DIN 931 specifies the requirements for hexagon head bolts with a partial thread and an unthreaded shank. The unthreaded shank provides precise alignment and higher shear strength in structural joints compared to fully threaded bolts.
SRG Fasteners produces DIN 931 bolts extensively in high-tensile grades (8.8, 10.9) for construction, heavy equipment, and bridge-building.
Frequently Asked Questions
When should I use DIN 931 over DIN 933?
Use DIN 931 when the bolted joint is subject to shear forces. The unthreaded shank should be positioned across the shear plane to provide maximum strength and prevent thread damage.