Specifications: All commercial and military tooth lockwashers supplied by WCL Company and listed on these pages conform to ASME B18.21.1 and to all applicable specifications as reported by IFI.
- For use with flat and oval head screws having either 80° or 100° countersunk angles.
- Where appearance or snagging are important considerations a version with a smooth external flange and internal teeth is available.
82° Countersunk – External Type
| Nominal Washer Size | Hole Dia. Min. | Hole Dia. Max. | Outside Dia. Min. | Outside Dia. Max. | Thickness | WCL Part Numbers | Cross Reference | MS35336-1 Steel Plated |
MS35336-1 Stainless Steel |
MS35336-1 Bronze Alloy |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 0.089 | 0.095 | 0.17 | 0.183 | 0.013 | CTSK-0086-00-00 | 1502-00 | |||
| 4 | 0.113 | 0.123 | 0.224 | 0.238 | 0.015 | CTSK-0112-00-00 | 1504-00 | -3 | -5 | -55 |
| 6 | 0.14 | 0.15 | 0.283 | 0.298 | 0.017 | CTSK-0138-00-00 | 1506-00 | -9 | -11 | -56 |
| 6 | 0.142 | 0.15 | 0.285 | 0.3 | 0.013 | CTSK-0138-02-00 | 1506-02 | |||
| 8 | 0.167 | 0.177 | 0.324 | 0.34 | 0.017 | CTSK-0164-00-00 | 1508-00 | -15 | -17 | -57 |
| 10 | 0.195 | 0.205 | 0.353 | 0.372 | 0.022 | CTSK-0190-00-00 | 1510-00 | -21 | -23 | -58 |
| 12 | 0.22 | 0.231 | 0.429 | 0.447 | 0.022 | CTSK-0216-00-00 | 1512-00 | |||
| 1/4 | 0.255 | 0.267 | 0.458 | 0.478 | 0.022 | CTSK-0250-00-00 | 1514-00 | -27 | -29 | -59 |
| 16 | 0.273 | 0.287 | 0.523 | 0.543 | 0.025 | CTSK-0281-00-00 | 1516-00 | |||
| 5/16 | 0.318 | 0.337 | 0.603 | 0.625 | 0.025 | CTSK-0312-00-00 | 1518-00 | -33 | -35 | -60 |
| 3/8 | 0.383 | 0.398 | 0.776 | 0.801 | 0.029 | CTSK-0375-00-00 | 1520-00 | -39 | -41 | -61 |
| 7/16 | 0.448 | 0.463 | 0.863 | 0.89 | 0.035 | CTSK-0437-00-00 | 1522-00 | |||
| 7/16 | 0.448 | 0.463 | 0.89 | 0.915 | 0.035 | CTSK-0437-02-00 | 1522-02 | |||
| 1/2 | 0.512 | 0.529 | 0.977 | 1.007 | 0.039 | CTSK-0500-00-00 | 1524-00 | -51 | -53 | -63 |
| 5/8 | 0.65 | 0.675 | REF. | 1.312 | 0.051 | CTSK-0625-00-00 | 1528-00 |
100° Countersunk – External Type
| Nominal Washer Size | Hole Dia. Min. | Hole Dia. Max. | Outside Dia. Min. | Outside Dia. Max. | Thickness | WCL Part Numbers | Cross Reference | MS35336-1 Steel Plated |
MS35336-1 Stainless Steel |
MS353361 Bronze Alloy |
|---|---|---|---|---|---|---|---|---|---|---|
| 8 | 0.168 | 0.176 | 0.324 | 0.34 | 0.015 | CTSK-0164-04-00 | 1508-04 | -9 | -123 | |
| 10 | 0.195 | 0.204 | 0.377 | 0.394 | 0.017 | CTSK-0190-05-00 | 1510-05 | -17 | -125 | |
| 1/4 | 0.256 | 0.267 | 0.473 | 0.493 | 0.022 | CTSK-0250-05-00 | 1514-05 | -25 | -127 |
82° Countersunk – Internal Flange Type
| Nominal Washer Size | Hole Dia. Min. | Hole Dia. Max. | Outside Dia. Min. | Outside Dia. Max. | Thickness | WCL Part Numbers | Cross Reference |
|---|---|---|---|---|---|---|---|
| 8 | 0.207 | 0.215 | 0.615 | 0.635 | 0.025 | CTSK-0164-07-00 | 1508-07 |
| 5/16 | 0.34 | 0.362 | 0.802 | 0.818 | 0.029 | CTSK-0312-04-00 | 1518-04* |
* For 1/4″ HD screw 1 WCL acquires countersunk washers from our Vendors, and tests to certify performance to MS35336 specifications. Due to manufacturing tolerances some parts do not conform to military specifications. Inquire with WCL sales staff for more information.
82° Countersunk – Internal Flange Type
| Screw Size | 4 | 5 | 6 | 8 | 10 | 12 | 1/4 | 5/16 | 3/8 |
|---|---|---|---|---|---|---|---|---|---|
| A | 1/8 | 5/32 | 11/64 | 13/64 | 15/64 | 1/4 | 9/32 | 23/64 | 27/64 |
| B | 9/32 | 5/16 | 11/32 | 25/64 | 29/64 | 33/64 | 37/64 | 45/64 | 27/32 |
| C | 0.09 | 0.095 | 0.1 | 0.11 | 0.125 | 0.155 | 0.165 | 0.2 | 0.245 |
Countersinking specifications to accommodate 82° flat and oval head screws with WCL Countersunk Lockwashers
Note: Dimensions are approximate.