18-8 SS Split Lock Washer
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18-8 SS Split Lock Washer

18-8 Stainless Steel 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. 18-8 stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment.

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. All dimensions are in inches.
18-8 SS Split Lock Washer
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#4 0.1140 0.2090 0.0250 WLS4 4 In Stock $0.01206/EA EA
#6 0.1410 0.25 0.0310 WLS4 6 In Stock $0.01255/EA EA
#8 0.1670 0.2930 0.04 WLS4 8 In Stock $0.01839/EA EA
#10 0.1930 0.3340 0.0470 WLS4 10 In Stock $0.05121/EA EA
#12 0.22 0.3770 0.0560 WLS4 12 In Stock $0.04095/EA EA
1/4 0.2520 0.4870 0.0620 WLS4025 In Stock $0.04177/EA EA
5/16 0.3140 0.5830 0.0780 WLS4031 In Stock $0.07097/EA EA
3/8 0.3770 0.68 0.0940 WLS4037 In Stock $0.09841/EA EA
7/16 0.44 0.7760 0.1090 WLS4043 In Stock $0.14406/EA EA
1/2 0.5020 0.8690 0.1250 WLS4050 In Stock $0.12479/EA EA
9/16 0.5640 0.9650 0.1410 WLS4056 In Stock $0.43731/EA EA
5/8 0.6280 1.0730 0.1560 WLS4062 In Stock $0.32255/EA EA
3/4 0.7530 1.2650 0.1880 WLS4075 In Stock $0.39607/EA EA
7/8 0.8780 1.4590 0.2190 WLS4087 In Stock $0.7089/EA EA
1 1.0030 1.6560 0.25 WLS4100 In Stock $1.02814/EA EA
1 1/8 1.1290 1.8470 0.2810 WLS4112 In Stock $2.66027/EA EA
1 1/4 1.2540 2.0360 0.3120 WLS4125 In Stock $3.2238/EA EA
1 3/8 1.3790 2.2190 0.3440 WLS4137 In Stock $7.04288/EA EA
1 1/2 1.5040 2.4190 0.3750 WLS4150 In Stock $6.06803/EA EA