With a further increase in O.D., thickness and bearing area, the 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).
We also have Mil-Spec Extra-Duty (Extra Heavy) Helical Spring Spilt Lockwashers.
| Material |
| 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 |
| PLN = Plain CD1 = Cadmium & Clear Dichromate CD2 = Cadmium & Yellow Dichromate CD3 = Cadmium & Black Chromate MZ1= Mechanical Zinc & Clear Dichromate MZ2= Mechanical Zinc & Yellow Dichromate ZN1 = Zinc & Clear Dichromate ZN2 = Zinc & Yellow Dichromate BKO = Black Oxide PHO = Phosphate HDG = Hot Dip Galvanized MG = Mechanical Galvanized |
| Nominal Washer Size |
Inside Diameter A Min. |
Inside Diameter A Max. |
Outside Diameter B |
Width C |
Thickness D |
WCL Steel Product Number |
WCL Stainless Product Number |
WCL Bronze Product Number |
|---|---|---|---|---|---|---|---|---|
| 2 | .088 | .094 | .208 | .053 | .027 | #2-EX-HVY-C/S | #2-EX-HVY-SS | #2-EX-HVY-BRZ |
| 3 | .101 | .107 | .239 | .062 | .034 | #3-EX-HVY-C/S | #3-EX-HVY-SS | #3-EX-HVY-BRZ |
| 4 | .114 | .120 | .253 | .062 | .034 | #4-EX-HVY-C/S | #4-EX-HVY-SS | #4-EX-HVY-BRZ |
| 5 | .127 | .133 | .300 | .079 | .045 | #5-EX-HVY-C/S | #5-EX-HVY-SS | #5-EX-HVY-BRZ |
| 6 | .141 | .148 | .314 | .079 | .045 | #6-EX-HVY-C/S | #6-EX-HVY-SS | #6-EX-HVY-BRZ |
| 8 | .167 | .174 | .375 | .096 | .057 | #8-EX-HVY-C/S | #8-EX-HVY-SS | #8-EX-HVY-BRZ |
| 10 | .193 | .200 | .434 | .112 | .068 | #10-EX-HVY-C/S | #10-EX-HVY-SS | #10-EX-HVY-BRZ |
| 12 | .220 | .227 | .497 | .130 | .080 | #12-EX-HVY-C/S | #12-EX-HVY-SS | #12-EX-HVY-BRZ |
| 1/4 | .252 | .260 | .533 | .132 | .084 | 1/4-EX-HVY-C/S | 1/4-EX-HVY-SS | 1/4-EX-HVY-BRZ |
| 5/16 | .314 | .322 | .619 | .143 | .108 | 5/16-EX-HVY-C/S | 5/16-EX-HVY-SS | 5/16-EX-HVY-BRZ |
| 3/8 | .377 | .385 | .738 | .170 | .123 | 3/8-EX-HVY-C/S | 3/8-EX-HVY-SS | 3/8-EX-HVY-BRZ |
| 7/16 | .440 | .450 | .836 | .186 | .143 | 7/16-EX-HVY-C/S | 7/16-EX-HVY-SS | 7/16-EX-HVY-BRZ |
| 1/2 | .502 | .512 | .935 | .204 | .162 | 1/2-EX-HVY-C/S | 1/2-EX-HVY-SS | 1/2-EX-HVY-BRZ |
| 9/16 | .564 | .574 | 1.035 | .223 | .182 | 9/16-EX-HVY-C/S | 9/16-EX-HVY-SS | 9/16-EX-HVY-BRZ |
| 5/8 | .628 | .641 | 1.151 | .242 | .202 | 5/8-EX-HVY-C/S | 5/8-EX-HVY-SS | 5/8-EX-HVY-BRZ |
| 3/4 | .753 | .766 | 1.355 | .279 | .241 | 3/4-EX-HVY-C/S | 3/4-EX-HVY-SS | 3/4-EX-HVY-BRZ |
| 7/8 | .878 | .894 | 1.571 | .322 | .285 | 7/8-EX-HVY-C/S | 7/8-EX-HVY-SS | 7/8-EX-HVY-BRZ |
| 1 | 1.003 | 1.024 | 1.794 | .366 | .330 | 1-EX-HVY-C/S | 1-EX-HVY-SS | 1-EX-HVY-BRZ |
| 1-1/8 | 1.129 | 1.153 | 2.013 | .411 | .375 | 1-1/8-EX-HVY-C/S | 1-1/8-EX-HVY-SS | 1-1/8-EX-HVY-BRZ |
| 1-1/4 | 1.254 | 1.280 | 2.222 | .452 | .417 | 1-1/4-EX-HVY-C/S | 1-1/4-EX-HVY-SS | 1-1/4-EX-HVY-BRZ |
| 1-3/8 | 1.397 | 1.408 | 2.429 | .491 | .458 | 1-3/8-EX-HVY-C/S | 1-3/8-EX-HVY-SS | 1-3/8-EX-HVY-BRZ |
| 1-1/2 | 1.504 | 1.534 | 2.627 | .526 | .496 | 1-1/2-EX-HVY-C/S | 1-1/2-EX-HVY-SS | 1-1/2-EX-HVY-BRZ |
| 1-5/8 | 1.633 | 1.663 | 2.784 | .526 | .496 | 1-5/8-EX-HVY-C/S | 1-5/8-EX-HVY-SS | 1-5/8-EX-HVY-BRZ |
| 1-3/4 | 1.758 | 1.789 | 2.902 | .532 | .526 | 1-3/4-EX-HVY-C/S | 1-3/4-EX-HVY-SS | 1-3/4-EX-HVY-BRZ |
| 1-7/8 | 1.883 | 1.914 | 3.027 | .532 | .526 | 1-7/8-EX-HVY-C/S | 1-7/8-EX-HVY-SS | 1-7/8-EX-HVY-BRZ |
| 2 | 2.008 | 2.039 | 3.156 | .532 | .526 | 2-EX-HVY-C/S | 2-EX-HVY-SS | 2-EX-HVY-BRZ |