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Home / Product / Screw / Self Tapping Screw / DIN 7981 Stainless Steel Pan Head Phillips Self Tapping Screw
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DIN 7981 Stainless Steel Pan Head Phillips Self Tapping Screw

Series: DIN7981
Model No.: 304HC-DIN7981
Brand: HAINA

Quantity:
  • din7981
  • HNF
  • 7318159090

 DIN 7981 Stainless Steel Pan Head Phillips Self Tapping Screw

self-tapping screw is a screw that can tap its own hole as it is driven into the material. For hard substrates such as metal or hard plastics, the self-tapping ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own hole in a metal substrate, a self-tapping one can (within reasonable limits of substrate hardness and depth). For softer substrates such as wood or soft plastics, the self-tapping ability can come simply from a tip that tapers to a gimlet point (in which no flute is needed). Like the tip of a nail or gimlet, such a point forms the hole by displacement of the surrounding material rather than any chip -forming drilling/cutting/evacuating action.

GRADE CHEMICAL COMPOSITION1(%MAXIMA UNLESS STATED) NOTES ALTERNATIVE NAMES
C Si Mn P S Cr Mo Ni Cu
A1 0.12 1 6.5 0.2 0.15/0.35 16-19 0.7 5-10 1.75-2.25 2 3 4 303S31,303S42,1.4305
A2 0.1 1 2 0.05 0.03 15-20 5 8-19 4 6 7 304,394S17(BS3111),1.4301,1.4567
A3 0.08 1 2 0.045 0.03 17-19 5 9-12 1 8 321,1.4541,347,1.4550
A4 0.08 1 2 0.045 0.03 16-18.5 2-3 10-15 4 7 9 316,1.4401,1.4578
A5 0.08 1 2 0.045 0.03 16-18.5 2-3 10.5-14 1 8 9 316Ti,1.4571,316Cb,1.4580
C1 0.09-0.15 1 1 0.05 0.03 11.5-14 - 1 - 9 410,1.4006
C3 0.17-0.25 1 1 0.04 0.03 16-18 - 1.5-2.5 -
431,1.4057
C4 0.08-0.15 1 1.5 0.06 0.15-0.35 12-14 0.8 1
2 9 416,1.4005
F1 0.12 1 1 0.04 0.03 15-18 10 1
11 12 430,1.4016,430Ti,1.4520,430Cb,1.4511

DIN7981盘头十字自攻螺丝.jpg

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