# 7978 — Fastener standard equivalences: DIN to ISO / EN crossover For 7978, fastener description is Unhardened taper pins with internal thread; iso equivalent is 8736; en iso number is 28736; interchangeability is Dimensions partially changed; modification notes is Dimensions partially changed, verified against its source on 2026-08-12. - **DIN standard:** 7978 _(verified: appears in the quote below)_ - **Fastener description:** Unhardened taper pins with internal thread _(verified: appears in the quote below)_ - **ISO equivalent:** 8736 _(verified: appears in the quote below)_ - **EN ISO number:** 28736 _(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 > 7978 | | 28736 | | 8736 | 1992-10 | Unhardened taper pins with internal thread | 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 **Unhardened taper pins with internal thread**, as of 2026-08-12. > 7978 | | 28736 | | 8736 | 1992-10 | Unhardened taper pins with internal thread | Dimensions partially changed | Source: https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ trfastenings.com says fastener description is **Taper Pins with internal thread**, as of 2026-08-12. > DIN 7978 | ISO 8736 | | Taper Pins with internal thread | Source: https://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards ## Source - https://fullerfasteners.com/tech/din-iso-en-crossover-chart/ - 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/).