18-8 SS Split Lock Washer

18-8 Stainless Steel split lock washers are used under bolt heads or nuts to increase the hold of the fastener or to increase the bearing surface. Split lock washers are helical-shaped split rings. When fastened, the two ends exert a spring force on the fastener to create increased friction and resistance to motion. Dimensional specifications are governed by ASME B18.21.1. 18-8 stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment.

Technical Data

Governing StandardsSplit 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 SpecificationsSplit Lock Washer

Per ASME B18.21.1-2009
Size	Nominal	A		B	T	W	BW
		Inside Diameter		Outside Diameter	Mean Section Thickness	Section Width	Bearing Width
		Max	Min	Max	Min	Min	Min
#2	0.0860	0.0940	0.0880	0.1720	0.0200	0.0350	0.0240
#3	0.0990	0.1070	0.1010	0.1950	0.0250	0.0400	0.0280
#4	0.1120	0.1200	0.1140	0.2090	0.0250	0.0400	0.0280
#5	0.1250	0.1330	0.1270	0.2360	0.0310	0.0470	0.0330
#6	0.1380	0.1480	0.1410	0.2500	0.0310	0.0470	0.0330
#8	0.1640	0.1740	0.1670	0.2930	0.0400	0.0550	0.0380
#10	0.1900	0.2000	0.1930	0.3340	0.0470	0.0620	0.0430
#12	0.2160	0.2270	0.2200	0.3770	0.0560	0.0700	0.0490
1/4	0.2500	0.2600	0.2520	0.4870	0.0620	0.1090	0.0760
5/16	0.3125	0.3220	0.3140	0.5830	0.0780	0.1250	0.0870
3/8	0.3750	0.3850	0.3770	0.6800	0.0940	0.1410	0.0990
7/16	0.4375	0.4500	0.4400	0.7760	0.1090	0.1560	0.1090
1/2	0.5000	0.5120	0.5020	0.8690	0.1250	0.1710	0.1200
9/16	0.5625	0.5740	0.5640	0.9650	0.1410	0.1880	0.1320
5/8	0.6250	0.6410	0.6280	1.0730	0.1560	0.2090	0.1420
3/4	0.7500	0.7660	0.7530	1.2650	0.1880	0.2340	0.1640
7/8	0.8750	0.8940	0.8780	1.4590	0.2190	0.2660	0.1860
1	1.0000	1.0240	1.0030	1.6560	0.2500	0.2970	0.2080
1 1/8	1.1250	1.1530	1.1290	1.8470	0.2810	0.3280	0.2300
1 1/4	1.2500	1.2800	1.2540	2.0360	0.3120	0.3590	0.2510
1 3/8	1.3750	1.4080	1.3790	2.2190	0.3440	0.3910	0.2740
1 1/2	1.5000	1.5340	1.5040	2.4190	0.3750	0.4220	0.2950

All dimensions are in inches.

18-8 SS Split Lock Washer

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Diameter	Inside Diameter	Outside Diameter	Thickness	Item #	Availability	Price	Quantity
#4	0.1140	0.2090	0.0250	WLS4 4	In Stock	$0.01206/EA	EA	EA
#6	0.1410	0.25	0.0310	WLS4 6	In Stock	$0.01259/EA	EA	EA
#8	0.1670	0.2930	0.04	WLS4 8	In Stock	$0.01921/EA	EA	EA
#10	0.1930	0.3340	0.0470	WLS4 10	In Stock	$0.05129/EA	EA	EA
#12	0.22	0.3770	0.0560	WLS4 12	In Stock	$0.04095/EA	EA	EA
1/4	0.2520	0.4870	0.0620	WLS4025	In Stock	$0.02848/EA	EA	EA
5/16	0.3140	0.5830	0.0780	WLS4031	In Stock	$0.05218/EA	EA	EA
3/8	0.3770	0.68	0.0940	WLS4037	In Stock	$0.07499/EA	EA	EA
7/16	0.44	0.7760	0.1090	WLS4043	In Stock	$0.14248/EA	EA	EA
1/2	0.5020	0.8690	0.1250	WLS4050	In Stock	$0.12479/EA	EA	EA
9/16	0.5640	0.9650	0.1410	WLS4056	In Stock	$0.43731/EA	EA	EA
5/8	0.6280	1.0730	0.1560	WLS4062	In Stock	$0.21059/EA	EA	EA
3/4	0.7530	1.2650	0.1880	WLS4075	In Stock	$0.39601/EA	EA	EA
7/8	0.8780	1.4590	0.2190	WLS4087	In Stock	$0.7189/EA	EA	EA
1	1.0030	1.6560	0.25	WLS4100	In Stock	$1.05255/EA	EA	EA
1 1/8	1.1290	1.8470	0.2810	WLS4112	In Stock	$2.40437/EA	EA	EA
1 1/4	1.2540	2.0360	0.3120	WLS4125	In Stock	$2.48685/EA	EA	EA
1 3/8	1.3790	2.2190	0.3440	WLS4137	In Stock	$7.04288/EA	EA	EA
1 1/2	1.5040	2.4190	0.3750	WLS4150	In Stock	$6.06803/EA	EA	EA

18-8 SS Split Lock Washer

Technical Data

Tab 1

Governing StandardsSplit Lock Washer

Tab 4

Dimensional SpecificationsSplit Lock Washer

Product Specification

Grade

Diameter

Thickness

Outside Diameter

Inside Diameter