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

The 18 mm internal retaining ring (DIN 472) fits an 18 mm bore with a groove diameter of 19 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: 18 mm circlip
• Model id: din472-d18
• Standard: DIN 472:2017 · size 18 mm

Files

Part key	Simplified
din472-d18	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		19.5		19.5	nominal	L1
d3_lim	Free diameter, limits	19.37		19.92	19.645	midpoint of min–max	L1
a	Lug height			4.1	4.1	single limit (max), modeled at the limit	L1
b	Radial width		2.2 ref		2.2	reference value	L1
d5	Plier hole diameter	2			2	single limit (min), modeled at the limit	L1
d2	Groove diameter		19		19	nominal	L1
m	Groove width		1.1		1.1	nominal	L1
n	Groove edge margin	1.5			1.5	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-DIN472-SZ-18.pdf.

The 18 mm internal retaining ring beside the 17 mm and the 19 mm

The 18 mm is number 11, 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 18 mm internal retaining ring, the same on the 17 mm and the 19 mm.
• Ring thickness, limits (s_lim): 0.94 to 1 mm on the 18 mm internal retaining ring, the same on the 17 mm and the 19 mm.
• Free diameter (d3): 19.5 mm on the 18 mm internal retaining ring, against 18.3 mm on the 17 mm and 20.5 mm on the 19 mm.
• Free diameter, limits (d3_lim): 19.37 to 19.92 mm on the 18 mm internal retaining ring, against 18.17 to 18.72 mm on the 17 mm and 20.37 to 20.92 mm on the 19 mm.
• Lug height (a): up to 4.1 mm on the 18 mm internal retaining ring, against up to 3.9 mm on the 17 mm and up to 4.1 mm on the 19 mm.
• Radial width (b): 2.2 mm (reference) on the 18 mm internal retaining ring, against 2.1 mm (reference) on the 17 mm and 2.2 mm (reference) on the 19 mm.
• Plier hole diameter (d5): at least 2 mm on the 18 mm internal retaining ring, against at least 1.7 mm on the 17 mm and at least 2 mm on the 19 mm.
• Groove diameter (d2): 19 mm on the 18 mm internal retaining ring, against 17.8 mm on the 17 mm and 20 mm on the 19 mm.

Other sizes

• One size smaller: 17 mm Internal Retaining Ring (Bore Circlip), DIN 472, 17 mm bore, 17.8 mm groove, 1 mm thick.
• One size larger: 19 mm Internal Retaining Ring (Bore Circlip), DIN 472, 19 mm bore, 20 mm groove, 1 mm thick.

Documents

• CC-DIN472-DS-18.pdf: 18 datasheet: values with levels, sources
• CC-DIN472-SZ-18.pdf: 18 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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