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Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. 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.
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.
The lightweight 16-in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long, 50 times their 16-inch (406 mm) bore diameter with barrels 66.7 ft (20.3 m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108 t) without the breech, and 267,900 lb (121.5 t) with the breech. [1]
However, the 3 + 1 ⁄ 2-inch (89 mm) 12-gauge shell, with its higher SAAMI pressure rating of 14,000 psi (97 MPa) compared to standard 2 + 3 ⁄ 4-inch (70 mm) and 3-inch (76 mm) 12-gauge shells with their lower pressure rating of 11,500 psi (79 MPa), began to approach the performance of the 3 + 1 ⁄ 2-inch (89 mm) 10-gauge shells with a ...
120 mm (4.7 in) QF 4.7 inch Gun Mk I - IV 40-caliber United Kingdom: Second Boer War - World War I 120 mm (4.7 in) QF 4.7 inch Mk V naval gun 45-caliber United Kingdom Japan: World War I - World War II 120 mm (4.7 in) QF 4.7 inch Mk VIII naval gun 40-caliber United Kingdom: World War II 120 mm (4.7 in) QF 4.7 inch Mk IX & XII 45-caliber
Cutaway of a 16-inch gun turret. The primary armament of a Montana-class battleship would have been twelve 16-inch (406 mm)/50 caliber Mark 7 guns, which were to be mounted in four three-gun turrets. The turrets were placed in two superfiring pairs, one forward and one aft. [18]
76.2 mm 3 inch Ordnance QF 13-pounder: Light field gun 76.2 mm 3 inch 15- pounder (multiple types) Field gun 76.2 mm 3 inch Ordnance QF 17- pounder: Anti-tank gun 76.2 mm 3 inch Ordnance QF 18- pounder: Field gun 83.8 mm 3.3 inch Ordnance QF 20-pounder: Tank gun 83.8 mm 3.3 inch Ordnance QF 25-pounder: Gun-howitzer 87.6 mm 3.45 inch
[4] [7] The weapon's muzzle section was displayed at the Watervliet Arsenal museum, which closed in 2013. [8] 16 in Mark III coastal defense gun on a proof mount at Aberdeen Proving Ground, Maryland. The second 16-inch (406 mm) gun was the United States Army 50 caliber Model 1919 (M1919).