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Screws with British Standard Whitworth Threads (rationalized series)

AS /NZS 2451 - 1998

Display drawing:

Screw Thread 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2
D 0.25 0.313 0.75 0.438 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 1.625 1.75 2
P BSW 20 18 16 14 12 11 10 9 8 7 7 6 6 5 5 4.5
S Max 0.445 0.525 0.6 0.71 0.82 1.01 1.2 1.3 1.48 1.67 1.86 2.05 2.22 2.41 2.58 2.76
S Min 0.435 0.515 0.585 0.695 0.8 0.985 1.175 1.27 1.45 1.64 1.815 2.005 2.175 2.365 2.52 2.7
E Min 0.51 0.61 0.69 0.82 0.95 1.12 1.34 1.45 1.65 1.87 2.07 2.29 2.48 2.7 2.87 3.08
R Min 1/32 1/32 1/32 1/32 1/32 3/64 3/64 1/16 1/16 1/8 1/8 1/8 1/8 1/8 1/8 1/8
K Max 0.186 0.228 0.27 0.312 0.363 0.447 0.53 0.623 0.706 0.79 0.89 0.98 1.06 1.18 1.27 1.43
K Min 0.166 0.208 0.25 0.292 0.333 0.417 0.5 0.583 0.666 0.75 0.83 0.92 1 1.08 1.17 1.33