Split Lock Washer
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Split Lock Washer

Low carbon split lock washers are used under bolt heads or nuts to increase the hold of the fastener or to increase the bearing surface. Split lock washers are helical-shaped split rings. When fastened, the two ends exert a spring force on the fastener to create increased friction and resistance to motion. Dimensional specifications are governed by ASME B18.21.1.

Governing StandardsSplit Lock Washer

ASME B18.21.1 Covers the dimensional requirements, physical properties, and related test methods for helical spring-lock washers (#0 through 3 inches), tooth-lock washers (#2 through 1 ¼ inches), and plain washers (#0 through 3 inches).

Dimensional SpecificationsSplit Lock Washer

Split Lock Washer dimensions
Per ASME B18.21.1-2009
Size Nominal A B T W BW
Inside
Diameter
Outside
Diameter
Mean Section
Thickness
Section
Width
Bearing
Width
Max Min Max Min Min Min
#2 0.0860 0.0940 0.0880 0.1720 0.0200 0.0350 0.0240
#3 0.0990 0.1070 0.1010 0.1950 0.0250 0.0400 0.0280
#4 0.1120 0.1200 0.1140 0.2090 0.0250 0.0400 0.0280
#5 0.1250 0.1330 0.1270 0.2360 0.0310 0.0470 0.0330
#6 0.1380 0.1480 0.1410 0.2500 0.0310 0.0470 0.0330
#8 0.1640 0.1740 0.1670 0.2930 0.0400 0.0550 0.0380
#10 0.1900 0.2000 0.1930 0.3340 0.0470 0.0620 0.0430
#12 0.2160 0.2270 0.2200 0.3770 0.0560 0.0700 0.0490
1/4 0.2500 0.2600 0.2520 0.4870 0.0620 0.1090 0.0760
5/16 0.3125 0.3220 0.3140 0.5830 0.0780 0.1250 0.0870
3/8 0.3750 0.3850 0.3770 0.6800 0.0940 0.1410 0.0990
7/16 0.4375 0.4500 0.4400 0.7760 0.1090 0.1560 0.1090
1/2 0.5000 0.5120 0.5020 0.8690 0.1250 0.1710 0.1200
9/16 0.5625 0.5740 0.5640 0.9650 0.1410 0.1880 0.1320
5/8 0.6250 0.6410 0.6280 1.0730 0.1560 0.2090 0.1420
3/4 0.7500 0.7660 0.7530 1.2650 0.1880 0.2340 0.1640
7/8 0.8750 0.8940 0.8780 1.4590 0.2190 0.2660 0.1860
1 1.0000 1.0240 1.0030 1.6560 0.2500 0.2970 0.2080
1 1/8 1.1250 1.1530 1.1290 1.8470 0.2810 0.3280 0.2300
1 1/4 1.2500 1.2800 1.2540 2.0360 0.3120 0.3590 0.2510
1 3/8 1.3750 1.4080 1.3790 2.2190 0.3440 0.3910 0.2740
1 1/2 1.5000 1.5340 1.5040 2.4190 0.3750 0.4220 0.2950
1 5/8 1.6250 1.6630 1.6330 2.5530 0.3890 0.4240 0.2970
1 3/4 1.7500 1.7890 1.7580 2.6790 0.3890 0.4240 0.2970
1 7/8 1.8750 1.9140 1.8830 2.8110 0.4220 0.4270 0.2990
2 2.0000 2.0390 2.0080 2.9360 0.4220 0.4270 0.2990
2 1/4 2.2500 2.2930 2.2620 3.2210 0.4400 0.4420 0.3090
2 1/2 2.5000 2.5430 2.5120 3.4710 0.4400 0.4420 0.3090
2 3/4 2.7500 2.7930 2.7620 3.8240 0.4580 0.4910 0.3440
3 3.0000 3.0430 3.0120 4.0740 0.4580 0.4910 0.3440
  1. All dimensions are in inches.
Split Lock Washer
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
1/4 0.2520 0.4870 0.0620 WLBL025 3-5 Working Days $0.05894/EA EA
5/16 0.3140 0.5830 0.0780 WLBL031 3-5 Working Days $0.0244/EA EA
3/8 0.3770 0.68 0.0940 WLBL037 In Stock $0.02792/EA EA
7/16 0.44 0.7760 0.1090 WLBL043 In Stock $0.03906/EA EA
1/2 0.5020 0.8690 0.1250 WLBL050 In Stock $0.09462/EA EA
9/16 0.5640 0.9650 0.1410 WLBL056 3-5 Working Days $0.21121/EA EA
5/8 0.6280 1.0730 0.1560 WLBL062 In Stock $0.21523/EA EA
3/4 0.7530 1.2650 0.1880 WLBL075 In Stock $0.23795/EA EA
7/8 0.8780 1.4590 0.2190 WLBL087 In Stock $0.31282/EA EA
1 1.0030 1.6560 0.25 WLBL100 In Stock $0.45755/EA EA
1 1/8 1.1290 1.8470 0.2810 WLBL112 In Stock $0.65823/EA EA
1 1/4 1.2540 2.0360 0.3120 WLBL125 In Stock $0.69866/EA EA
1 3/8 1.3790 2.2190 0.3440 WLBL137 In Stock $1.43509/EA EA
1 1/2 1.5040 2.4190 0.3750 WLBL150 In Stock $1.20026/EA EA
1 5/8 1.6330 2.5530 0.3890 WLBL162 In Stock $3.35943/EA EA
1 3/4 1.7580 2.6790 0.3890 WLBL175 In Stock $1.44041/EA EA
2 2.0080 2.9360 0.4220 WLBL200 In Stock $1.98232/EA EA
2 1/4 2.2620 3.2210 0.44 WLBL225 In Stock $2.12003/EA EA
2 1/2 2.5120 3.4710 0.44 WLBL250 In Stock $2.93542/EA EA