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SCREWS
LOCK WASHERS
STANDARD
Internal Tooth Lock Washers
American Standard Available Material (see page 276)
ORDER EXAMPLE:
903133 - S - 32
Basic
Material: Finish:
Part Number See chart See page 278
S Spring Steel HRC 42-47
SS Stainless Steel, Type 304
B Phosphorus Bronze conforming to
ASM B159 Copper Alloy No. 510
Basic
Part
Number
903133
903135
903137
903139
903141
903143
903145
903147
903149
Normal
Washer
Size
2
4
6
8
10
1/4
5/16
3/8
7/16
A
OD
Min Max
.175 .200
.255 .270
.275 .295
.325 .340
.365 .381
.460 .478
.594 .610
.670 .694
.740 .789
B
ID
Min Max
.089 .095
.115 .123
.141 .150
.168 .176
.195 .204
.256 .267
.320 .332
.384 .398
.448 .464
C
Thickness
Min Max
.010 .015
.015 .019
.017 .021
.018 .023
.020 .025
.023 .028
.028 .034
.032 .040
.032 .040
METRIC
Metric Available Material (see page 276)
S Spring Steel HRC 42-47
SS Stainless Steel, Type 304
Basic
Part
Number
903180
903181
903183
903184
903185
903186
903187
Normal
Washer
Size
M2
M2.5
M3
M3.5
M4
M5
M6
A
OD
Min Max
4.40 4.70
5.35 5.45
6.85 7.35
7.55 8.05
8.25 8.75
10.00 10.50
12.20 12.95
B
ID
Min Max
2.25 2.40
2.65 2.80
3.15 3.30
3.65 3.80
4.15 4.30
5.15 5.30
6.20 6.50
C
Thickness
Min Max
.25 .35
.25 .35
.35 .50
.40 .55
.45 .60
.55 .70
.55 .70
STANDARD
External Tooth Lock Washers
American Standard Available Material (see page 276)
S Spring Steel HRC 42-47
SS Stainless Steel, Type 304
B Phosphorus Bronze conforming to
ASM B159 Copper Alloy No. 510
Basic Normal
Part Washer
Number Size
Not Avail.
903132
903134
903136
903138
903140
903142
903144
903146
903148
2
4
6
8
10
12
1/4
5/16
3/8
7/16
A
OD
Min Max
––
.245 .260
.305 .320
.365 .381
.395 .410
.460 .475
.494 .510
.588 .610
.670 .694
.740 .760
B
ID
Min Max
––
.115 .123
.141 .150
.168 .176
.195 .204
.221 .231
.256 .267
.320 .332
.384 .398
.448 .464
C
Thickness
Min Max
––
.015 .019
.016 .022
.018 .023
.020 .025
.023 .028
.023 .028
.028 .034
.032 .040
.032 .040
METRIC
Metric Available Material (see page 276)
S Spring Steel HRC 42-47
SS Stainless Steel, Type 304
Basic
Part
Number
903188
903189
903190
903191
903192
903193
903194
Normal
Washer
Size
M2
M2.5
M3
M3.5
M4
M5
M6
A
OD
Min Max
––
5.45 5.85
6.85 7.35
7.55 8.05
8.50 9.00
10.00 10.50
12.20 12.95
B
ID
Min Max
2.25 2.40
2.65 2.80
3.15 3.30
3.65 3.80
4.15 4.30
5.15 5.30
6.20 6.50
C
Thickness
Min Max
.25 .35
.25 .35
.35 .50
.40 .55
.45 .60
.50 .65
.55 .70
STANDARD
Split Lock Washers
American Standard Available Material (see page 276)
S Steel (1008)
SS Stainless Steel (18-8)
B Silicone Bronze conforming to
ASM B99 Copper Alloy 651 or 655
Basic
Part
Number
903150
903152
903154
903156
903158
903160
903162
903164
903166
903168
903170
Normal
Washer
Size
2
4
5
6
8
10
12
1/4
5/16
3/8
7/16
A
OD
Max2
.172
.209
.236
.250
.293
.334
.377
.489
.586
.683
.779
B
ID
Min Max
WC
Washer Section
Width* Thickness
Approx.
.088 .094 .035
.020
.115 .121 .040
.025
.128 .134 .047
.031
.141 .148 .047
.031
.168 .175 .055
.040
.194 .202 .062
.047
.221 .229 .070
.056
.255 .263 .109
.062
.318 .328 .125
.078
.382 .393 .141
.094
.446 .459 .156
.109
*American Standard washer width is approximate.
METRIC
Metric Available Material (see page 276)
S Spring Steel HRC 44-51
SS Stainless Steel, Type 304 or 316
Basic
Part
Number
903195
903196
903197
903198
903199
903200
903201
Screw
Dia
M2
M2.5
M3
M3.5
M4
M5
M6
A
OD
4.4
5.1
6.2
6.7
7.6
9.2
11.8
BC
ID Thickness
2.1 .5
2.6 .6
3.1 .8
3.6 .8
4.1 .9
5.1 1.2
6.1 1.6
157
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