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Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
Standard gauge known as Gauge 3 in the UK (scaled at 17 ⁄ 32 inch to the foot) and known as Gauge 2 + 1 ⁄ 2 on the Märklin factory standards from 1891. III: 1:16: 89 mm (3 + 1 ⁄ 2 in) 63.5 mm: 45 mm: 32 mm: 22.5 mm: V: 1:11: 127 mm (5 in) 89 mm: 63.5 mm: 45 mm: 32 mm: Common gauge for Live Steam scaled at 1 + 1 ⁄ 16 inches to the foot ...
From 1.0 through 2.95 mm, sizes are defined as follows, where N is an integer from 10 through 29: N · 0.1 mm; N · 0.1 + 0.05 mm; From 3.0 through 13.9 mm, sizes are defined as follows, where N is an integer from 30 through 139: N · 0.1 mm; From 14.0 through 25.0 mm, sizes are defined as follows, where M is an integer from 14 through 25: M ...
No. 7/0, the largest size, is 0.50 in. (500 thou or 12.7 mm) dia., No. 1 is 0.30 in. (300 thou), and the smallest, No. 50, is 0.001 in. (1 thou or 25.4 µm). The system as a whole approximates an exponential curve, plotting diameter against gauge-number (each size is a approximately a constant multiple of the previous size). The weight per unit ...
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In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications.