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Dimensions for DIN931 Hex Head Bolt

*Thread lengths listed are a guide value for bolts under 125mm. For bolts longer than 125mm and shorter then 200mm add additional 6mm of thread. For bolts 200mm and longer add 19mm to the thread lengths listed.
Diameter Pitch Thread Length* Head Depth Across Flats
M4 0.7mm 14mm 2.8mm 7mm
M5 0.8mm 16mm 3.5mm 8mm
M6 1.0mm 18mm 4mm 10mm
M7 1.0mm 20mm 4.8mm 11mm
M8 1.25mm 22mm 5.3mm 13mm
M10 1.5mm 26mm 6.4mm 17mm
M12 1.75mm 30mm 7.5mm 19mm
M14 2mm 14mm 8.8mm 22mm
M16 2mm 38mm 10mm 24mm
M18 2.5mm 42mm 11.5mm 27mm
M20 2.5mm 46mm 12.5mm 30mm
M22 2.5mm 50mm 14mm 32mm
M24 3.0mm 54mm 15mm 36mm
M27` 3.0mm 54mm 15mm 41mm
M30 3.5mm 66mm 18.7mm 46mm
M33 3.5mm 72mm 21mm 50mm
M36 4mm 78mm 22.5mm 55mm
M39 4mm 84mm 25mm 60mm
M42 4.5mm 90mm 26mm 65mm
M45 4.5mm 96mm 28mm 70mm
M48 5mm 102mm 30mm 75mm

Dimensions for DIN931 Hex Head Bolt