DIN 604 : Flat Countersunk Nib Bolts

DIN 604 Flat Countersunk Nib Bolts

Dimensions of Flat Countersunk Nib Bolts

Nominal size and thread diameter d Pitch of thread p Thread Length b Diameter of Countersunk head dk Diameter of unthreaded shank ds' Width of nib g i Depth of head k a
Coarse pitch Bolt ≤ 125 Bolt 125 - 200 Bolt ≥ 200 max min max min max min max max min max
M 6 1.0 18 24 - 12.55 11.45 6 5.52 2.5 2.10 2.5 4.0 90° 95°
M 8 1.25 22 28 41 16.55 15.45 8 7.42 3.0 2.60 3.5 5.0 90° 95°
M 10 1.5 26 32 45 19.65 18.35 10 9.42 3.2 2.72 4.2 5.5 90° 95°
M 12 1.75 30 36 49 24.65 23.35 12 11.30 3.6 3.12 5.7 7.0 90° 95°
M 16 2.0 38 44 57 32.80 31.20 16 15.30 4.2 3.72 7.5 9.0 90° 95°
M 20 2.5 46 52 65 32.80 31.20 20 19.16 5.4 4.92 5.7 11.5 60° 65°
M 24 3.0 54 60 73 38.80 37.20 24 23.16 6.6 6.02 6.7 13.0 60° 65°
d M 6 M 8 M 10 M 12 M 16 M 20 M 24
Nominal Size l min l max ls min lg max ls min lg max ls min lg max ls min lg max ls min lg max ls min lg max ls min lg max
20 18.95 21.05 - 9 - 11.5 - 13 - - - - - - - -
25 23.95 26.05 - 9 - 11.5 - 13 - 16 - - - - - -
30 28.95 31.05 - 9 - 11.5 - 13 - 16 - 19 - - - -
35 33.75 36.25 12 17 - 11.5 - 13 - 16 - 19 - - - -
40 38.75 41.25 17 22 11.75 18 - 13 - 16 - 19 - - - -
45 43.75 46.25 22 27 16.75 23 11.5 19 - 16 - 19 - - - -
50 48.75 51.25 27 32 21.75 28 16.5 24 11.25 20 - 19 - 24 - -
55 53.50 56.50 32 37 26.75 33 21.5 29 16.25 25 - 19 - 24 - -
60 58.5 61.5 37 42 31.75 38 26.5 34 21.25 30 - 19 - 24 - 28
65 63.5 66.5 42 47 36.75 43 31.5 39 26.25 35 17 27 - 24 - 28
70 68.5 71.5 47 52 41.75 48 36.5 44 31.25 40 22 32 - 24 - 28
80 78.5 81.5 57 62 51.75 58 46.5 54 41.25 50 32 42 21.5 34 - 28
90 88.25 91.75 67 72 61.75 68 56.5 64 51.25 60 42 52 31.5 44 21 36
100 98.25 101.75 77 82 71.75 78 66.5 74 61.25 70 52 62 41.5 54 31 46
110 108.25 111.75     81.75 88 76.5 84 71.25 80 62 72 51.5 64 41 56
120 118.25 121.75     91.75 98 86.5 94 81.25 90 72 82 61.5 74 51 66
130 128.00 132.00     95.75 102 90.5 98 85.25 94 76 86 65.5 78 55 70
140 138.00 142.00     105.75 112 100.5 108 95.25 104 86 96 75.5 88 65 80
150 148.00 152.00     115.75 122 110.5 118 105.25 114 96 106 85.5 98 75 90
160 156.00 164.00         120.5 128 115.25 124 106 116 95.5 108 85 100

Note :
Length exceeding 50mm must be graded by steps of 10mm. Intermediate lengths should be avoided wherever possible.
For manufacturing reasons the + IT 15 tolerance is permissible for a length of 2d below head. The shark diameter may also be ≈ pitch diameter at manufacturer discretion.