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M2 is the most widely used industrial HSS. It has small and evenly distributed carbides giving high wear resistance, though its decarburization sensitivity is a little bit high. After heat treatment, its hardness is the same as T1, but its bending strength can reach 4,700 MPa (680,000 psi), and its toughness and thermo-plasticity are higher ...
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).
The M4 bayonet, like the M3 fighting knife that preceded it, was designed for rapid production using a minimum of strategic metals and machine processes, it used a relatively narrow 6.75 in (17.1 cm) bayonet-style spear-point blade with a sharpened 3.5 in (8.9 cm) secondary edge. [1]
The M2 4.2-inch mortar was a U.S. rifled 4.2-inch (107 mm) mortar used during the Second World War, the Korean War, and the Vietnam War. It entered service in 1943. It entered service in 1943. It was nicknamed the "Goon Gun" (from its large bullet-shaped shells, monopod, and rifled bore) or the "Four-Deuce" (from its bore size in inches).
The M2 was followed by the still simpler Leica M1 and then the Leica M4, which used a similar rangefinder design but re-introduced the M3 style frame counter and added a faster loading system and a canted rewind lever. On the present-day used market the M2, originally intended to be more "affordable", sells at prices only slightly lower than ...
The 75 mm gun, models M2 to M6, was the standard American medium caliber gun fitted to mobile platforms during World War II. They were primarily mounted on tanks , such as the M3 Lee and M4 Sherman , but one variant was also used as an air-to-ground gun on the B-25 Mitchell medium bomber aircraft .
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