SS External Tooth Lock Washer
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SS External Tooth Lock Washer

Stainless Steel external tooth lock washers are used under bolt heads or nuts to increase the hold of the fastener. They can be manufactured of 18-8 or 400 series stainless steel. External tooth lock washers have teeth on the outer dimension of the washer creating a ratchet action by biting into the nut or screw head and the surface it contacts. Dimensional specifications are governed by ASME B18.21.1. Stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment.

Governing StandardsExternal Tooth 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 SpecificationsExternal Tooth Lock Washer

External Tooth Lock Washer dimensions
Per ASME B18.21.1-2009
Size Nominal A B C
Inside
Diameter
Outside
Diameter
Mean Section
Thickness
Max Min Max Min Max Min
#3 0.0990 0.1090 0.1020 0.2350 0.2200 0.0160 0.0100
#4 0.1120 0.1230 0.1150 0.2600 0.2450 0.0180 0.0120
#5 0.1250 0.1360 0.1290 0.2850 0.2700 0.0200 0.0140
#6 0.1380 0.1500 0.1410 0.3200 0.3050 0.0220 0.0160
#8 0.1640 0.1760 0.1680 0.3810 0.3650 0.0230 0.0180
#10 0.1900 0.2040 0.1950 0.4100 0.3950 0.0240 0.0180
#12 0.2160 0.2310 0.2210 0.4750 0.4600 0.0270 0.0200
1/4 0.2500 0.2670 0.2560 0.5100 0.4940 0.0280 0.0230
5/16 0.3125 0.3320 0.3200 0.6100 0.5880 0.0340 0.0280
3/8 0.3750 0.3980 0.3840 0.6940 0.6700 0.0400 0.0320
7/16 0.4375 0.4640 0.4480 0.7600 0.7400 0.0400 0.0320
1/2 0.5000 0.5300 0.5130 0.9000 0.8800 0.0450 0.0370
9/16 0.5625 0.5960 0.5760 0.9850 0.9600 0.0450 0.0370
5/8 0.6250 0.6630 0.6410 1.0700 1.0450 0.0500 0.0420
3/4 0.7500 0.7950 0.7680 1.2600 1.2200 0.0550 0.0470
7/8 0.8750 0.9270 0.8970 1.4100 1.3800 0.0600 0.0520
1 1.0000 1.0600 1.0250 1.6200 1.5900 0.0670 0.0590
  1. All dimensions are in inches.
SS External Tooth Lock Washer
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#4 0.1410 0.3125 0.0160 WLES 4 In Stock $0.01103/EA EA
#8 0.1680 0.3750 0.0180 WLES 6 In Stock $0.01226/EA EA
#10 0.1950 0.4062 0.0180 WLES 8 In Stock $0.06661/EA EA
#12 0.2210 0.4688 0.02 WLES 10 In Stock $0.08329/EA EA
1/4 0.2560 0.5 0.0230 WLES025 In Stock $0.05905/EA EA
5/16 0.32 0.5938 0.0280 WLES031 In Stock $0.03676/EA EA
3/8 0.3840 0.6875 0.0320 WLES037 In Stock $0.08514/EA EA
1/2 0.5130 0.96 0.0320 WLES050 In Stock $0.16749/EA EA
5/8 0.6410 1.0450 0.0420 WLES062 In Stock $0.30843/EA EA