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.

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.

SS External Tooth Lock Washer

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Diameter	Inside Diameter	Outside Diameter	Thickness	Item #	Availability	Price	Quantity
#4	0.1410	0.3125	0.0160	WLES 4	In Stock	$0.01103/EA	EA	EA
#8	0.1680	0.3750	0.0180	WLES 6	In Stock	$0.01226/EA	EA	EA
#10	0.1950	0.4062	0.0180	WLES 8	In Stock	$0.06661/EA	EA	EA
#12	0.2210	0.4688	0.02	WLES 10	In Stock	$0.08329/EA	EA	EA
1/4	0.2560	0.5	0.0230	WLES025	In Stock	$0.03801/EA	EA	EA
5/16	0.32	0.5938	0.0280	WLES031	In Stock	$0.03676/EA	EA	EA
3/8	0.3840	0.6875	0.0320	WLES037	In Stock	$0.08514/EA	EA	EA
1/2	0.5130	0.96	0.0320	WLES050	In Stock	$0.16749/EA	EA	EA
5/8	0.6410	1.0450	0.0420	WLES062	In Stock	$0.30843/EA	EA	EA

SS External Tooth Lock Washer

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