DIN 931 — Hexagon Head Bolts with Partial Thread

DIN 931 is the classic German standard for partially threaded hexagon head bolts — now largely superseded by ISO 4014, but still specified on legacy drawings.

What It Covers

• Partially threaded hex bolts
• Strength classes
• Thread and length combinations
• Legacy vs ISO 4014 equivalence

Related Fasteners

• Hex Bolt
• Flange Bolt
• Hex Nut
• Flat Washer