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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Star Washers

External Star Lock Washers

Designed for use in providing increased locking force and torsional resistance, these washers are available in stainless steel, plain or zinc plated finishes. Stocked in sizes from #2 to 1 1/8".

 

 

Group codes represented: ESW
Part# examples: 43ESW, 100ESW

Nominal Washer Size
A
B
C
Inside Diameter
Outside Diameter
Thickness
MAX
MIN
MAX
MIN
MAX
MIN
4
0.112
0.123
0.115
0.260
0.245
0.019
0.014
6
0.138
0.150
0.141
0.320
0.305
0.022
0.016
8
0.164
0.176
0.168
0.381
0.365
0.023
0.018
10
0.190
0.204
0.195
0.410
0.395
0.025
0.020
12
0.216
0.231
0.221
0.475
0.460
0.028
0.023
1/4
0.250
0.267
0.256
0.510
0.494
0.028
0.023
5/16
0.312
0.332
0.320
0.610
0.588
0.034
0.028
3/8
0.375
0.398
0.384
0.694
0.670
0.040
0.032
7/16
0.438
0.464
0.448
0.760
0.740
0.040
0.032
1/2
0.500
0.530
0.513
0.900
0.880
0.045
0.037
5/8
0.625
0.663
0.641
1.070
1.045
0.050
0.042

Internal Star Lock Washers

Available in stainless steel, plain or zinc plated finishes. Stocked in sizes from #2 to 1 1/4".

Group codes represented: ISW
Part# examples: 37ISW, 62ISWZ

Nominal Washer Size
A
B
C
Inside Diameter
Outside Diameter
Thickness
MAX
MIN
MAX
MIN
MAX
MIN
2
0.086
0.092
0.089
0.200
0.175
0.015
0.010
4
0.112
0.123
0.115
0.270
0.245
0.019
0.015
6
0.138
0.150
0.141
0.295
0.275
0.021
0.017
8
0.164
0.176
0.168
0.340
0.325
0.023
0.018
10
0.190
0.204
0.195
0.381
0.365
0.025
0.020
12
0.216
0.231
0.221
0.410
0.394
0.025
0.020
1/4
0.250
0.267
0.256
0.478
0.460
0.028
0.023
5/16
0.312
0.332
0.320
0.610
0.594
0.034
0.028
3/8
0.375
0.398
0.384
0.692
0.670
0.040
0.032
7/16
0.438
0.464
0.448
0.789
0.741
0.040
0.032
1/2
0.500
0.530
0.512
0.900
0.867
0.045
0.037
5/8
0.625
0.663
0.640
1.071
1.045
0.050
0.042
1/8
PIPE
0.425
0.410
0.615
0.595
0.022
0.017

Internal-External Star Lock Washers

Stocked in sizes from #6 to 3/4".

Group codes represented: IESW
Part# examples: 25IESW

 

Nominal Washer Size
A
B
C
Inside Diameter
Outside Diameter
Thickness
MAX
MIN
MAX
MIN
MAX
MIN
6
0.0138
0.150
0.141
0.510
0.495
0.028
0.023
8
0.164
0.176
0.168
0.610
0.580
0.034
0.028
10
0.190
0.204
0.195
0.610
0.580
0.034
0.028
1/4
0.250
0.267
0.256
0.760
0.725
0.040
0.032
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