Bolting Dimensions

Dimensions for Hex Head Bolt DIN931 

Hex Head Bolts are part threaded.

*Thread lengths listed are a guide value for bolts under 125mm. For bolts longer than 125mm and shorter than 200mm add additional 6mm of thread. For bolts 200mm and longer add 19mm to the thread lengths listed. NB shortest bolt lengths may be or appear to be fully threaded. 

DiameterPitchThread Length*Head DepthAcross 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 Hex Head Setscrew DIN933 

Hex Setscrew Bolts are fully threaded: all other dimensions as Hex Bolt above (thread length not appliable). 

 

Dimensions for Pozi Countersunk Machine Screws DIN965

DiameterPitchHead DiameterHead DepthNo. Cross Recess
M1.6 0.35mm 3.0mm 0.96mm 0
M2 0.4mm 3.8mm 1.2mm 1
M2.5 0.45mm 4.7mm 1.5mm 1
M3 0.5mm 5.6mm 1.65mm 1
M4 0.7mm 7.5mm 2.2mm 2
M5 0.8mm 9.2mm 2.5mm 2
M6 1.0mm 11.0mm 3.0mm 3
M8 1.25mm 14.5mm 4.0mm 4
M10 1.5mm 18.0mm 5.0mm 4

 

Dimensions for Slotted Countersunk Machine Screws DIN963

DiameterPitchHead DiameterHead DepthWidth of Slot
M1.0 0.25mm 1.9mm 0.6mm 0.25mm
M1.6 0.35mm 3.0mm 0.96mm 0.4mm
M2 0.4mm 3.8mm 1.2mm 0.5mm
M2.5 0.45mm 4.7mm 1.5mm 0.6mm
M3 0.5mm 5.6mm 1.65mm 0.8mm
M4 0.7mm 7.5mm 2.2mm 1.0mm
M5 0.8mm 9.2mm 2.5mm 1.2mm
M6 1.0mm 11.0mm 3.0mm 1.6mm
M8 1.25mm 14.5mm 4.0mm 2.0mm
M10 1.5mm 18.0mm 5.0mm 2.5mm
M12 1.75mm 22.0mm 6.0mm 3.0mm
M14 2.0mm 25.0mm 7.0mm 3.0mm
M16 2.0mm 29.0mm 8.0mm 4.0mm
M18 2.5mm 33.0mm 9.0mm 4.0mm
M20 2.5mm 36.0mm 10.0mm 5.0mm

 

Dimensions for Pozi Pan Machine Screws DIN7985

DiameterPitchHead DiameterHead HeightNo. of Cross Recess
M1.6 0.35mm 3.2mm 1.3mm 0
M2 0.4mm 4.0mm 1.6mm 1
M2.5 0.45mm 5.0mm 2.0mm 1
M3 0.5mm 6.0mm 2.4mm 1
M4 0.7mm 8.0mm 3.1mm 2
M5 0.8mm 10.0mm 3.8mm 2
M6 1.0mm 12.0mm 4.6mm 3
M8 1.25mm 16.0mm 6.0mm 4
M10 1.5mm 20.0mm 7.5mm 4

 

Dimensions for Slotted Pan Machine Screws DIN85

DiameterPitchHead DiameterHead HeightWidth of Slot
M2 (≠ DIN) 0.4mm 4.0mm 1.3mm 0.5mm
M2.5 (≠ DIN) 0.45mm 5.0mm 1.5mm 0.6mm
M3 0.5mm 6.0mm 2.1mm 1.0mm
M4 0.7mm 8.0mm 2.4mm 1.2mm
M5 0.8mm 10.0mm 3.0mm 1.2mm
M6 1.0mm 12.0mm 3.6mm 1.6mm
M8 1.25mm 16.0mm 4.8mm 2.0mm
M10 1.5mm 20.0mm 6.0mm 2.5mm

 

Dimensions for Slotted Cheese Machine Screws DIN84

 

DiameterPitchHead DiameterHead HeightWidth of Slot
M1 0.25mm 2.0mm 0.7mm 0.25mm
M1.2 0.25mm 2.3mm 0.8mm 0.3mm
M1.4 0.3mm 2.6mm 0.9mm 0.3mm
M1.6 0.35mm 3.0mm 1.0mm 0.4mm
M1.7 (≠ DIN) 0.35mm 3.4mm 1.2mm 0.4mm
M2 0.4mm 3.8mm 1.3mm 0.5mm
M2.5 0.45mm 4.5mm 1.6mm 0.6mm
M3 0.5mm 5.5mm 2.0mm 0.8mm
M4 0.7mm 7.0mm 2.6mm 1.2mm
M5 0.8mm 8.5mm 3.3mm 1.2mm
M6 1.0mm 10.0mm 3.9mm 1.6mm
M8 1.25mm 13.0mm 5.0mm 2.0mm
M10 1.5mm 16.0mm 6.0mm 2.5mm
M12(≠ DIN) 1.75mm 18.0mm 7.0mm 3.0mm

 

Dimensions for Pozi Raised Countersunk Machine Screws DIN966

DiameterPitchdkk (max.)f ≈No. cross recess
M2 0.4mm 3.8mm 1.2mm 0.5mm 1
M2.5 0.45mm 4.7mm 1.5mm 0.6mm 1
M3 0.5mm 5.6mm 1.65mm 0.75mm 1
M4 0.7mm 7.5mm 2.2mm 1.0mm 2
M5 0.8mm 9.2mm 2.5mm 1.25mm 2
M6 1.0mm 11.0mm 3.0mm 1.5mm 3
M8 1.25mm 14.5mm 4.0mm 2.0mm 4

 

Dimensions for Slotted Raised Countersunk Machine Screws DIN964

DiameterPitchdkk (max.)f ≈No. cross recess
M2 0.4mm 3.8mm 1.2mm 0.5mm 0.5mm
M2.5 0.45mm 4.7mm 1.5mm 0.6mm 0.6mm
M3 0.5mm 5.6mm 1.65mm 0.75mm 0.8mm
M4 0.7mm 7.5mm 2.2mm 1.0mm 1.0mm
M5 0.8mm 9.2mm 2.5mm 1.25mm 1.2mm
M6 1.0mm 11.0mm 3.0mm 1.5mm 1.6mm
M8 1.25mm 14.5mm 4.0mm 2.0mm 2.0mm
M10 1.5mm 18.0mm 5.0mm 2.5mm 2.5mm

 

Dimensions for Coachbolts DIN603 

Diameter Pitch Head diameter Head Depth Width of square Depth of square
M5 0.8mm 13.55mm 3.3mm 5.48mm 4.1mm
M6 1.0mm 16.55mm 3.88mm 6.48mm 4.6mm
M8 1.25mm 20.65mm 4.88mm 8.58mm 5.6mm
M10 1.5mm 24.65mm 5.38mm 10.58mm 6.6mm
M12 1.75mm 30.65mm 6.95mm 12.7mm 8.75mm
M16 2.0mm 38.8mm 8.95mm 16.7mm 12.9mm

 

Dimensions for Standard U Bolts

Nominal Pipe SizeThread SizeBetween CentresDepth of UThread Length
1/2" M6 28mm 48mm 30mm
3/4" M6 34mm 53mm 30mm
1" M6 41mm 60mm 30mm
1.1/4" M10 54mm 67mm 30mm
1.1/2" M10 60mm 85mm 35mm
2" M10 75mm 95mm 35mm
2.1/2" M12 90mm 124mm 55mm
3" M12 102mm 126mm 50mm
4" M12 131mm 144.5mm 50mm
5" M12 156mm 182mm 50mm
6" M12 182mm 210mm 50mm
8" M16 240mm 252mm 50mm
10" M16 292mm 318mm 50mm
12" M16 343mm 363.6mm 50mm

 

 

 

 

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