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.

Technical Data

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

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

All dimensions are in inches.

External Tooth Lock Washer, Plated

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Diameter	Inside Diameter	Outside Diameter	Thickness	Item #	Availability	Price	Quantity
#6	0.1410	0.3125	0.0160	WLEP 6	In Stock	$0.04318/EA	EA	EA
#8	0.1680	0.3750	0.0180	WLEP 8	In Stock	$0.04318/EA	EA	EA
#10	0.1950	0.4062	0.0180	WLEP 10	In Stock	$0.04318/EA	EA	EA
#12	0.2210	0.4688	0.02	WLEP 12	3-5 Working Days	$0.04318/EA	EA	EA
1/4	0.2560	0.5	0.0230	WLEP025	In Stock	$0.02985/EA	EA	EA
5/16	0.32	0.5938	0.0280	WLEP031	In Stock	$0.0322/EA	EA	EA
3/8	0.3840	0.6875	0.0320	WLEP037	In Stock	$0.07519/EA	EA	EA
7/16	0.4480	0.75	0.0320	WLEP043	3-5 Working Days	$0.11719/EA	EA	EA
1/2	0.5130	0.8750	0.0370	WLEP050	In Stock	$0.12112/EA	EA	EA
9/16	0.5760	0.9688	0.0370	WLEP056	3-5 Working Days	$0.12177/EA	EA	EA
5/8	0.6410	1.0625	0.0420	WLEP062	In Stock	$0.23035/EA	EA	EA
3/4	0.7690	1.25	0.0470	WLEP075	In Stock	$0.31329/EA	EA	EA
7/8	0.8970	1.3750	0.0520	WLEP087	In Stock	$0.53135/EA	EA	EA
1	1.0250	1.5938	0.0590	WLEP100	3-5 Working Days	$0.55236/EA	EA	EA

External Tooth Lock Washer, Plated

Technical Data

Tab 1

Governing StandardsExternal Tooth Lock Washer

Tab 4

Dimensional SpecificationsExternal Tooth Lock Washer

Product Specification

Grade

Diameter

Thickness

Outside Diameter

Inside Diameter