BS EN ISO 8746-2025 PDF

Full title and description

BS EN ISO 8746:2025 — Fasteners. Grooved pins with round head — Full-length diamond grooves. This publication is the British (BS) and European (EN) adoption of ISO 8746:2025 and specifies the dimensional, material and functional characteristics of round‑head grooved pins intended for locking, locating and related fastening applications.

Abstract

Specifies characteristics for round‑head grooved pins with full‑length diamond grooves, available with pilot or chamfered points, in steel and stainless steel and covering nominal diameters typically from 2 mm up to 20 mm. The standard sets dimensional tables, head and groove forms, tolerances, basic material/finish notes and designation rules; general assembly and functional principles for grooved pins are referenced to ISO 13669.

General information

• Status: Published; active national adoption as BS EN ISO 8746:2025 (replaces the previous BS/EN/ISO 8746 editions from 1997/1998).
• Publication date: ISO edition published February 2025; British/EN publication/adoption 10 March 2025 (BS EN ISO 8746:2025).
• Publisher: British Standards Institution (BSI) — identical adoption of ISO 8746:2025 (original publisher: ISO).
• ICS / categories: 21.060.50 — Pins, nails; Fasteners and related components.
• Edition / version: ISO — 3rd edition (2025); Adopted as EN ISO / BS EN ISO 8746:2025.
• Number of pages: National/BS adoption edition: 14 pages (typical published BSI PDF); ISO core document: ~7 pages (ISO published edition content differs by publisher front matter).

Key bibliographic and publication details above are taken from the ISO record and the national/EN adoption notices.

Scope

Defines the requirements for round‑head grooved pins with full‑length diamond grooves intended to provide a spring/elastic interference fit when driven into holes of nominal diameter. The scope covers geometry (pin diameter, head dimensions, groove form), permitted points (pilot or chamfer), materials (steel and stainless steel noted), tolerances, marking/designation and references to general acceptance/inspection standards for fasteners. The document is intended to ensure interchangeability and reliable locking performance in engineering assemblies.

Key topics and requirements

• Dimensional tables for nominal diameters (typical range in the 2 mm–20 mm region for the 2025 edition) including maximum/minimum limits for shank, head and expanded/groove diameters.
• Specification of groove form (full‑length diamond grooves, three equally spaced grooves typical) and head (round head) geometry.
• Allowance for pilot‑point or chamfered point options to facilitate insertion and assembly.
• Material guidance (steel and stainless steel grades referenced) and general finish/marking conventions; reference to related coating/acceptance standards where applicable.
• Designation and ordering code format so that pins are unambiguously described by diameter, length, material and point form.

Typical use and users

Used by mechanical designers, fastener suppliers, purchasing and quality/inspection teams in manufacturing (automotive, machinery, appliances, light engineering) where interchangeable locating, locking or pivot pins are required. Also used by standards committees, testing laboratories and procurement offices specifying component acceptance criteria.

Related standards

Closely related to ISO 13669 (general requirements and functional principles for grooved pins) and to the ISO 8740–8747 family of grooved‑pin standards (parallel, reverse‑taper, taper and other head forms) published in the same package of grooved‑pin standards. National/EN adoption documents and previous ISO 8746 editions (1986, 1997/1998) are superseded by the 2025 edition.

Keywords

grooved pin, round head, diamond grooves, fasteners, locking pin, locating pin, ISO 8746, BS EN ISO, tolerances, pilot point, chamfer point.

FAQ

Q: What is this standard?

A: BS EN ISO 8746:2025 is the British and European adoption of ISO 8746:2025, an international standard that specifies dimensional and functional requirements for round‑head grooved pins with full‑length diamond grooves.

Q: What does it cover?

A: It covers pin geometry (shank, head and groove dimensions), permitted point types (pilot or chamfer), material indications (steel, stainless steel), tolerances, designation/marking and references to related acceptance/inspection standards. It ensures interchangeability and predictable locking behaviour when pins are driven into nominal holes.

Q: Who typically uses it?

A: Mechanical engineers, fastener manufacturers and distributors, procurement and QA/inspection personnel in industries that use pins for locating, locking, pivoting or stopping functions (automotive, machinery, appliances, general engineering). Standards bodies and test laboratories also reference it.

Q: Is it current or superseded?

A: Current — ISO 8746:2025 is the latest ISO edition published in February 2025 and has been adopted as EN ISO and BS EN ISO 8746:2025 (national adoption published in March 2025). It supersedes earlier ISO/EN/BS editions from 1986/1997/1998.

Q: Is it part of a series?

A: Yes — it is part of the ISO grooved‑pin series (ISO 8740–8747 releases published together as a package), and it references ISO 13669 for general grooved‑pin principles.

Q: What are the key keywords?

A: Grooved pin; round head; diamond grooves; fastener; locating pin; locking pin; pilot point; chamfer; tolerances; BS EN ISO 8746:2025.