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GB/T 899-88
双头螺柱 bm=1.5d
Double end studs-bm=1.5d
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GB/T 900-88
双头螺柱 bm=2d
Double end studs--bm=2d
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GB/T 901-88
等长双头螺柱 B级
Double end studs(clamping type) -Product grade B
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GB/T 15389-94
螺杆
Threaded rods
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GB/T 39-88
方螺母 C级
Square nuts-product grade C
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GB /T 1337-1988
六角自锁螺母
Counterbores for hexagon socket head and slotted cheese head screws
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GB /T 1338-1998
小六角扁自锁螺母
Hexagon self-locking nuts
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GB /T 2161-1991
机床夹具零件及部件 六角头压紧螺钉
The parts and units of jigs and fixtures-Hexagon head holddown screw
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GB /T 2256-1991
机床夹具零件及部件 塑料夹具用六角螺钉
The parts and units of jigs and fixtures.hex screw for plastic fixture
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GB /T 2269-1991
机床夹具零件及部件 镗套螺钉
The parts and units of jigs and fixtures.Boring sleeve screw
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