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  5. DIN 7981C Hexalobular Pan AB Self Tapping Screws

DIN 7981C Hexalobular Pan AB Self Tapping Screws

DIN 7981C Equivalents

ISO 7049 UNI 6954 CSN 21235

DIN 7981C Hexalobular Pan AB Self Tapping Screws
Pan Head Tapping Screws With Cross Recess H And Z, Form C

DIN 7981C Dimensions

Thread size P a dk k r rf Cross recess Type H Type Z y
m Penetration deptd m Penetration deptd max.
max. nominal=max. min. nominal=max. min. max. approx. No. approx. min. max. approx. min. max. Type C Type F
ST2.2 0.8 0.8 4.2 3.9 1.8 1.55 0.3 3.4 1 2.6 0.86 1.32 2.4 1.1 1.35 2 1.6
ST2.9 1.1 1.1 5.6 5.3 2.2 1.95 0.4 4.4 1 3 1.35 1.8 2.9 1.58 1.83 2.6 2.1
ST3.5 1.3 1.3 6.9 6.54 2.6 2.35 0.5 5.4 2 4.2 1.4 2.03 3.9 1.47 1.93 3.2 2.5
(ST3.9) 1.3 1.3 7.5 7.14 2.8 2.55 0.5 5.8 2 4.4 1.63 2.26 4.1 1.7 2.16 3.5 2.7
ST4.2 1.4 1.4 8.2 7.84 3.05 2.75 0.6 6.2 2 4.6 1.8 2.46 4.3 1.88 2.34 3.7 2.8
ST4.8 1.6 1.6 9.5 9.14 3.55 3.25 0.7 7.2 2 5 2.26 2.87 4.7 2.28 2.74 4.3 3.2
ST5.5 1.8 1.8 10.8 10.37 3.95 3.65 0.8 8.2 3 6.5 2.49 3.15 6.2 2.51 2.97 5 3.6
ST6.3 1.8 1.8 12.5 12.07 4.55 4.25 0.9 9.5 3 7.1 3 3.66 6.7 3.02 3.48 6 3.6
l Type C Type F Approximate mass (7.85 kg/dm3). per 1000
units in kg
nominal min. max. min. max.
4.5 3.7 5.3 3.7 4.5 0.174              
6.5 5.7 7.3 5.7 6.5 0.214 0.424            
9.5 8.7 10.3 8.7 9.5 0.274 0.532 0.84 1.07 1.26 1.85    
13 12.2 13.8 12.2 13 0.344 0.658 1.02 1.29 1.5 2.18 3.24 4.32
16 15.2 16.8 15.2 16 0.404 0.766 1.17 1.48 1.71 2.46 3.62 4.86
19 18.2 19.8 18.2 19   0.874 1.32 1.67 1.92 2.74 4 5.4
22 21.2 22.8 20.7 22     1.47 1.86 2.13 3.02 4.38 5.94
25 24.2 25.8 23.7 25     1.62 2.05 2.34 3.3 4.76 6.48
32 30.7 33.3 30.7 32         2.83 3.96 5.67 7.74
38 36.7 39.3 36.7 38           4.52 6.45 8.82