Toothed Lock Washers For General Purpose JIS B 1251（Ref.

Unit : mm

Internal Dimensions Code Nominals d D t Teeth

External
Internal
Whit- Basic Toler- Basic Toler- Basic Toler-
Internal External Metric worth Size ance Size ance Size ance

25020 2 − 2.2 4.8 0.3 7

　0
25023 2.3 − 2.5 5.3
−0.3
0.3 ±0.025 7
25026 26026 2.6 − 2.8 5.8 0.3 7 8
25030 26030 3 − 3.2 6.5 0.45 7 8
＋0.2
25035 26035 3.5 − 3.7
　0
7.5 0.45
±0.035
8 8
　0
25040 26040 4 − 4.3 8.5
−0.4
0.45 8 9
25045 26045 4.5 − 4.8 9.5 0.5 8 9
25050 26050 5 − 5.3 10 0.6
±0.04
8 10

approx. 2t 25060 26060 6 − 6.4 11 0.6 9 10

7 − 7.4 13 0.8 9 12
＋0.3 　0
25080 26080 8 − 8.4
　0
15
−0.5
0.8 9 12
25095 26095 − 3/8 9.8 17.5 0.9 ±0.05 9 12
25100 26100 10 − 10.5 18 0.9 9 12
25110 − 7/16 11.4 19.5 0.9 10 12
External 25120 26120 12 − 12.5 ＋0.4 21 1 10 12
25127 26127 − 1/2 13 　0 22.5 　0 1 ±0.055 10 12
25140 26140 14 − 14.5 23 −0.6 1 10 12
25160 26160 16 5/8 16.5 26 1.2 12 14
25180 18 − 19 29 1.2 ±0.065 12 14
25190 − 3/4 19.6 32 1.2 12 14
25200 20 − 21 ＋0.5 32 1.4
±0.07
12 14
　0 　0
25220 22 7/8 23 35
−0.8
1.4 14 16
25240 24 − 25 38 1.6
±0.08
14 16
25254 − 1 26 41 1.6 14 16

Remarks 1. Number of teeth is a standard.

approx. 2t 2. Avoid using the external toothed lock washer for Diameters less than 2.3mm

Unit : mm

d D e t
Nominals

Countersunk Dimensions
Teeth
Code Basic Toler- Approx. Max. Basic Toler-
Size ance Size ance

27030 3 3.2 6 1.8 0.4 8

27035 3.5 3.7 7 2.1 0.4 ±0.03 8

＋0.2
27040 4 4.3 　0 8 2.5 0.4 8

27045 4.5 4.8 9 2.7 0.5 9

27050 5 5.3 10 3.1 0.5 ±0.035 9

27060 6 6.4
＋0.3
12 3.8 0.5 10
　0
27080 8 8.4 16 5.1 0.6 ±0.04 12

Remarks 1. Number of teeth is a standard.

Notes 1. SUS304-CSP only.

125…Internal Part Number Structure (Standardized Product Code)

Product 126…External Material 02…SUS304-CSP
70…Spring Steel
code code Product Surface
127…Countersunk
HRC37 〜 46
Surface 01…Burnished（SUS304-CSP） Hardness
(SUS304-CSP)
code Ep-Fe ／ Zn 5 ／ trivalent CM 2 HRC40 〜 50 Material Dimensions code
30…（trivalent chromate）
（Spring Steel） (Spring Steel)

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