External Tooth Lock Washer, Plated
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External Tooth Lock Washer, Plated

Low carbon external tooth lock washers are used under bolt heads or nuts to increase the hold of the fastener. 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. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

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.
External Tooth Lock Washer, Plated
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#6 0.1410 0.3125 0.0160 WLEP 6 In Stock $0.04318/EA EA
#8 0.1680 0.3750 0.0180 WLEP 8 In Stock $0.04318/EA EA
#10 0.1950 0.4062 0.0180 WLEP 10 In Stock $0.04318/EA EA
#12 0.2210 0.4688 0.02 WLEP 12 3-5 Working Days $0.04318/EA EA
1/4 0.2560 0.5 0.0230 WLEP025 In Stock $0.02985/EA EA
5/16 0.32 0.5938 0.0280 WLEP031 In Stock $0.0322/EA EA
3/8 0.3840 0.6875 0.0320 WLEP037 In Stock $0.08325/EA EA
7/16 0.4480 0.75 0.0320 WLEP043 3-5 Working Days $0.11719/EA EA
1/2 0.5130 0.8750 0.0370 WLEP050 In Stock $0.12112/EA EA
9/16 0.5760 0.9688 0.0370 WLEP056 3-5 Working Days $0.12177/EA EA
5/8 0.6410 1.0625 0.0420 WLEP062 In Stock $0.23035/EA EA
3/4 0.7690 1.25 0.0470 WLEP075 In Stock $0.31329/EA EA
7/8 0.8970 1.3750 0.0520 WLEP087 In Stock $0.53135/EA EA
1 1.0250 1.5938 0.0590 WLEP100 3-5 Working Days $0.55236/EA EA