DIN 7981 pan head cross recess self-tapping screws have a slightly rounded top and a flat support surface at the bottom. They have coarse threads and drill bits for cutting threads in pre-drilled, untapped holes.
DIN 7981 Specifications
Current norm: DIN ISO 7049
Equivalent norms: ISO 7049; CSN 021235; UNI 6954;
Type Phillips H
mm P a max dk max dk min k No. M t min t max ST2.2 0.8 0.8 4.3 4 1.3 1 2.4 1.1 1.35 ST2.9 1.1 1.1 5.5 5.2 1.7 1 2.8 1.48 1.73 ST3.5 1.3 1.3 6.8 6.44 2.1 2 4 1.6 2.06 ST3.9 1.3 1.3 7.5 7.14 2.3 2 4.2 1.85 2.31 ST4.2 1.4 1.4 8.1 7.74 2.5 2 4.4 2.05 2.51 ST4.8 1.6 1.6 9.5 9.14 3 2 5 2.64 3.1 ST5.5 1.8 1.8 10.8 10.37 3.4 3 6.3 2.72 3.18 ST6.3 1.8 1.8 12.4 11.97 3.8 3 7 3.38 3.84
Type Pozi Z
mm P a max dk max dk min k max k min r max No. M t min t max ST2.2 0.8 0.8 4.2 3.9 1.8 1.55 0.3 1 2.4 1.1 1.35 ST2.9 1.1 1.1 5.6 5.3 2.2 1.95 0.4 1 2.9 1.58 1.83 ST3.5 1.3 1.3 6.9 6.54 2.6 2.35 0.5 2 3.9 1.47 1.93 ST3.9 1.3 1.3 7.5 7.14 2.8 2.55 0.5 2 4.1 1.7 2.16 ST4.2 1.4 1.4 8.2 7.84 3.05 2.75 0.6 2 4.3 1.88 2.34 ST4.8 1.6 1.6 9.5 9.14 3.55 3.25 0.7 2 4.7 2.28 2.74 ST5.5 1.8 1.8 10.8 10.37 3.95 3.65 0.8 3 6.2 2.51 2.97 ST6.3 1.8 1.8 12.5 12.07 4.55 4.25 0.9 3 6.7 3.02 3.48
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