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pre-holes for cold forming UNEF

UNEF 超细牙螺纹

ASME B1.1

挤压螺纹尺寸 挤压螺纹预钻孔直径
Ø P Gg/1" ømm
1/4–32 UNEF 6,00
5/16–32 UNEF 7,60
3/8–32 UNEF 9,10
7/16–28 UNEF 10,70
1/2–28 UNEF 12,30
9/16–24 UNEF 13,80
5/8–24 UNEF 15,40
3/4–20 UNEF 18,50
7/8–20 UNEF 21,60
1–20 UNEF 24,80
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