Internal Tooth Lock Washer, Plated
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Internal Tooth Lock Washer, Plated

Low carbon internal tooth lock washers are used under bolt heads or nuts to increase the hold of the fastener. Internal tooth lock washers have teeth on the inner 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 StandardsInternal 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 SpecificationsInternal Tooth Lock Washer

Split Lock Washer dimensions
Per ASME B18.21.1-2009
Size Nominal Inside
Diameter
Outside
Diameter
Mean Section
Thickness
Max Min Max Min Max Min
#2 0.0860 0.0950 0.0890 0.2000 0.1750 0.0160 0.0100
#3 0.0990 0.1090 0.1020 0.2320 0.2150 0.0160 0.0100
#4 0.1120 0.1230 0.1150 0.2700 0.2450 0.0180 0.0120
#5 0.1250 0.1360 0.1290 0.2800 0.2550 0.0200 0.0140
#6 0.1380 0.1500 0.1410 0.2950 0.2750 0.0220 0.0160
#8 0.1640 0.1760 0.1680 0.3400 0.3250 0.0230 0.0180
#10 0.1900 0.2040 0.1950 0.3810 0.3650 0.0240 0.0180
#12 0.2160 0.2310 0.2210 0.4100 0.3940 0.0270 0.0200
1/4 0.2500 0.2670 0.2560 0.4780 0.4600 0.0280 0.0230
5/16 0.3125 0.3320 0.3200 0.6100 0.5940 0.0340 0.0280
3/8 0.3750 0.3980 0.3840 0.6920 0.6700 0.0400 0.0320
7/16 0.4375 0.4640 0.4480 0.7890 0.7400 0.0400 0.0320
1/2 0.5000 0.5300 0.5120 0.9000 0.8670 0.0450 0.0370
9/16 0.5625 0.5960 0.5760 0.9850 0.9570 0.0450 0.0370
5/8 0.6250 0.6630 0.6400 1.0710 1.0450 0.0500 0.0420
3/4 0.7500 0.7950 0.7690 1.2450 1.2200 0.0550 0.0470
7/8 0.8750 0.9270 0.8940 1.4100 1.3640 0.0600 0.0520
1 1.0000 1.0600 1.0190 1.6370 1.5900 0.0670 0.0590
  1. All dimensions are in inches.
Internal Tooth Lock Washer, Plated
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#6 0.1410 0.2812 0.0160 WLIP 6 In Stock $0.04318/EA EA
#8 0.1680 0.3281 0.0180 WLIP 8 3-5 Working Days $0.04318/EA EA
#10 0.1950 0.3750 0.0180 WLIP 10 In Stock $0.07712/EA EA
1/4 0.2560 0.4688 0.0230 WLIP025 In Stock $0.028/EA EA
5/16 0.32 0.5938 0.0280 WLIP031 In Stock $0.09007/EA EA
3/8 0.3840 0.6875 0.0320 WLIP037 In Stock $0.06865/EA EA
7/16 0.4480 0.75 0.0320 WLIP043 In Stock $0.09629/EA EA
1/2 0.5120 0.8750 0.0370 WLIP050 In Stock $0.15384/EA EA
9/16 0.5760 0.9688 0.0370 WLIP056 3-5 Working Days $0.14931/EA EA
5/8 0.6410 1.0625 0.0420 WLIP062 In Stock $0.16741/EA EA
3/4 0.7690 1.2344 0.0470 WLIP075 In Stock $0.1898/EA EA
7/8 0.8970 1.3750 0.0520 WLIP087 In Stock $0.13709/EA EA
1 1.0250 1.5938 0.0590 WLIP100 In Stock $0.38248/EA EA