Washers

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Serrated Lock Washer - Internal & External

Internal & External Serrated Lock Washers


Description:

Serrated lock washers from ITA Fasteners provide excellent resistance to loosening. Please note that these washers come in two different types - internal toothed and external toothed. And when it comes to loosening resistance, the externally toothed washer does a better job than an internally toothed washer. But the internally toothed washer comes with greater locking abilities. It is available in stainless steel, carbon steel, and alloy steel to bear more wear and tear while also making it more corrosion resistant. It can also allow the washers to withstand extremely high stress and force.

The internally toothed washer, as the name suggests, has small projections on its inner side while the outer toothed washer has small projections on its outer diameter. In both the cases, the teeth bite into the joint material and create a holding pressure which doesn't loosen even during continuous vibrations. In most cases, a combination of both the fasteners is used to secure smaller objects in place.


Dimensional Standards:

DIN 6798, IS 5556A, IS 55568


Size range:

Metric: Screw dia M1.6 to M30
Inches: As Per Requirement

Serrated Lock Washer Dimensions

Serrated lock washer DIN 6789 A serrated lock washer dimensions

DIN 6798 A - Serrated lock washers, Form I - external

Equivalent norms: CSN 21745; UNI 8842;

Legend:
d1 - Inner diameter
d2 - Outer diameter
s1 - wall thickness
Makings:
Steel: 350-425 HV10
Stainless: A2,A4
Plastic: -
Non Ferrous: -
Thread: -
Notes: -
Table according to DIN 6798A:
dimensions in mm

Nominal sized1d2s1Min. number of teethWeight kg/1000pcsFor thread
 Nominal size - Min.Max.Nominal size - max.Min.    
1,71,71,843,63,30,390,02M1,6
2,22,22,344,54,20,390,03M2
2,72,72,845,55,20,490,045M2,5
3,23,23,3865,70,490,06M3
3,73,73,8876,640,5100,11M3,5
4,34,34,4887,640,5110,14M4
5,35,35,48109,640,6110,26M5
6,46,46,621110,570,7120,36M6
7,47,47,6212,512,070,8140,5M7
8,48,48,621514,570,8140,8M8
10,510,510,771817,570,9161,25M10
131313,2720,519,981161,6M12
151515,272423,481182,3M14
171717,272625,481,2182,9M16
191919,333029,481,4185M18
212121,333332,381,4206M20
232323,333635,381,5207,5M22
252525,333837,381,5208M24
282828,334443,381,62212M27
313131,394847,381,62214M30
dimensions of internal toothed heavy shakeproof washer

Inch Internal Toothed Heavy Shakeproof Washer Stainless Steel B18.21.1T7

SizeSizeA MaxA MinB MaxB MinC MaxC Min
1/4" 0.2500 0.2670 0.2560 0.5360 0.5000 0.0450 0.0350
5/16" 0.3125 0.3320 0.3200 0.6070 0.5900 0.0500 0.0400
3/8" 0.3750 0.3980 0.3840 0.7480 0.7000 0.0500 0.0420
7/16" 0.4375 0.4640 0.4480 0.8580 0.8000 0.0670 0.0500
1/2" 0.5000 0.5300 0.5120 0.9240 0.8800 0.0670 0.0550
9/16" 0.5625 0.5960 0.5760 1.0340 0.9900 0.0670 0.0550
5/8" 0.6250 0.6630 0.6400 1.1350 1.1000 0.0670 0.0590
3/4" 0.7500 0.7950 0.7680 1.2650 1.2400 0.0840 0.0700
7/8" 0.8750 0.9270 0.8940 1.4470 1.4000 0.0840 0.0750

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