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82° COUNTERSUNK - EXTERNAL TYPE Mil-Spec
Nominal Inside Outside Nominal MS35336
Screw Diameter Diameter Material Steel Stainless Alloy
Size Min. Max. Min. Max. Thickness Plated Steel Bronze
 4   0.113 0.123 0.224 0.238 0.015  -3    -5    -55  
 6   0.140 0.150 0.283 0.298 0.017  -9    -11    -56  
 8   0.167 0.177 0.324 0.340 0.017  -15    -17    -57  
 10   0.195 0.205 0.353 0.372 0.022  -21    -23    -58  
 1/4   0.255 0.267 0.458 0.478 0.022  -27    -29    -59  
 5/16   0.318 0.337 0.603 0.625 0.025  -33    -35    -60  
 3/8   0.383 0.396 0.776 0.801 0.029  -39    -41    -61  
 1/2   0.512 0.529 0.977  1.007   0.039  -51    -53    -63  

100 * COUNTERSUNK - EXTERNAL TYPE Mil-Spec
Nominal Inside Outside Material MS35790
Screw Diameter Diameter Thickness Steel Stainless Alloy
Size Min. Max. Min. Max. Min. Max. Plated Steel Bronze
2 0.089 0.095 0.177 0.193 0.006 0.014 -101 --- -117
4 0.113 0.123 0.265 0.280 0.013 0.019 -109 --- -119
6 0.140 0.150 0.271 0.319 0.011 0.021 -1 --- -121
8 0.167 0.177 0.324 0.360 0.013 0.021  -9   ---  -123  
10 0.195 0.205 0.377 0.394 0.015 0.025  -17   ---  -125  
1/4 0.255 0.267 0.473 0.493 0.020 0.025  -25   ---  -127  
5/16 0.318 0.333 0.631 0.653 0.023 0.028 -33 --- -129
3/8 0.383 0.398 0.825 0.850 0.028 0.034 -41 --- -131


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     .090     .095     .100   .110   .125   .155   .165    .200   .245  
Note: Dimensions are approximate.
Countersinking specifications to accommodate 82° flat and oval head screws with WCL Countersunk Lockwashers
WCL Company • 16730 East Johnson Dr. • P.O. Box 3588 • Industry, CA 91744
Tel (626) 968-5523 • Fax (626) 369-9805 • We are Open 7am - 4:30pm, Pacific
WCL Company specializes in reliable low-cost, engineered high-performance fasteners, fittings, plastic components, washers, nuts, and a wide array of fastener components. WCL has 50 years of experience with all types of standard and engineered fasteners, and provides a comprehensive line of fastener products for sale from some of the world's leading manufacturers.
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