unify thread meaning in English

统一标准螺纹

High tensile steel fork joints unified threads for aircraft
航空用高强度钢叉形接头
Specification for clinch nuts unified threads for aircraft
飞行器用防松螺母
Specification for steel shear bolts unified hexagons and unified threads
钢制抗剪螺栓
Specification for stiffnuts unified threads for aircraft
航天器用系紧螺母
Specification for steel pan head bolts unified threads for aircraft
飞行器用盘头钢螺栓

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