DIN 7993 Form A External Spring Retaining Ring, Round Cross-Section, for Shafts

The name of the fastener complying with the requirements of the German standard DIN 7993 denotes all its main characteristics. Form A means that the product is designed for installation on the outer surface of a shaft. The ring is made with a gap from round-section metal wire. Its purpose is to act as a stop against axial displacement of components and assemblies mounted on the working shaft.

The raw material for the DIN 7993 retaining ring is spring steel and corrosion-resistant chromium-nickel alloys. Stainless steel retains its characteristics and structure over a wide temperature range: from -60°C to 450°C. This is important for fastening assemblies of mechanisms and structures operating in hot-shop conditions.

Design features of the DIN 7993 external spring retaining ring

The product has the shape of an open circle, with a gap between the tips of from 1 mm to 4 mm. It is manufactured from round wire with a cross-section diameter of 0.8-3.2 mm. The outer perimeter of the products ranges from 4 mm to 65 mm, the inner — 3.2-61.8 mm.

If required, upon separate order, FLOK supplies rings with other geometric parameters. The quality of raw materials meets standard requirements.

The design of the ring allows it to be installed in a groove on a shaft or axle using an ordinary screwdriver. The tool is used to slightly spread the tips of the fastener, fit it onto the shaft, and release it. Thanks to the spring properties of the material, the ring easily returns to its original shape and seats firmly in its intended place.

The rim of the ring, protruding above the outer surface of the shaft, stops the bearing, gear or other component, preventing its free movement along the axis. Removal of the ring during repair work is carried out in reverse order.

FLOK supplies fasteners by size, material and quantity, in small and large wholesale lots, as well as retail.

Materials:

• Spring steel

Dimensions of DIN 7993 A external spring retaining rings, in mm:

d₁	d₂	d₃	d₄	e
4	3.1	3.2	0.8	1
5	4.1	4.2	0.8	1
6	5.1	5.2	0.8	1
7	6.1	6.2	0.8	2
8	7.1	7.2	0.8	2
10	9.1	9.2	0.8	2
12	10.8	11	1	3
14	12.8	13	1	3
16	14.2	14.4	1.6	3
18	16.2	16.4	1.6	3
20	17.7	18	2	3
22	19.7	20	2	3
24	21.7	22	2	3
25	22.7	23	2	3
26	23.7	24	2	3
28	25.7	26	2	3
30	27.7	28	2	3
38	35.1	35.5	2.5	4
65	61.1	61.8	3.2	4

d₁	d₂	d₃	d₄	e	r
4	3.1	3.2	0.8	1	0.5
5	4.1	4.2	0.8	1	0.5
6	5.1	5.2	0.8	1	0.5
7	6.1	6.2	0.8	2	0.5
8	7.1	7.2	0.8	2	0.5
10	9.1	9.2	0.8	2	0.5
12	10.8	11	1	3	0.6
16	14.2	14.4	1.6	3	0.9
18	16.2	16.4	1.6	3	0.9
20	17.7	18	2	3	1.1
22	19.7	20	2	3	1.1
25	22.7	23	2	3	1.1
26	23.7	24	2	3	1.1
28	25.7	26	2	3	1.1
30	27.7	28	2	3	1.1
35	32.1	32.6	2.5	4	1.4
38	35.1	35.5	2.5	4	1.4
40	37.1	37.5	2.5	4	1.4
45	42	42.5	2.5	4	1.4
48	45	45.5	2.5	4	1.4
50	47	47.5	2.5	4	1.4
55	51.1	51.8	3.2	4	1.8
60	56.1	56.8	3.2	4	1.8
65	61.1	61.8	3.2	4	1.8
70	66	66.8	3.2	5	1.8