DIN 7981

Pan head tapping screws

With cross recess or hexalobular socket
Type C-H = with cone end and Philips cross recess H
Type C-Z = with cone end and Pozidriv cross recess Z
Type C-IRS = with cone end and hexalobular drive
Type F-H = with flat end and Philips cross recess H

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Screw Thread
d		 ST2.2 ST2.9 ST3.5 (ST3.9)
P Pitch 0.8 1.1 1.3 1.3
a max 0.8 1.1 1.3 1.3
dk max=nominal size 4.2 5.6 6.9 7.5
min 3.9 5.3 6.54 7.14
k max=nominal size 1.8 2.2 2.6 2.8
min 1.55 1.95 2.35 2.55
y max Type C 2 2.6 3.2 3.5
Type F 1.6 2.1 2.5 2.7
Socket No. 1 1 2 2
M1 ≈ 2.6 3 4.2 4.4
M2 ≈ 2.4 2.9 3.9 4.1

Screw Thread
d		 ST4.2 ST4.8 ST5.5 ST6.3
P Pitch 1.4 1.6 1.8 1.8
a max 1.4 1.6 1.8 1.8
dk max=nominal size 8.2 9.5 10.8 12.5
min 7.84 9.14 10.37 12.07
k max=nominal size 3.05 3.55 3.95 4.55
min 2.75 3.25 3.65 4.25
y max Type C 3.7 4.3 5 6
Type F 2.8 3.2 3.6 3.6
Socket No. 2 2 3 3
M1 ≈ 4.6 5 6.5 7.1
M2 ≈ 4.3 4.7 6.2 6.7



*dimension not ISO standardized, values from DIN 7981


All information is strictly informative