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DIN 7981 Standard Dimensions for Tapping screws, cross recessed pan head

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Technical History and International Equivalents of DIN 7981

This norm has been cancelled
This norm has been replaced by DIN EN ISO 7049

Tapping screws, cross recessed  pan head

Dimensional Drawing and Technical Diagrams

1759_3749.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source DIN 7981Withdrawn
Publication date: 08/1990 - Supersedes DIN 7981: 12/1984
Ø thread size
P
dk max
 dk min
k max
 k min recess nr.
Type H m ref.
Type Z m ref.
y type C
 y type F
2.2
0.8
 4.2 3.9 1.8 1.55 1 2.6 2.4
2
 1.6
2.9
1.1
 5.6 5.3 2.2 1.95 1 3 2.9
2.6
 2.1
3.5
1.3
 6.9 6.54 2.6 2.35 2 4.2 3.9
3.2
 2.5
3.9 1.4 7.5 7.14 2.8 2.55 2 4.4 4.1 3.5 2.7
4.2
1.4
 8.2 7.84 3.05 2.75 2 4.6 4.3
3.7
 2.8
4.8
1.6
 9.5 9.14 3.55 3.25 2 5 4.7 4.3 3.2
5.5
1.8
 10.8 10.37 3.95 3.65 3 6.5 6.2 5 3.6
6.3
1.8
 12.5 12.07 4.55 4.25 3 7.1 6.7 6 3.6

DIN 7981 - ≈ weight in kg x1000 pcs, (ρ=7,85 kg/dm3) - commercial sizes
d thread size ST 2.2 ST 2.9 ST 3.5 ST 3.9 ST 4.2 ST 4.8 ST 5.5 ST 6.3
nominal length l
4.5 0.174
6.5 0.214 0.424
9.5 0.274 0.532 0.84 1.07 1.26 1.85
13 0.344 0.658 1.02 1.29 1.5 2.18 3.24 4.32
16 0.404 0.766 1.17 1.48 1.71 2.46 3.62 4.86
19 0.874 1.32 1.67 1.92 2.74 4 5.4
22 1.47 1.86 2.13 3.02 4.38 5.94
25 1.62 2.05 2.34 3.3 4.76 6.48
32 2.84 3.96 5.67 7.74
38 4.52 6.45 8.82
45
50

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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