UNEF thread统一标准特细牙螺纹
UNEF II紧急部队
UNC UNF UNEF UN UNS美制牙
UN UNC UNF UNEF UNS美制螺纹丝攻
UNEF United extreme fine thread公称制细牙
N ACRONYM for() N ACRONYM forUnited Nations Emergency Force 联合国紧急部队