ROYMECHX

Cap Screw Dimensions


Cap Screw Dimensions

Notes:
All linear dimensions in milli metres
Dimensions generally to BS EN ISO 4762 BS 3643- 2 & BS 4168 (superceded)

Nominal Thread. Hex Socket Size Body diameter and Head height Head Dia Soc. length
Size Pitch   Max Min Max Min  
    J D /H A K
M3 0.5 2.50 3.00 2.86 5.50 5.20 1.3
M4 0.70 3.00 4.00 3.82 7.00 6.64 2.00
M5 0.8 4.00 5.00 4.82 8.50 8.14 2.70
M6 1.0 5.00 6.00 5.82 10.00 9.64 3.30
M8 1.25 6.00 8.00 7.78 13.00 12.57 4.3
M10 1.5 8.00 10.00 9.78 16.00 15.57 5.50
M12 1.75 10.00 12.00 11.73 18.00 17.57 6.60
M16 2.0 14.00 16.00 15.73 24.00 23.48 8.80
M20 2.5 17.00 20.00 19.67 30.00 29.48 10.70
M24 3.0 19.00 24.00 23.67 36.00 35.38 12.90


Countersunk Screws (Flat Head Screws)

The dimensions are generally in accordance with BS EN ISO 10642:1998.   This supersedes BS 4168-8.

Nominal size Body Dia Thread Pitch Hex Socket Size Max Cone Dia Head Dia Head Height Soc. length
  D(max) D(min)   J A1 A_max A_Min H K
M3 3.00 2.86 0.5 2,0 6,72 6,00 5,82 1,86 1,05
M4 4.00 3.82 0.70 2,5 8,96 8,00 7,78 2,48 1,49
M5 5.00 4.82 0.8 3,0 11,2 10,00 9,78 3,1 1,86
M6 6.00 5.82 1.0 4,0 13,44 12,00 11,75 3,72 2,16
M8 8.00 7.78 1.25 5,0 17,92 16,00 15,73 4,96 2,85
M10 10.00 9.78 1.5 6,0 22,4 20,00 19,67 6,2 3,60
M12 12.00 11.73 1.75 8,0 26,88 24,00 23,67 7,44 4,35
M16 16.00 15.73 2.0 10,0 33,6 32,00 29,67 8,8 4,89
M20 20.00 19.67 2.5 10,0 40,32 40,00 35,61 10,16 5,49


Sites Providing Information On Socket Screws
  1. Dimensional Data - Socket Cap Screws..Holo-krome dimensional data
  2. PTS_uk..Some useful dimensions of socket screws etc
  3. Fullermetric.Din /ISO dimensions
  4. Ondrives Goto Fasteners Lots of Information on metric screws