Large Diameter Hex Bolts with Extended Threads

Download Flyer for Large Diameter Boltspdf 400 kb (2 pages)
These high quality fasteners are custom made from 4140 material with extended rolled threads.  This allows these fasteners to be used for a larger range of length applications with minimal modification.

Where a length modification is required the threads do not have to be re-machined and the mechanical integrity of the fastener will be retained*
The charts below show the sizes we stock and the possible length combinations that can be made from the stocked parts

For example in the first table we stock a M16 (diameter) by 400mm (length). From this M16x400 bolt you can make bolts that are anywhere from 260mm - 400mm long (260, 280, 300, 320, 340, 360 and 380). Since the original bolt has extended threads even after cutting the bolt you will still have an appropriate amount of thread (minimum “b” dimension according to DIN standards) without having to rethread the bolt after cut-off.
DIN 931 Specification
Big Bolt Table Explanation
Diameter M16 M18 M20 M22 M24 M27
k 10 11.5 12.5 14 15 17
s max 24 27 30 32 36 41
e min 26.75 30.14 33.53 35.72 39.98 45.2
b for l > 200mm 57 61 65 69 73 79
Thread Length 200 200 300 150 200 200 300 200 200 200 300 150 200 200 300 200 200 200 300 300 400
Bolt Length 400 500 700 300 400 500 700 400 500 600 800 300 400 500 700 400 500 600 800 500 800
220 1 1
240 1 1
260 1 1 1
280 1 1 1 1 1 1 1 1
300 1 1 1 1 1 1 1 1
320 1 1 1 1 1 1
340 1 1 1 1 1 1
360 1 1 1 1 1 1 1
380 1 1 1 1 1 1 1 1 1 1 1
400 1 1 1 1 1 1 1 1 1 1 1
420 1 1 1 1 1 1
440 1 1 1 1 1 1
460 1 1 1 1 1 1 1
480 1 1 1 1 1 1 1 1 1 1 1 1
500 1 1 1 1 1 1 1 1 1 1 1 1
520 1 1 1 1 1 1
540 1 1 1 1 1 1
560 1 1 1 1 1 1
580 1 1 1 1 1 1 1 1
600 1 1 1 1 1 1 1 1
620 1 1 1 1 1 1
640 1 1 1 1 1 1
660 1 1 1 1 1 1
680 1 1 1 1 1 1
700 1 1 1 1 1 1
720 1 1 1
740 1 1 1
760 1 1 1
780 1 1 1
800 1 1 1


Diameter M30 M33 M36 M39 M42 M45 M48 M56 M64
k 18.7 21 22.5 25 26 28 30 35 40
s max 46 50 55 60 65 70 75 85 95
e min 50.85 45.37 60.79 66.44 71.3 76.95 82.6 93.56 104.86
b for l > 200mm 85 91 97 103 109 115 121 137 153
Thread Length 200 200 200 300 300 400 200 200 200 300 150 200 350 250 400 250 400 250 400 400 400 400 400
Bolt Length 400 500 600 800 500 800 400 500 600 800 300 400 700 500 800 500 800 500 800 600 800 600 800
260 1
280 1
300 1 1 1 1
320 1 1 1 1
340 1 1 1 1 1
360 1 1 1 1 1 1 1
380 1 1 1 1 1 1 1 1 1
400 1 1 1 1 1 1 1 1 1 1 1
420 1 1 1 1 1 1 1 1
440 1 1 1 1 1 1 1 1
460 1 1 1 1 1 1 1 1 1
480 1 1 1 1 1 1 1 1 1
500 1 1 1 1 1 1 1 1 1 1 1 1
520 1 1 1 1 1 1 1 1
540 1 1 1 1 1 1 1 1 1 1
560 1 1 1 1 1 1 1 1 1 1 1
580 1 1 1 1 1 1 1 1 1 1 1
600 1 1 1 1 1 1 1 1 1 1 1 1 1
620 1 1 1 1 1 1 1 1 1
640 1 1 1 1 1 1 1 1 1
660 1 1 1 1 1 1 1 1 1
680 1 1 1 1 1 1 1 1 1
700 1 1 1 1 1 1 1 1 1
720 1 1 1 1 1 1 1 1
740 1 1 1 1 1 1 1 1
760 1 1 1 1 1 1 1 1
780 1 1 1 1 1 1 1 1
800 1 1 1 1 1 1 1 1

*All information is strictly informative