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Nominal Hole Outside Nominal WCL
Screw Diameter Diameter Material Product
Size Min. Max. Min. Max. Thickness Plain Steel
  2     0.089     0.095     0.275     0.285     0.017     EXT-0086-01-00
             
  3     0.102     0.109     0.220     0.230     0.013     EXT-0099-00-00
             
  4   0.116   0.123     0.245   0.255   0.015     EXT-0112-00-00
  4     0.116     0.123     0.275     0.285     0.015     EXT-0112-01-00
  4     0.116     0.123     0.215     0.225     0.015     EXT-0112-02-00
4 0.116 0.123 0.245 0.255 0.012 EXT-0112-03-00
4 0.116 0.123 0.370 0.381 0.015 EXT-0112-04-00
4 0.113 0.123 0.245 0.255 0.015 EXT-0112-05-00
             
  5     0.129     0.136     0.270     0.280     0.015     EXT-0125-00-00
5 0.129 0.136 0.240 0.248 0.017 EXT-0125-03-00
5 0.129 0.136 0.270 0.280 0.010 EXT-0125-04-00
             
  6   0.142   0.150   0.306 0.317   0.020     EXT-0138-00-00
  6     0.142     0.150     0.370     0.381     0.022     EXT-0138-01-00
6 0.141 0.147 0.270 0.278 0.017 EXT-0138-02-00
  6   0.142 0.150   0.306     0.317     0.017     EXT-0138-05-00
6 0.142 0.150 0.306 0.317 0.020 EXT-0138-06-00
6 0.142 0.150 0.494 0.506 0.008 EXT-0138-07-00
             
  8     0.168     0.176   0.370   0.381     0.020     EXT-0164-00-00
  8     0.168     0.176     0.370     0.381     0.025     EXT-0164-01-00
  8     0.168     0.176     0.680     0.695     0.039     EXT-0164-02-00
8 0.168 0.176 0.395 0.406 0.018 EXT-0164-03-00
  8     0.168     0.176     0.494     0.506     0.020     EXT-0164-05-00
  8     0.168     0.176   0.345 0.355   0.022     EXT-0164-08-00
  8     0.165     0.170     0.306     0.317     0.020     EXT-0164-11-00
8 0.166 0.169 0.370 0.381 0.020 EXT-0164-12-00
8 0.166 0.169 0.567 0.580 0.029 EXT-0164-13-00 **
             
9 0.181 0.183 0.395 0.406 0.022 EXT-0184-01-00
             
  10     0.195     0.204     0.395   0.406   0.022     EXT-0190-00-00
  10     0.195     0.199     0.335     0.345     0.017     EXT-0190-03-00
  10     0.195     0.204     0.395     0.406     0.029     EXT-0190-04-00
10 0.202 0.210 0.375 0.385 0.022 EXT-0190-06-00
  10     0.195     0.204     0.494     0.506     0.025     EXT-0190-07-00
             
  12     0.221     0.231   0.462 0.474   0.025     EXT-0216-00-00
12 0.221 0.231 0.680 0.695 0.040 EXT-0216-01-00
12 0.218 0.224 0.395 0.406 0.022 EXT-0216-03-00
12 0.218 0.224 0.396 0.408 0.022 EXT-0216-05-00
             
  1/4     0.256     0.267     0.494   0.506   0.025     EXT-0250-00-00
  1/4     0.257     0.263     0.428     0.440     0.017     EXT-0250-02-00
  1/4     0.256     0.267     0.882     0.898     0.045     EXT-0250-04-00
  1/4     0.256     0.267     0.365     0.375     0.020     EXT-0250-05-00
1/4 0.250 0.256 0.740 0.760 0.022 EXT-0250-08-00
  1/4     0.256     0.267     0.680     0.695     0.039     EXT-0250-09-00
1/4 0.256 0.267 1.240 1.260 0.050 EXT-0250-10-00
  1/4   0.246 0.250   0.365     0.375     0.017     EXT-0250-11-00
1/4 0.256 0.267 0.588 0.601 0.029 EXT-0250-12-00
1/4 0.265 0.270 0.494 0.506 0.025 EXT-0250-13-00
1/4 0.256 0.267 0.640 0.654 0.030 EXT-0250-14-00 *
1/4 0.256 0.267 0.640 0.654 0.029 EXT-0250-15-00
  1/4     0.256     0.267     0.882     0.898     0.039     EXT-0250-16-00
1/4 0.246 0.250 0.882 0.898 0.045 EXT-0250-17-00
  1/4     0.256     0.267     0.365     0.375     0.029     EXT-0250-18-00
1/4 0.256 0.267 0.680 0.695 0.039 EXT-0250-19-00
1/4 0.256 0.267 0.740 0.760 0.035 EXT-0250-21-00
             
16 0.281 0.285 0.494 0.506 0.025 EXT-0281-01-00
             
  5/16     0.320   0.326   0.588   0.601   0.029     EXT-0312-00-00
  5/16     0.320     0.332     0.680     0.695     0.035     EXT-0312-02-00
5/16 0.320 0.326 0.588 0.601 0.015 EXT-0312-07-00
5/16 0.313 0.317 0.494 0.506 0.020 EXT-0312-08-00
5/16 0.320 0.326 0.588 0.601 0.029 EXT-0312-09-00 *
  5/16     0.353     0.357     0.640     0.654     0.035     EXT-0312-11-00
5/16 0.339 0.343 0.740 0.760 0.035 EXT-0312-12-00
5/16 0.316 0.319 0.588 0.601 0.029 EXT-0312-13-00
5/16 0.315 0.332 0.494 0.506 0.029 EXT-0312-14-00
             
  3/8     0.384     0.398   0.680 0.695   0.035     EXT-0375-00-00
  1/8 Pipe     0.406     0.420     0.680     0.695     0.035     EXT-0375-01-00
3/8 0.384 0.398 1.240 1.260 0.050 EXT-0375-02-00
  3/8     0.384     0.398   0.882   0.898     0.039     EXT-0375-06-00
  3/8     0.384     0.398     0.615     0.635     0.035     EXT-0375-08-00
  3/8     0.384     0.398     1.240     1.260     0.035     EXT-0375-09-00
3/8 0.384 0.398 0.680 0.694 0.035 EXT-0375-10-00 *
3/8 0.384 0.398 0.615 0.625 0.035 EXT-0375-11-00
  3/8     0.380     0.387     0.550     0.562     0.015     EXT-0375-12-00
3/8 0.384 0.398 0.615 0.635 0.015 EXT-0375-13-00
             
  7/16     0.448   0.463   0.740     0.760     0.035     EXT-0437-00-00
7/16 0.448 0.464 0.700 0.715 0.035 EXT-0437-04-00
7/16 0.448 0.463 1.590 1.620 0.030 EXT-0437-05-00
7/16 0.448 0.463 0.740 0.760 0.046 EXT-0437-06-00
7/16 0.448 0.463 0.740 0.760 0.035 EXT-0437-07-00 *
7/16 0.448 0.464 0.700 0.715 0.022 EXT-0437-08-00
  7/16     0.468     0.488     0.740     0.760     0.035     EXT-0437-09-00
7/16 0.454 0.458 0.882 0.898 0.039 EXT-0437-11-00
  7/16 0.448 0.463 0.740 0.750 0.035 EXT-0437-12-00
             
  1/2   0.512 0.529   0.882   0.898   0.039     EXT-0500-00-00
  1/2     0.512     0.529     1.380     1.410     0.055     EXT-0500-01-00
1/2 0.512 0.529 0.882 0.898 0.015 EXT-0500-02-00
1/2 0.512 0.529 1.590 1.620 0.045 EXT-0500-03-00
  1/2     0.512     0.529     0.882     0.898     0.050     EXT-0500-06-00
1/2 0.529 0.539 0.965 0.985 0.040 EXT-0500-09-00
1/2 0.513 0.530 0.802 0.807 0.015 EXT-0500-10-00
1/2 0.497 0.513 0.700 0.715 0.022 EXT-0500-11-00
1/2 0.526 0.536 1.045 1.070 0.045 EXT-0500-12-00
1/2 0.526 0.536 1.739 1.761 0.055 EXT-0500-13-00 †
             
  9/16     0.576   0.594 0.965   0.985     0.039     EXT-0562-00-00
9/16 0.576 0.594 0.868 0.883 0.039 EXT-0562-02-00
9/16 0.576 0.594 0.965 0.985 0.040 EXT-0562-04-00 *
             
  5/8   0.640 0.659   1.045     1.070     0.045     EXT-0625-00-00
5/8 0.640 0.659 1.240 1.260 0.062 EXT-0625-04-00
5/8 0.640 0.659 1.240 1.260 0.040 EXT-0625-05-00
  5/8     0.625     0.635     0.839     0.849     0.035     EXT-0625-06-00
5/8 0.641 0.663 1.045 1.070 0.045 EXT-0625-07-00 *
5/8 0.640 0.659 1.590 1.620 0.045 EXT-0625-08-00
             
11/16 0.735 0.765 1.380 1.410 0.035 EXT-0687-02-00
11/16 0.704 0.725 1.045 1.070 0.045 EXT-0687-03-00
11/16 0.704 0.725 1.130 1.155 0.045 EXT-0687-04-00
  11/16     0.690     0.696     0.914     0.922     0.035     EXT-0687-05-00
             
  3/4     0.768     0.790 1.240   1.260     0.050     EXT-0750-00-00
3/4 0.768 0.790 1.590 1.620 0.062 EXT-0750-07-00
3/4 0.770 0.790 3.960 4.000 0.078 EXT-0750-08-00  †
3/4 0.768 0.790 1.240 1.260 0.050 EXT-0750-09-00 *
             
  7/8     0.897     0.927     1.380     1.410     0.055     EXT-0875-00-00
7/8 0.897 0.927 1.380 1.410 0.035 EXT-0875-01-00
7/8 0.897 0.927 1.380 1.410 0.055 EXT-0875-02-00 *
7/8 0.894 0.918 1.739 1.761 0.055 EXT-0875-03-00 † 
7/8 0.897 0.927 1.380 1.410 0.055 EXT-0875-04-00
             
  1     1.025     1.060     1.590     1.620     0.062     EXT-1000-00-00
1 1.052 1.072 1.610 1.640 0.022 EXT-1000-01-00 † 
1 1.019 1.043 1.988 2.012 0.062 EXT-1000-03-00 † 
1 1.019 1.043 1.928 1.948 0.062 EXT-1000-05-00 † 
             
1 1/8 1.128 1.142 1.797 1.827 0.040 EXT-1125-01-00
1 1/8 1.128 1.142 2.172 2.202 0.040 EXT-1125-02-00
  1-1/8     1.128     1.142     1.797     1.827     0.062     EXT-1125-03-00
             
  1-1/4     1.269     1.293     2.172     2.202     0.062     EXT-1250-01-00
1 1/4 1.269 1.293 2.486 2.514 0.062 EXT-1250-02-00 † 
1 1/4 1.269 1.293 1.928 1.948 0.062 EXT-1250-03-00 † 
             
1 3/8 1.394 1.418 2.359 2.392 0.094 EXT-1375-01-00 ***
1 3/8 1.394 1.418 2.359 2.392 0.094 EXT-1375-02-00 ***
1 3/8 1.375 1.390 1.860 1.890 0.035 EXT-1375-03-00
             
1 9/16   1.560     1.580     2.359     2.392     0.094     EXT-1562-01-00
1 9/16 1.560 1.580 2.359 2.392 0.094 EXT-1562-02-00 **
             
2 1/4 2.269 2.293 3.418 3.458 0.078 EXT-2250-01-00
             
  2-3/4     2.800     2.825     3.490     3.510     0.078     EXT-2750-01-00
  2-3/4     2.800     2.825     3.490     3.510     0.078     EXT-2750-02-00 *
* Left Hand Twist    ** Irregular Hole, Left Hand Twist   *** Special Heat Treat   † Alternate Tooth Twist

* Left Hand Twist
**Type B option also stocked

TYPE “B” TOOTH FORM

The Type “B” is listed as an alternative tooth form in ASME B18.21.1 Military Standards, S.A.E., etc. It is available for many of the styles and sizes of tooth washers shown in this catalog, including external, internal, external-internal and many others. To order, specify the WCL part number and designate “Type B” for example: 1114-00 Type B.
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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