Ngwaahịa nchara US nwere ụkpụrụ ndị ọzọ, tumadi na ngalaba ndị a:

ANSI– American National Standard

AISI– American Society of Iron and Steel Standards

ASTM– American Society for Testing and Materials

ASME- American Society of Mechanical Engineers

AMS-Nkọwapụta ihe nke ikuku (otu n'ime nkọwapụta ihe ndị a na-ejikarị na ụlọ ọrụ ụgbọ elu US, nke SAE mepụtara)

API– Ụkpụrụ ụlọ ọrụ American Petroleum

AWS– American Welding Association Standard

SAE– American Society of Automotive Engineers Standards

MIL– Ụkpụrụ ndị agha US

Qq– Ụkpụrụ gọọmentị etiti US

API– Ụkpụrụ ụlọ ọrụ American Petroleum

ANSI– American National Standard

ASME- American Society of Mechanical Engineers

ASTM– American Society for Testing and Materials

Ụkpụrụ ndị a, ha niile bụ nke ọkọlọtọ nchara US, dị ka ASME n'ihe eji eji ụkpụrụ eme ihe bụ site na ASTM, valvụ dị na API ọkọlọtọ ọkọlọtọ, yana akwa akwa ígwè dị nro sitere na ọkọlọtọ ANSI.Ihe dị iche na-elekwasị anya dị iche iche nke ụlọ ọrụ ahụ, ya mere nnabata nke ụkpụrụ dị iche iche.API, ASTM, ASME bụ ndị otu ANSI.Ụkpụrụ American National Standards Institute, ọnụ ọgụgụ ka ukwuu sitere na ụkpụrụ ọkachamara.N'aka nke ọzọ, ndị ọkachamara ọkachamara, ndị otu, otu nwekwara ike ịdabere na ụkpụrụ mba dị ugbu a iji mepụta ụfọdụ ụkpụrụ ngwaahịa.N'ezie, ike na-eso mba ọkọlọtọ ịzụlite ha onwe ha mkpakọrịta ụkpụrụ.Ụkpụrụ ANSI bụ nke afọ ofufo.United States kwenyere na ụkpụrụ amanyere iwu nwere ike igbochi uru nrụpụta.Mana site na iwu na ngalaba gọọmentị iji mepụta ụkpụrụ, n'ozuzu ụkpụrụ amanyere iwu.