2025-12-21 10.8.118.215
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Latest Standards
JB/ZQ 4325-2006 Studs - b=1. 25d 
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JB/ZQ 4327-2006 Dynamic load prestressed load 
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JB/ZQ 4323-2006 Hexagon bolts - Grade B 
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JB/ZQ 4318-2006 Eye bolts 
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JB/ZQ 4324-2006 Studs - b=1d 
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JB/ZQ 4322-2006 Hex head prestressed bolts 
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JB/ZQ 4304-2006 Wear-resistance cast iron 
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JB/ZQ 4321-2006 U-shaped bolts 
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JB/ZQ 4311-2006 Tolerance of trapezoidal and buttress thread 
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JB/ZQ 4309-2006 Trapezoidal thread with major diameter center and pitch clearance 0. 4 mm 
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JB/ZQ 4316-2006 Hexagon fit bolts 
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JB/ZQ 4310-2006 saw-tooth thread with pitch diameter center 
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JB/ZQ 4305-2006 Machining allowance and allowable deviation of free forging bars 
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JB/ZQ 4308-2006 Trapezoidal thread with large side clearance 
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JB/ZQ 4283-2006 Geometrical tolerance of bevel gear speed reducer box 
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JB/ZQ 4307-2006 Trapezoidal thread with pitch clearance 
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JB/ZQ 4285-2006 Light shrinking-on between gear hole and axis (with keys) 
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JB/ZQ 4280-2006 Size and geometrical tolerance of working roll of hot strip mill 
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JB/ZQ 4282-2006 Geometrical tolerance of cylinder gear speed reducer box 
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JB/ZQ 4279-2006 Size and geometrical tolerance of supporting roll bearing housing of rolling mill 
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