NF L22-244-1987 Bolt bihexagonal head with locking hole necked shank ISO thread 4H class fine pitch 《带锁紧孔和颈杆的十二角头螺栓 ISO螺纹 细牙4H级》.pdf

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NF L22-237-1989 Aircraft bolts and nuts Bolt bihexagonal head with locking hole ISO M thread 4G class 《航空用螺栓螺母 带锁紧孔十二角头螺栓 ISO M 螺纹 4G 级》.pdf

NF L22-137-1984 Bolt hexagonal head with locking hole short thread 《带锁紧孔六角头短螺纹螺栓》.pdf

NF L22-139-1984 Bolt hexagonal head close tolerance with locking hole short thread 《带锁紧孔精密头角头短螺纹螺钉》.pdf

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