Spring Lock Washers

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Spring Lock Washers

Shape and dimensions of spring lock washers for general purpose (No.2) and for heavy load (No.3)

Unit : mm

Type  Dimensions of spring lock washers for general purpose (No.2)  Dimensions of spring lock washers for heavy load (No.3)
Nominal
Diameter  
Inside diameter d  Section size (Min.)  Outside
diameter
D (Max.) 
Inside diameter d  Section size
Outside
diameter
D (Max.) 
Basic
Dimension
Allowance B  Breadth b  Thickness
t (1) 
Basic
Dimension
Allowance  Breadth b  Thickness
t (1) 
2.1 +0.25
  0
0.9 0.5 4.4 - - - - -
2.5 2.6 +0.3
  0
0.6 5.2
3 3.1 1.1 0.7 5.9
(3.5) 3.6 1.2 0.8 6.6
4 4.1 +0.4
  0
1.4  1 7.6
(4.5) 4.6 1.5 1.2 8.3
5 5.1 1.7 1.3 9.2
6 6.1 2.7 1.5 12.2 6.1 +0.4
  0
2.7 1.9 12.2
(7) 7.1 2.8 1.6 13.4 7.1 2.8 2.0 13.4
8 8.2 +0.5
  0
3.2 2 15.4 8.2 +0.5
  0
3.3 2.5 15.6
10 10.2 3.7 2.5 18.4 10.2 3.9 3.0 18.8
12 12.2 +0.6
  0
4.2 3 21.5 12.2 +0.6
  0
4.4 3.6 21.9
(14) 14.2 4.7 3.5 24.5 14.2 4.8 4.2 24.7
16 16.2 +0.8
  0
5.2 4 28 16.2 +0.8
  0
5.3 4.8 28.2
(18) 18.2 5.7 4.6 31 18.2 5.9 5.4 31.4
20 20.2 6.1 5.1 33.8 20.2 +1.0
  0
6.4 6.0 34.4
(22) 22.5 +1.0
  0
6.8 5.6 37.7 22.5 7.1 6.8 38.3
24 24.5 7.1 5.9 40.3 24.5 +1.2
  0
7.6 7.2 41.3
(27) 27.5 +1.2
  0
7.9 6.8 45.3 27.5 8.6 8.3 46.7
30 30.5 8.7 7.5 49.9 - - - - -
(33) 33.5 +1.4
  0
9.5 8.2 54.7
36 36.5 10.2 9 59.1
(39) 39.5 10.7 9.5 63.1


 

In which case T2-Tmust be 0.064b or lower. However, b shall be min. value specified in this table.  

Remark: Use of parenthesized nominal diameter of thread should be discouraged.​ 

Types of washers

Unit : mm

Type  Symbol  Applicable thread parts 
General purpose  No.2
General purpose bolts, small screws and nuts
For heavy load  No.3
General purpose bolts and nuts



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