Extra-Duty Helical Spring Spilt Lockwashers

MIL-SPEC EXTRA DUTY HELICAL SPRING SPLIT LOCKWASHERS

With a further increase in O.D., thickness and bearing area, the Mil-Spec Extra-Duty (Extra Heavy) helical spring spilt lock washer absorbs exceptionally high torques and retains tension under heavy loads. WCL also refers to these as Extra Heavy (EH).

Material Code Table

C/S = Carbon Steel
304 SS = Type 304 Stainless Steel
316 SS = Type 316 Stainless Steel
420 SS = Type 420 Stainless Steel
PHO = Phosphor Bronze
KM = K-Monel

Ordering Example:
MS35340-42 is a #8 Extra Duty, Carbon Steel, with a Mechanical Zinc & Yellow Dichromate finish.
#1/4 EH C/S L/W MZ1 is a 1/4 Extra Duty Carbon Steel Lockwasher with a Mechanical Zinc finish.

Finish Code Table

PLN = Plain
CD1 = Cadmium & Clear Dichromate
CD2 = Cadmium & Yellow Dichromate
CD3 = Cadmium & Black Dichromate
MZ1= Mechanical Zinc & Clear Dichromate
MZ2= Mechanical Zinc & Yellow Dichromate
ZN1 = Zinc & Clear Dichromate
ZN2 = Zinc & Yellow Dichromate
BKO = Black Oxide
PHO = Phosphate

						MS35340 Dash Numbers
Nominal	Inside Diameter		Outside	Width	Thickness	Steel
Washer	A		Diameter	C	D	Finish
Size	Min.	Max.	B			MZ2 or CD2
2	.088	.094	.208	.053	.027	39
4	.114	.120	.253	.062	.034	40
6	.141	.148	.314	.079	.045	41
8	.167	.174	.375	.096	.057	42
10	.193	.200	.434	.112	.068	43
1/4	.252	.260	.533	.132	.084	44
5/16	.314	.322	.619	.143	.108	45
3/8	.377	.385	.738	.170	.123	46
7/16	.440	.450	.836	.186	.143	47
1/2	.502	.512	.935	.204	.162	48
9/16	.564	.574	1.035	.223	.182	49
5/8	.628	.641	1.151	.242	.202	50
3/4	.753	.766	1.355	.279	.241	51
7/8	.878	.894	1.571	.322	.285	52
1	1.003	1.024	1.794	.366	.330	53
1-1/8	1.129	1.153	2.013	.411	.375	54
1-1/4	1.254	1.280	2.222	.452	.417	55
1-3/8	1.397	1.408	2.429	.491	.458	56
1-1/2	1.504	1.534	2.627	.526	.496	57

						12387272
Nominal	Inside Diameter		Outside	Width	Thickness	Dash Numbers
Washer	A		Diameter	C	D	Steel
Size	Min.	Max.	B			Zinc Yellow Finish
2	.088	.094	.208	.053	.027	39
4	.114	.120	.253	.062	.034	40
6	.141	.148	.314	.079	.045	41
8	.167	.174	.375	.096	.057	42
10	.193	.200	.434	.112	.068	43
1/4	.252	.260	.533	.132	.084	44
5/16	.314	.322	.619	.143	.108	45
3/8	.377	.385	.738	.170	.123	46
7/16	.440	.450	.836	.186	.143	47
1/2	.502	.512	.935	.204	.162	48
9/16	.564	.574	1.035	.223	.182	49
5/8	.628	.641	1.151	.242	.202	50
3/4	.753	.766	1.355	.279	.241	51
7/8	.878	.894	1.571	.322	.285	52
1	1.003	1.024	1.794	.366	.330	53
1-1/8	1.129	1.153	2.013	.411	.375	54
1-1/4	1.254	1.280	2.222	.452	.417	55
1-3/8	1.397	1.408	2.429	.491	.458	56
1-1/2	1.504	1.534	2.627	.526	.496	57