20 mm External Retaining Ring (Shaft Circlip), DIN 471

For a 20 mm shaft, grooved to 19 mm: the external retaining ring (DIN 471), 1.2 mm thick. Download it as simplified STEP files.

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

• Also searched as: 20 mm circlip
• Model id: din471-d20
• Standard: DIN 471:2011 · size 20 mm

Files

Part key	Simplified
din471-d20	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
s	Ring thickness		1.2		1.2	nominal	L1
s_lim	Ring thickness, limits	1.14		1.2	1.17	midpoint of min–max	L0 (max: one source)
d3	Free diameter		18.5		18.5	nominal	L1
d3_lim	Free diameter, limits	18.08		18.63	18.355	midpoint of min–max	L1
a	Lug height			4	4	single limit (max), modeled at the limit	L1
b	Radial width		2.6 ref		2.6	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		1.3		1.3	nominal	L1
n	Groove edge margin	1.5			1.5	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-DIN471-SZ-20.pdf.

The 20 mm external retaining ring beside the 19 mm

The 20 mm is the largest of the 18 DIN 471 external retaining rings published here, from 3 mm to 20 mm.

• Ring thickness (s): 1.2 mm on the 20 mm external retaining ring, the same on the 19 mm.
• Ring thickness, limits (s_lim): 1.14 to 1.2 mm on the 20 mm external retaining ring, the same on the 19 mm.
• Free diameter (d3): 18.5 mm on the 20 mm external retaining ring, against 17.5 mm on the 19 mm.
• Free diameter, limits (d3_lim): 18.08 to 18.63 mm on the 20 mm external retaining ring, against 17.14 to 17.6 mm on the 19 mm.
• Lug height (a): up to 4 mm on the 20 mm external retaining ring, against up to 3.9 mm on the 19 mm.
• Radial width (b): 2.6 mm (reference) on the 20 mm external retaining ring, against 2.5 mm (reference) on the 19 mm.
• Plier hole diameter (d5): at least 2 mm on the 20 mm external retaining ring, the same on the 19 mm.
• Groove diameter (d2): 19 mm on the 20 mm external retaining ring, against 18 mm on the 19 mm.

Other sizes

• One size smaller: 19 mm External Retaining Ring (Shaft Circlip), DIN 471, 19 mm shaft, 18 mm groove, 1.2 mm thick.

Documents

• CC-DIN471-DS-20.pdf: 20 datasheet: values with levels, sources
• CC-DIN471-SZ-20.pdf: 20 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

fasten-it-din471, fasteners-eu-din471, hc-maschinentechnik-din471, seeger-din471. Full citations: the method page and this size's datasheet.

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