扳手开口度 meaning in English

schlüsselweite wrench size

Widths across flats for bolts , screws , valves and fittings
第1部分:螺栓螺钉阀门和配件用扳手开口度
Gages , wrench openings , reference
量规,扳手开口度,标准
Automotive engineering ; hexagon head bolts with small widths across flats not for new constructions
汽车制造.小宽度扳手开口度六角头螺栓
Automotive engineering ; hexagon head screws with small widths across flats not for new constructions
汽车制造.小宽度扳手开口度六角头螺钉