DIN standards issued by the German Institute for Standardization dominate European fastener specifications. Though many have been superseded by ISO, DIN numbers remain widely used in global procurement and engineering drawings.

DIN to ISO & GB Equivalents

• DIN 931 ≈ ISO 4014 ≈ GB/T 5782 — Hex head bolts
• DIN 933 ≈ ISO 4017 ≈ GB/T 5783 — Hex head screws (full thread)
• DIN 934 ≈ ISO 4032 ≈ GB/T 6170 — Hex nuts
• DIN 912 ≈ ISO 4762 ≈ GB/T 70.1 — Socket head cap screws
• DIN 125 ≈ ISO 7089 ≈ GB/T 97.1 — Plain washers

Popular DIN Standard Numbers

Bolts & Screws

• DIN 931 — Hex head bolts, partial thread
• DIN 933 — Hex head screws, full thread
• DIN 912 — Socket head cap screws
• DIN 7984 — Socket head cap screws, low head
• DIN 6912 — Socket head cap screws, low head with serration
• DIN 6921 — Hex flange bolts
• DIN 603 — Coach bolts (cup head square neck)
• DIN 601 — Hex head bolts, product grade C

Nuts

• DIN 934 — Hex nuts
• DIN 985 — Hex nuts with nylon insert (Nyloc)
• DIN 982 — Hex nuts with nylon insert, thin
• DIN 6923 — Hex flange nuts
• DIN 1587 — Hex cap nuts (acorn)

Washers

• DIN 125 — Plain washers, normal series
• DIN 127 — Spring lock washers
• DIN 9021 — Plain washers, large series
• DIN 7980 — Spring lock washers (curved)
• DIN 6797 — Toothed lock washers

Retaining Rings & Pins

• DIN 471 — External retaining rings (shaft)
• DIN 472 — Internal retaining rings (bore)
• DIN 6799 — Retaining washers (E-clips)
• DIN 1481 — Spring pins (slotted)
• DIN 7343 — Spring pins (coiled)