# 9021 — Fastener standard equivalences: DIN to ISO / EN crossover For 9021, fastener description is Washers; outside diameter ˜ 3 x bolt diameter; iso equivalent is 7093-1; interchangeability is Dimensions partially changed; modification notes is Dimensions partially changed, verified against its source on 2026-08-12. - **DIN standard:** 9021 _(verified: appears in the quote below)_ - **Fastener description:** Washers; outside diameter ˜ 3 x bolt diameter _(verified: appears in the quote below)_ - **ISO equivalent:** 7093-1 _(verified: appears in the quote below)_ - **Interchangeability:** Dimensions partially changed _(verified: appears in the quote below)_ - **Modification notes:** Dimensions partially changed _(verified: appears in the quote below)_ ## What the source says > Washers; outside diameter ˜ 3 x bolt diameter | 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | ## 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. ### Fastener description fullerfasteners.com says fastener description is **Washers; outside diameter ˜ 3 x bolt diameter**, as of 2026-08-12. > Washers; outside diameter ˜ 3 x bolt diameter | 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ fullerfasteners.com says fastener description is **Washers; outside diameter approx. 3 x bolt diameter**, as of 2026-08-12. > 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Washers; outside diameter approx. 3 x bolt diameter | 9021 | 7093-2 | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ monsterbolts.com says fastener description is **Large OD series.**, as of 2026-08-12. > DIN 9021 | ISO 7093 | Fully interchangeable Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners trfastenings.com says fastener description is **Plain Washers with large outside diameter**, as of 2026-08-12. > DIN 9021 | ISO 7093 | | Plain Washers with large outside diameter | Source: https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards ### ISO equivalent fullerfasteners.com says iso equivalent is **7093-1**, as of 2026-08-12. > Washers; outside diameter ˜ 3 x bolt diameter | 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ fullerfasteners.com says iso equivalent is **7093-2**, as of 2026-08-12. > 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Washers; outside diameter approx. 3 x bolt diameter | 9021 | 7093-2 | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ monsterbolts.com says iso equivalent is **7093**, as of 2026-08-12. > DIN 9021 | ISO 7093 | Fully interchangeable Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners trfastenings.com says iso equivalent is **7093**, as of 2026-08-12. > DIN 9021 | ISO 7093 | | Plain Washers with large outside diameter | Source: https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards ### Interchangeability fullerfasteners.com says interchangeability is **Dimensions partially changed**, as of 2026-08-12. > Washers; outside diameter ˜ 3 x bolt diameter | 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ fullerfasteners.com says interchangeability is **Dimensions partially changed**, as of 2026-08-12. > 9021 | 7093-1 | | | 7093-1 | 2000-11 | Plain washers – Large series – Part 1: Product grade A | Dimensions partially changed | Washers; outside diameter approx. 3 x bolt diameter | 9021 | 7093-2 | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ monsterbolts.com says interchangeability is **Fully interchangeable**, as of 2026-08-12. > DIN 9021 | ISO 7093 | Fully interchangeable Source: https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners ## Source - https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ - https://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners - https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards Last verified: 2026-08-12. Review by: 2028-08-11. Part of [Fastener standard equivalences: DIN to ISO / EN crossover](https://referencesource.org/fastener-thread-standard-equivalence/).