Table - 1 American National Standard C135.1-1979

Dimentions of square head bolts , in Inches *Nominal Width across Flat Width across Height

Bolt cornerssize

Basic Max Min Max Min Basic Max Min

3/8 9/16 0.562 0.544 0.795 0.747 1/4 0.268 0.2321/2 3/4 0.750 0.725 1.061 0.995 21/64 0.348 0.3085/8 15/16 0.938 0.906 1.326 1.244 27/64 0.444 0.4003/4 1-1/8 1.125 1.088 1.591 1.494 1/2 0.524 0.4767/8 1-5/16 1.312 1.269 1.856 1.742 19/32 0.620 0.5681 1-1/2 1.500 1.450 2.121 1.991 21/32 0.684 0.628

1-1/4 1-7/8 1.875 1.812 2.652 2.489 27/32 0.876 0.812

Table - 2 American National Standard C135.1-1979

Dimentions of Hex head bolts , in Inches *Nominal Width across Flat Width across Height

Bolt cornerssize

Basic Max Min Max Min Basic Max Min

3/8 9/16 0.562 0.544 0.650 0.620 1/4 0.268 0.2261/2 3/4 0.750 0.725 0.866 0.826 11/32 0.364 0.3025/8 15/16 0.938 0.906 1.083 1.033 27/64 0.444 0.3783/4 1-1/8 1.125 1.088 1.299 1.240 1/2 0.524 0.4557/8 1-5/16 1.312 1.269 1.516 1.447 37/64 0.604 0.5311 1-1/2 1.500 1.450 1.732 1.653 43/64 0.700 0.591

1-1/4 1-7/8 1.875 1.812 2.165 2.066 27/32 0.876 0.749

Table - 3 American National Standard C135.1-1979

Dimentions of Carriage Bolt heads , in Inches Nominal dimeter of head Hight of Head depth of Square

Boltsize

Basic Max Min Basic Max Min Max Min

3/8 13/16 0.844 0.782 3/16 0.208 0.188 0.219 0.1881/2 1-1/16 1.094 1.032 1/4 0.270 0.250 0.281 0.2505/8 1-5/16 1.344 1.219 5/16 0.344 0.313 0.344 0.3133/4 1-9/16 1.594 1.469 3/8 0.406 0.375 0.406 0.3757/8 1-13/16 1.844 1.719 7/16 0.469 0.438 0.469 0.4381 2-1/16 2.094 1.969 1/2 0.531 0.500 0.531 0.500

American National Standard C135.1-1979

Dimentions of square head bolts , in Inches *Maximumradius of

Gillet

0.0310.0310.0620.0620.0620.0930.093

American National Standard C135.1-1979

Dimentions of Hex head bolts , in Inches *Maximumradius of

Gillet

0.0310.0310.0620.0620.0620.0930.093

American National Standard C135.1-1979

Dimentions of Carriage Bolt heads , in Inches width

ofsquare

Max Min

0.338 0.3680.515 0.4920.642 0.6160.768 0.7410.895 0.8651.022 0.990

Table - 4 American National Standard C135.1-1979

Dimentions of Square Nuts , in Inches*1 2 3 4 5 6 7 8 9

Nominal Width across Flat Width across ThicknessBolt cornerssize

Basic Max Min Max Min Basic Max Min

3/8 5/8 0.625 0.606 0.884 0.832 21/64 0.346 0.3101/2 13/16 0.812 0.788 1.149 1.082 7/16 0.458 0.4185/8 1 1.000 0.969 1.414 1.330 35/64 0.569 0.5253/4 1-1/8 1.125 1.088 1.591 1.494 21/32 0.680 0.6327/8 1-5/16 1.312 1.269 1.856 1.742 49/64 0.792 0.7401 1-1/2 1.500 1.450 2.121 1.991 7/8 0.903 0.847

1-1/4 1-7/8 1.875 1.812 2.652 2.489 1-3/32 1.126 1.062

Table - 5 American National Standard C135.1-1979

Dimentions of Square Nuts , in Inches*1 2 3 4 5 6 7 8 9

Nominal Width across Flat Width across ThicknessBolt cornerssize

Basic Max Min Max Min Basic Max Min

3/8 9/16 0.562 0.551 0.650 0.628 21/64 0.337 0.3201/2 3/4 0.750 0.736 0.866 0.840 7/16 0.448 0.4275/8 15/16 0.938 0.922 1.083 1.051 35/64 0.559 0.5353/4 1-1/8 1.125 1.088 1.299 1.240 41/64 0.665 0.6177/8 1-5/16 1.312 1.269 1.516 1.447 3/4 0.776 0.7241 1-1/2 1.500 1.450 1.732 1.653 55/64 0.887 0.831

1-1/4 1-7/8 1.875 1.812 2.165 2.066 1-1/16 1.094 1.030

Table - 6 American National Standard C135.1-1979

Dimentions of Unified Screw Threads , in Inches.1 2 3 4 5 6 7 8 9

Nominal Bolt Threads Mesor Diameter Minor Bolt No.per Stress Dimeter size Inch area

(Sq. In) Max min min* Max Min Nominal

3/8 16 0.077 0.374 0.364 0.359 0.333 0.329 0.2971/2 13 0.142 0.499 0.488 0.482 0.449 0.443 0.4045/8 11 0.226 0.623 0.611 0.605 0.564 0.559 0.5123/4 10 0.334 0.748 0.735 0.729 0.683 0.677 0.6257/8 9 0.462 0.873 0.859 0.852 0.801 0.795 0.7371 8 0.606 0.998 0.983 0.975 0.917 0.910 0.845

1-1/4 7 0.969 1.248 1.231 1.223 1.155 1.148 1.072

Table - 7 American National Standard C135.1-1979

Dimention for Nuts and Tapped Parts , in Inches1 2 3 4 5 6 7 8

Nominal No. of Pitch Minor Mejor Nominal Bolt Size Threads Diameter Diameter Diameter Tap Size

per Inch Min Max Min Max Min OD

3/8 16 0.350 0.356 0.323 0.377 0.390 0.390-161/2 13 0.470 0.476 0.437 0.454 0.520 0.520-135/8 11 0.587 0.594 0.548 0.567 0.646 0.646-113/4 10 0.706 0.714 0.663 0.684 0.771 0.717-107/8 9 0.824 0.832 0.776 0.799 0.896 0.896-91 8 0.940 0.949 0.886 0.911 1.021 1.021-8

1-1/4 7 1.178 1.188 1.116 1.144 1.271 1.271-7