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International Standard Category: Inch screw threads

GB/T 20670-2006    Unified screw threads - General plan
统一螺纹 直径与牙数系列 ;
Category No.:21.040.20 Valid Status:valid
Issued Organization:AQSIQ, SAC Issued Date:2006-12-08
Implemented Date:2007-7-1 Abolished Date:
Superseded Standard.: Superseded Date:
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