THE SELLERS STANDARD SYSTEM OF SCREW THREADS, NUTS, AND BOLT HEADS.

SCREW THREADS. NUTS. BOLT HEADS.

Diam. of Screw. Threads per inch. Diameter at root of Thread. Area of Bolt at root of Thread. Width of Flat. Short Diam. Rough Short Diam. Finish. Long Diam. Rough. Long Diam. Rough. Thick ness Rough. Thick ness Finish Short Diam. Rough Short Diam. Finish. Long Diam. Rough. Long Diam. Rough. Thick ness Rough. Thick ness Finish

1 420 .185 13 64.026.0062 1 2 7 16 37 64 7 10 1 4 3 16 1 2 7 16 37 64 7 10 1 4 3 16

5 1618 .240 15 64.045.0074 19 32 17 32 11 16 10 12 5 16 1 4 19 32 17 32 11 16 10 12 19 64 1 4

3 816 .294 19 64.067.0078 11 16 5 8 51 64 63 64 3 8 5 16 11 16 5 8 51 64 63 64 11 32 5 16

7 1614 .344 11 32.092.0089 25 32 23 33 9 1017 64 7 16 3 8 25 32 23 32 9 1617 64 25 64 3 8

1 213 .400 13 32.125.0096 7 8 13 161 115 64 1 2 7 16 7 8 13 161 115 64 7 16 7 16

9 1612 .454 29 64.161.0104 31 32 29 3211 8123 64 9 16 1 2 31 32 29 3211 8 123 64 31 64 1 2

5 811 .507 33 64.201.0113 11 161 17 32 11 2 5 8 9 16 11 161 17 32 11 2 17 32 9 16

3 410 .620 5 8.301.0125 11 413 1617 16149 64 3 4 11 16 11 4 13 16 17 16 149 64 5 8 11 16

7 89 .731 47 64.419.0138 17 1613 8121 3221 32 7 8 13 16 17 16 13 8121 3221 32 23 32 13 16

1 8 .837 27 32.550.0156 15 819 1617 8219 641 15 16 15 8 19 16 17 8 219 64 13 16 15 16

11 87 .940 15 16.693.0178 113 1613 4 25 32 29 16 11 811 16 113 16 13 4 25 32 27 16 29 3211 16

11 47 1.06511 16.890.0178 2 115 1625 16253 6411 413 16 2 115 16 25 16 253 641 13 16

13 86 1.16015 321.056.0208 23 1621 8217 3233 32 13 815 16 23 16 21 8 217 32 33 32 13 3215 16

11 26 1.28419 321.294.0208 23 825 1623 4323 6411 217 16 23 8 25 16 23 4 323 64 13 1617 16

15 8 51 21.389125 641.515.0227 29 1621 2231 3235 815 819 16 29 16 21 2 231 32 35 8 19 3219 16

13 45 1.491131 641.746.0250 23 4211 1633 16357 6413 4111 16 23 4 211 1633 16 357 64 13 8111 16

17 85 1.616139 642.051.0250 215 1627 8313 3245 32 17 8113 16 215 16 27 8 313 32 45 32115 32113 16

2 41 21.742123 322.301.0277 31 831 1635 8427 642 115 16 31 8 31 16 35 8 427 64 19 16115 16

21 4 41 21.962131 323.023.0277 31 237 1641 16461 6421 423 16 31 2 37 16 41 16 461 64 13 423 16

21 24 2.176211 643.718.0312 37 8313 1641 2531 6421 227 16 37 8313 1641 2 531 64115 1627 16

23 44 2.426227 644.622.0312 41 443 16 429 326 23 4211 16 41 4 43 16 429 326 21 8211 16

3 31 22.62925 85.428.0357 45 849 1653 8617 323 215 16 45 8 49 16 53 8 617 32 25 16215 16

31 4 31 22.87927 86.509.0357 5 415 16 513 1671 16 31 433 16 5 415 16 513 16 71 16 21 233 16

31 2 31 43.10033 327.547.0384 53 855 1667 32739 6431 237 16 53 8 55 16 67 32 739 64211 1637 16

33 43 3.31735 168.614.0413 53 4511 16 621 3281 8 33 4311 16 53 4511 16621 32 81 8 27 8311 16

4 3 3.56739 169.993.0413 61 861 1673 32841 644 315 16 61 8 61 16 73 32 841 64 31 16315 16

41 4 27 83.798351 6411.329.0435 61 267 1679 16 93 16 41 443 16 61 2 67 16 79 16 93 16 31 443 16

41 2 23 44.02841 3212.742.0454 67 8613 16 731 3293 4 41 247 16 67 8613 16731 32 93 4 37 1647 16

43 4 25 84.25641 414.226.0476 71 473 16 813 32101 4 43 4411 16 71 4 73 16 813 32 101 4 35 8411 16

5 21 24.480431 6415.763.0500 75 879 16 827 321049 645 415 16 75 879 16827 321049 64313 16415 16

51 4 21 24.730447 6417.570.0500 8 715 1699 321123 6451 453 16 8 715 16 99 321123 644 53 16

51 2 23 84.953461 6419.267.0526 83 885 16 923 32117 8 51 257 16 83 885 16923 32 117 8 43 1657 16

53 4 23 85.203513 6421.261.0526 83 4811 16105 3212 53 4511 16 83 4811 16105 32 123 8 43 8511 16

6 21 45.423527 6423.097.0555 91 891 161019 321215 166 515 16 91 891 161019 321215 1649 16515 16

Original table

The dimensions given for diameter at root of threads are also those for diameter of hole in nuts and diameter of lap drills. All bolts and studs 3/4 in. diameter and above, screwed into boilers, have 12 threads per inch, sharp thread, a taper of 1/16 in. per 1 inch; tap drill should be 9/64 in. less than normal diameter of bolts.

The table is based upon the following general formulæ for certain dimensions:

Short diam. rough nut or head=11/2 diam. of bolt + 1/8.

Short diam. finished nut or head=11/2 diam. of bolt + 1/16.

Thickness rough nut=diameter of bolt.

Thickness finished nut=diameter of bolt - 1/16.

Thickness rough head=1/2 short diameter.

Thickness finished head=diameter of bolt - 1/16.