931-1
For 931-1, fastener description is Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B; iso equivalent is 4014; interchangeability is Nominal size extended; width across flats according to DIN ISO 272 included; modification notes is Nominal size extended; width across flats according to DIN ISO 272 included, verified against its source on 2026-08-12.
- DIN standard
- 931-1 verified
- Fastener description
- Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B verified
- ISO equivalent
- 4014 verified
- Interchangeability
- Nominal size extended; width across flats according to DIN ISO 272 included verified
- Modification notes
- Nominal size extended; width across flats according to DIN ISO 272 included verified
What the source says
Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B | 931-1 | 4014 | 24014 | 4014 | 4014 | 2001-03 | Hexagon head bolts – Product grades A and B | Nominal size extended; width across flats according to DIN ISO 272 included |
— fullerfasteners.com, retrieved 2026-08-12
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Fastener description
fullerfasteners.com says fastener description is Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B, as of 2026-08-12.
Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B | 931-1 | 4014 | 24014 | 4014 | 4014 | 2001-03 | Hexagon head bolts – Product grades A and B | Nominal size extended; width across flats according to DIN ISO 272 included |
https://fullerfasteners.com/tech/din-iso-en-crossover-chart/
trfastenings.com says fastener description is M1,6 to M39 Hexagon Cap Screws partially threaded - product grades A and B, as of 2026-08-12.
DIN 931-1 | ISO 4014 | BS3692 | M1,6 to M39 Hexagon Cap Screws partially threaded - product grades A and B |
https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
Sources
- fullerfasteners.comhttps://fullerfasteners.com/tech/din-iso-en-crossover-chart/
- trfastenings.comhttps://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards