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Thread rolling screw and twist nails is the difference
Apr 12, 2016

Small spiral; twist conventional understanding is like eating the larger spiral twist;

Therefore, the difference between the two is the screw size is relatively large.

Forming technology for the two conditions are different, thread rolling screw is in thread rolling machine through a pair of roll on roller rotation, extrusion. Twist nail through a special manufacturing process (precision casting, drawing, and so on).

Their purposes are different, roll forming of the spiral is used for solid pieces (such as bolts, screws, etc); twist helical is mainly used for material, a large drill bit.