1. Why to verify
The project is written to a specific standard. If the specification states GOST 7798, but DIN 933 arrives on the construction site — they have slightly different head geometry and tolerances. Technical supervision has the full right to reject it. Substitution is possible, but it must be coordinated by letter before purchase, not after the delivery arrives.
2. Hex head bolts
- GOST 7798 (normal precision) ↔ DIN 931 (partial thread)
- GOST 7805 (increased precision) ↔ DIN 933 (full thread)
- GOST 7796 (reduced head) ↔ DIN 6914 (for metal structures)
The main difference is the key size. GOST head is slightly wider; European tools may not fit properly on a GOST bolt.
3. Nuts and washers
- Hex nut: GOST 5915 ↔ DIN 934
- Flat washer: GOST 11371 ↔ DIN 125
- Spring washer (lock washer): GOST 6402 ↔ DIN 127
4. Property class — a common language
Both GOST and DIN use the same marking: 4.8, 5.6, 8.8, 10.9, 12.9. Substitution works here: 8.8 per GOST = 8.8 per DIN, provided the chemical composition of the steel is comparable.
5. When substitution is not allowed
In government contracts and projects with supervision — never without agreement. In commercial construction — permitted only if the project does not specify a particular standard.
Need to verify your project? We have a complete GOST ↔ DIN comparison table for bolts, nuts, washers, and self-tapping screws — send us your specification, we’ll return it verified.