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

For a 4 mm shaft, grooved to 3.8 mm: the external retaining ring (DIN 471), 0.4 mm thick. Download it as simplified STEP files.

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

• Also searched as: 4 mm circlip
• Model id: din471-d4
• Standard: DIN 471:2011 · size 4 mm

Files

Part key	Simplified
din471-d4	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
s	Ring thickness		0.4		0.4	nominal	L1
s_lim	Ring thickness, limits	0.35		0.4	0.375	midpoint of min–max	L0 (max: one source)
d3	Free diameter		3.7		3.7	nominal	L1
d3_lim	Free diameter, limits	3.55		3.74	3.645	midpoint of min–max	L1
a	Lug height			2.2	2.2	single limit (max), modeled at the limit	L1
b	Radial width		0.9 ref		0.9	reference value	L1
d5	Plier hole diameter	1			1	single limit (min), modeled at the limit	L1
d2	Groove diameter		3.8		3.8	nominal	L1
m	Groove width		0.5		0.5	nominal	L1
n	Groove edge margin	0.3			0.3	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-DIN471-SZ-4.pdf.

The 4 mm external retaining ring beside the 3 mm and the 5 mm

The 4 mm is number 2, counting from the smallest, of the 18 DIN 471 external retaining rings published here, from 3 mm to 20 mm.

• Ring thickness (s): 0.4 mm on the 4 mm external retaining ring, against 0.4 mm on the 3 mm and 0.6 mm on the 5 mm.
• Ring thickness, limits (s_lim): 0.35 to 0.4 mm on the 4 mm external retaining ring, against 0.35 to 0.4 mm on the 3 mm and 0.55 to 0.6 mm on the 5 mm.
• Free diameter (d3): 3.7 mm on the 4 mm external retaining ring, against 2.7 mm on the 3 mm and 4.7 mm on the 5 mm.
• Free diameter, limits (d3_lim): 3.55 to 3.74 mm on the 4 mm external retaining ring, against 2.55 to 2.74 mm on the 3 mm and 4.55 to 4.74 mm on the 5 mm.
• Lug height (a): up to 2.2 mm on the 4 mm external retaining ring, against up to 1.9 mm on the 3 mm and up to 2.5 mm on the 5 mm.
• Radial width (b): 0.9 mm (reference) on the 4 mm external retaining ring, against 0.8 mm (reference) on the 3 mm and 1.1 mm (reference) on the 5 mm.
• Plier hole diameter (d5): at least 1 mm on the 4 mm external retaining ring, the same on the 3 mm and the 5 mm.
• Groove diameter (d2): 3.8 mm on the 4 mm external retaining ring, against 2.8 mm on the 3 mm and 4.8 mm on the 5 mm.

Other sizes

• One size smaller: 3 mm External Retaining Ring (Shaft Circlip), DIN 471, 3 mm shaft, 2.8 mm groove, 0.4 mm thick.
• One size larger: 5 mm External Retaining Ring (Shaft Circlip), DIN 471, 5 mm shaft, 4.8 mm groove, 0.6 mm thick.

Documents

• CC-DIN471-DS-4.pdf: 4 datasheet: values with levels, sources
• CC-DIN471-SZ-4.pdf: 4 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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