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ASTM weputara ọkọlọtọ ọhụrụ na 2015 (mgbe mwepụta nke ASTM 2015 Mpịakọta 01.08) nke na-eme ka ụkpụrụ mgbochi ihe nhazi isii dị ugbu a n'okpuru otu nkọwa nche anwụ. Ọkọlọtọ ọhụrụ, ASTM F3125, ka akpọrọ “Nkọwapụta maka nnukwu ike Structural Bolts, Steel na Alloy Steel, Ọ...GỤKWUO»
