Sea Screw Ltd
Information on 
Hex Head Bolts. 
 
In A2 304 & A4 316 Stainless Steel.
 Made to DIN 931 Standard.   
 
Hex Head Bolts Stainless Steel.

1st size given is the M diameter i.e. M10 = Metric 10mm  
2nd size given is the L length from under the head. 
For Thread Length, Spanner Size & Pitch See chart below. 

 (Metric) 
Bolt Diameter		 Thread Length
Bolts 125mm 
and shorter 		Thread Length
Bolts longer 
than 125mm 		Standard 
Thread Pitch		 Spanner 
Size
M3 = 3mm 12 - 0.50 5.5
M4 = 4mm 14 - 0.70 7
M5 = 5mm 16 22 0.80 8
M6 = 6mm 18 24 1.00 10
M8 = 8mm 22 26 1.25 13
M10 = 10mm 26 28 1.50 17
M12 = 12mm 30 32 1.75 19
M14 = 14mm 34 36 2.00 22
M16 = 16mm 38 40 2.00 24
M18 = 18mm 42 48 2.50 27
M20 = 20mm 46 52 2.50 30