Washers

stainless steel | carbon steel | alloy steel | specials


Spring Washers / Helical Lock Washers

Helical Spring Lock Washers


Description:

Helical spring washers from ITA Fasteners are mostly used to secure the loose components of machines and electrical equipment tightly. With its very high bolt tension per unit of applied torque, the screws protect the equipment from vibrations. It is available in stainless steel, carbon steel, and alloy steel to bear more wear and tear while also making it more corrosion resistant. These spring washers are one of the oldest fasteners still in use. They have been used for more than 100 years to build the equipment of ships.

Apart from their anti-loosening property, these screws offer several other notable advantages like providing a consistent torque control and load distribution across the bearing surface. These screws can also be considered as an excellent locking device, which can be used on hardened faying surfaces. The split in the coil absorbs any shock on the surface without transmitting any of the effects onto the equipment. The split is also responsible for resisting any back-off rotation of the screws.


Dimensional Standards:

DIN 7980, DIN 127, IS 6735, IS 3063, BS 4464, BS 1802, UNI 1751


Size range:

Metric: M3 to M42
Inches: As Per Requirement

SPRING WASHER HELICAL LOCK WASHER

DIN 7980 - Spring lock washer for cylinder head screws

spring lock washer
DIN 7980 spring lock washer dimensions

Legend:
d1 - Inner diameter
d2 - Outer diameter
S - Washer width
Makings:
Steel:spring steel
Stainless:A2,A4
Plastic:-
Non Ferrous:-
Thread:-
Notes:
Table according to DIN 7980:
dimensions in mm

Nominald1d2shrFor thread size
 min.max.max. Limitmin.max.  
33,13,45,61±0,122,360,2M3
3,53,63,96,11±0,122,360,2M3,5
44,14,471,2±0,12,42,830,2M4
55,15,48,81,6±0,13,23,780,2M5
66,16,59,91,6±0,13,23,780,3M6
88,18,512,72±0,144,720,5M8
1010,210,7162,5±0,1555,90,8M10
1212,212,7182,5±0,1555,90,8M12
1414,214,721,13±0,267,11M14
1616,21724,43,5±0,278,251M16
1818,21926,43,5±0,278,251M18
2020,221,230,64,5±0,2910,61M20
2222,523,532,94,5±0,2910,61M22
2424,525,535,95±0,21011,81,6M24
2727,528,538,95±0,21011,81,6M27
3030,531,744,16±0,21214,21,6M30
3333,534,747,16±0,21214,21,6M33
3636,537,752,27±0,251416,51,6M36
4242,543,760,28±0,251618,92M42
484950,5678±0,251618,92M48

DIN 127 A - Spring lock washers, From A

DIN 127A spring washer
DIN 127A spring washer dimensions

Legend:
d1 - Inner diameter
d2 - Outer diameter
S - Washer width
h - unloaded washer height
r - radius
b - side length
k - tooth height
Makings:
Steel:steel
Stainless:A2,A4
Plastic:-
Non Ferrous: Bronze
Thread:-
Notes:
Table according to DIN 127:
dimensions in mm

SizeFor threadd1 min.d1 max.d2 max.bsh min.h max.kr
3M33,13,46,21,3 ± 0,10,8 ± 0,11,92,10,150,2
3,5M3,53,63,96,71,3 ± 0,10,8 ± 0,11,92,20,150,2
4M44,14,47,61,5 ± 0,10,9 ± 0,12,12,50,150,2
5M55,15,49,21,8 ± 0,11,2 ± 0,12,73,20,150,2
6M66,46,511,82,5 ± 0,151,6 ± 0,13,64,20,20,3
7M77,17,512,82,5 ± 0,151,6 ± 0,13,64,20,20,3
8M88,18,514,83 ± 0,152 ± 0,14,65,40,30,3
10M1010,210,718,13,5 ± 0,22,2 ± 0,1555,90,30,5
12M1212,212,721,14 ± 0,22,5 ± 0,155,86,80,41
14M1414,214,724,14,5 ± 0,23 ± 0,156,880,41
16M1616,21727,45 ± 0,23,5 ± 0,27,89,20,41
18M1818,21929,45 ± 0,23,5 ± 0,27,89,20,41
20M2020,221,233,66 ± 0,24 ± 0,28,810,40,41
22M2222,523,535,96 ± 0,24 ± 0,28,810,40,41
24M2424,525,5407 ± 0,255 ± 0,211130,51,6
27M2727,528,5437 ± 0,255 ± 0,211130,51,6
30M3030,531,748,28 ± 0,256 ± 0,213,616,10,81,6
36M3636,537,758,210 ± 0,256 ± 0,213,616,10,81,6
39M3939,540,761,210 ± 0,256 ± 0,213,616,10,81,6
42M4242,543,766,212 ± 0,257 ± 0,2515,618,40,82
45M4545,546,771,212 ± 0,257 ± 0,2515,618,40,82
48M484950,67512 ± 0,257 ± 0,2515,618,412
52M525354,68314 ± 0,258 ± 0,251821,212
56M565758,58714 ± 0,258 ± 0,251821,212
60M606162,59114 ± 0,258 ± 0,251821,212
64M646566,59514 ± 0,258 ± 0,251821,212
68M686970,59914 ± 0,258 ± 0,251821,212
72M727374,510314 ± 0,258 ± 0,251821,212
80M808182,511114 ± 0,258 ± 0,251821,212
90M909192,512114 ± 0,258 ± 0,251821,212
100M100101102,513114 ± 0,258 ± 0,251821,212

BS 4464 Square Spring Washers

BS 4464 square spring washers dimensions
SizeM4M5M6M8M10M12M16M20M22M24M30M36
d1 (min/max)4.1-4.355.1-5.356.1-6.48.2-8.5510.2-10.612.2-12.616.3-16.920.3-21.122.4-23.324.4-25.330.5-31.536.5-37.6
d2 (max)6.958.559.612.7515.917.924.330.532.735.743.952.1
s (min/max)1.1-1.31.4-1.61.4-1.61.9-2.12.35-2.652.35-2.653.3-3.74.3-4.74.3-4.74.8-5.25.8-6.26.75-7.25

Inch Rectangular Section Spring Washer Spring-Steel BS1802B

spring washer dimensions
Dd1 maxd1 mind2 maxs1swgsswg
1/8"0.1370.1290.2370.048180.03221
5/32"0.170.160.30.064160.03221
3/16"0.2020.1920.3870.092130.04818
1/4"0.2670.2550.4650.092130.06416
5/16"0.3340.320.60.128100.06416
3/8"0.3990.3830.6940.14490.06416
7/16"0.4610.4450.7890.1690.06416
1/2"0.5240.5080.8510.1680.09213
9/16"0.590.571.0090.19260.09213
5/8"0.660.6361.0720.19260.12810
3/4"0.790.7621.2760.23240.12810
7/8"9.250.891.4420.25230.12810
1."1.0521.0161.6240.281-0.187-
1.1/8"1.1841.1451.750.281-0.187-

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