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The original trapezoidal thread form, and still probably the one most commonly encountered worldwide, with a 29° thread angle, is the Acme thread form (/ ˈ æ k m iː / AK-mee). The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the square thread , [ note 1 ] which had been the form ...
It was the standard-issue rifle of the South African Marine Corps and South African Air Force, as well within the South West African Territorial Force as a substitute for the R1 Rifle (FN FAL) until it was replaced by the R4 assault rifle in the 1980s [54] The rifle's stock would soon break down in the heat and become loose, so a replacement ...