Machinery's Handbook, 31st Edition
WHITWORTH THREADS
2087
Table 2. Threads of Whitworth Form—Basic Dimensions
p
H 6
p = 1 ÷ n H = 0.960491 p H/6 = 0.160082 p h = 0.640327 p e = 0.0739176 p r = 0.137329 p
r e
h
55°
r
H
H 6
Threads per Inch
Triangular Height 0.013340 0.016009 0.017151 0.020010 H 0.024012 0.026680 0.030015 0.034303 0.036942 0.040020 0.043659 0.048025 0.050553 0.053361 0.060031 0.068607 0.080041 0.087317 0.096049 0.106721 0.120061 0.137213 0.160082 0.192098 0.213442 0.240123 0.274426 0.295536 0.320164 0.334084 0.349269 0.365901 0.384196
Depth of Thread 0.008894 0.010672 0.011434 0.013340 h 0.016008 0.017787 0.020010 0.022869 0.024628 0.026680 0.029106 0.032016 0.033702 0.035574 0.040020 0.045738 0.053361 0.058212 0.064033 0.071147 0.080041 0.091475 0.106721 0.128065 0.142295 0.160082 0.182951 0.197024 0.213442 0.222722 0.232846 0.243934 0.256131
Depth of Rounding 0.001027 0.001232 0.001320 0.001540 e 0.0011848 0.002053 0.002310 0.002640 0.002843 0.003080 0.003366 0.003696 0.003890 0.004107 0.004620 0.005280 0.006160 0.006720 0.007392 0.008213 0.009240 0.010560 0.012320 0.014784 0.016426 0.018479 0.021119 0.022744 0.024639 0.025710 0.026879 0.028159 0.029567
Pitch
Shortening
Radius
H /6
n
p
r
72 60 56 48 40 36 32 28 26 24 22 20 19 18 16 14 12 11 10
0.013889 0.016667 0.017857 0.020833 0.025000 0.027778 0.031250 0.035714 0.038462 0.041667 0.045455 0.050000 0.052632 0.055556 0.062500 0.071429 0.083333 0.090909 0.100000 0.111111 0.125000 0.142857 0.166667 0.20000 0.222222 0.250000 0.285714 0.307692 0.333333
0.002223 0.002668 0.002859 0.003335 0.004002 0.004447 0.005003 0.005717 0.006157 0.006670 0.007276 0.008004 0.008425 0.008893 0.010005 0.011434 0.013340 0.014553 0.016008 0.017787 0.020010 0.022869 0.026680 0.032016 0.035574 0.040020 0.045738 0.049256 0.053361 0.055681 0.058212 0.060984 0.064033
0.001907 0.002289 0.002452 0.002861 0.003433 0.003815 0.004292 0.004905 0.005282 0.005722 0.006242 0.006866 0.007228 0.007629 0.008583 0.009809 0.011444 0.012484 0.013733 0.015259 0.017166 0.019618 0.022888 0.027466 0.030518 0.034332 0.039237 0.042255 0.045776 0.047767 0.049938 0.052316 0.054932
9 8 7 6 5
4.5
4
3.5 3.25
3
2.875 0.347826
2.75
0.363636
2.625 0.380952
2.5
0.400000
Dimensions are in inches. Allowances: Only Free Class and Medium Class bolts have an allowance. For nominal sizes of 3 ∕ 4 inch down to 1 ∕ 4 inch, the allowance is 30 percent of the Medium Class bolt effec tive-diameter tolerance (0.3 T ); for sizes less than 1 ∕ 4 inch, the allowance for the 1 ∕ 4 -inch size applies. Allowances are applied minus from the basic bolt dimensions; the tolerances are then applied to the reduced dimensions.
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