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(Non-preferred) dimensions in parentheses.

Internal tooth spring lock washers 【Table 5】TW/A

JIS B 1251 (TW/A) - 2001

Display drawing:

 *Models with different eras.

Size
2 2.5 3 (3.5) 4 (4.5) 5 6 (7)
d max
min=nominal size
dc max=nominal size
min
t Nominal Size
max
min
Number of Teeth
h
2.4 2.9 3.4 3.9 4.5 5 5.5 6.7 7.7
2.2 2.7 3.2 3.7 4.3 4.8 5.3 6.4 7.4
4.8 5.7 6.5 7.5 8.5 9.5 10 11 13
4.5 5.4 6.1 7.1 8.1 9.1 9.6 10.5 12.5
0.3 0.3 0.45 0.45 0.45 0.5 0.6 0.6 0.8
0.325 0.325 0.485 0.485 0.485 0.535 0.64 0.64 0.85
0.275 0.275 0.415 0.415 0.415 0.465 0.56 0.56 0.75
7 7 8 8 8 8 8 9 9
0.6 0.6 0.9 0.9 0.9 1 1.2 1.2 1.6
Size
8 10 12 (14) 16 (18) 20 (22) 24
d max
min=nominal size
dc max=nominal size
min
t Nominal Size
max
min
Number of Teeth
h
8.7 10.9 12.9 14.9 16.9 19.5 21.5 23.5 25.5
8.4 10.5 12.5 14.5 16.5 19 21 23 25
15 18 21 23 26 29 32 35 38
14.5 17.5 20.4 22.4 25.4 28.4 31.2 34.2 37.2
0.8 0.9 1 1 1.2 1.2 1.4 1.4 1.6
0.85 0.95 1.055 1.055 1.265 1.265 1.47 1.47 1.68
0.75 0.85 0.945 0.945 1.135 1.135 1.33 1.33 1.52
9 9 10 10 12 12 12 14 14
1.6 1.8 2 2 2.4 2.4 2.8 2.8 3.2

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