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Other (usually smaller) sizes may occur to reduce weight or cost, including the small series flange bolts defined in ISO 4162 which typically have hexagonal head sizes corresponding to the smaller 1st choice thread size (eg. M6 small series flange bolts have 8mm hexagonal heads, as would normally be found on M5 bolts). [10]
The major minus pitch also works for inch-based threads, but you must first determine the pitch by looking at the number of treads per inch (TPI; for example, 1 ⁄ 20 = 0.050 and 1 ⁄ 13 ≈ 0.077), and your result will only land near a tap drill size (not directly on one). Example (inch coarse): For 7 ⁄ 16-14, 1 in ÷ 14 = 0.071 in; 0.437 ...
For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including: ... M20 17.0 mm 12.0 mm 12.0 mm 30 ...
M20.64: 1.270 mm 60° 13/16"-20 Colt AR-15: M20.64: 1.588 mm 60° The barrel nut thread is M31.75 x 1.411 mm (1-1/4"-18) 13/16"-16 HK416, HK MR223, HK MR556 M21 1.5 mm 60° The barrel nut thread is M32 x 1.5 mm (1.26"-16.93) [citation needed] 0.827"-16.93: Remington Rolling Block No. 2 Rem. Action [6]: 33 Sq21.59: 2.117 mm 90° 30.48 mm*
Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 1 ⁄ 4 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME ...
For sizes 1 ⁄ 4 inch and larger the size is given as a fraction; for sizes less than this an integer is used, ranging from 0 to 16. The integer sizes can be converted to the actual diameter by using the formula 0.060 + (0.013 × number). For example, a #4 screw is 0.060 + (0.013 × 4) = 0.060 + 0.052 = 0.112 inches in diameter.