Bore Circlip), DIN 472, 11 mm bore, 11.4 mm groove, 1 mm thick.
• One size larger: 13 mm Internal Retaining Ring (Bore Circlip), DIN 472, 13 mm bore, 13.6 mm groove, 1 mm thick.

Documents

• CC-DIN472-DS-12.pdf: 12 datasheet: values with levels, sources
• CC-DIN472-SZ-12.pdf: 12 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

fasten-it-din472, fasteners-eu-din472, hc-maschinentechnik-din472, seeger-din472. Full citations: the method page and this size's datasheet.

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