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Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches. The drill sizes that are near this are letter U (0.368 in; 84.2%), 9.5 mm (0.374 in; 85.6%), and 3 ⁄ 8 in (0.375 in; 85.8%); any of these will work well.
A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.
For bits thicker than a minimum size such as 1 ⁄ 8-inch (3.175 mm), they are available in fixed lengths such as 6, 8, 12 or 18 inches (152, 203, 305 or 457 mm) rather than the progressive lengths of jobber drills. 11/32 inch drills: long-series Morse, plain Morse, jobber
BA threads have diameters of 6 mm (0BA) and smaller, and were and still are particularly used in precision machinery. The Whitworth 55° angle remains commonly used today worldwide in form of the 15 British standard pipe threads defined in ISO 7, which are commonly used in water supply, cooling, pneumatics, and hydraulic systems.
The major diameter still extends to within 1 / 8 H of the theoretical sharp V, but the total depth of the thread is reduced 4% from 5 / 8 H = 5 / 8 cos(30°) P ≈ 0.541P to 0.52P. [5] This increases the amount of the theoretical sharp V which is cut off at the minor diameter by 10% from 0.25H to 7 / 8 − 0. ...
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).
Square recess dimensions [7] [8] Color No Screw sizes Fraction Range in mm Orange #00 #1, #2: 0.05 1.3 [9] Yellow #0 #3, #4: 1 ⁄ 16 in + 0.0696–0.071 1.77–1.80 Green #1 #5, #6, #7: 3 ⁄ 32 in - 0.090–0.091 2.3–2.3 Red #2 # 8, #9, #10: 7 ⁄ 64 in + 0.111–0.1126 2.82–2.86 Black #3 #12, 1/4: 1 ⁄ 8 in + 0.1315–0.133 3.34–3.38 ...
The pitch of 0BA is 1 mm and the pitch of each higher numbered thread is obtained by multiplying the pitch of the lower number by 0.9 so K-BA has a pitch of p = 0.9 K [4]: 12 rounded to two significant figures in mm. The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats ...
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