Overview
ISO 5420:1983 - "Reamers - Terms, definitions and types" is an international vocabulary standard that defines geometrical terms and common types of reamers. Published in 1983, it gives rigorous, internationally valid definitions of reamer features (axis, shank types, flutes, taper lead, bevel/chamfer, cutting diameter, helix angle, etc.) and illustrates them with figures. The standard follows the tool‑in‑hand reference system of ISO 3002/1 and includes equivalent terminology in several European languages in addition to the three official ISO languages (English, French, Russian).
Key topics and technical content
- Vocabulary and geometry: Precise definitions for reamer elements such as axis, body, shank (taper, parallel, hand square), recess (diameter and length), cutting edge length, taper lead and taper lead angle, bevel/chamfer (cutting and non‑cutting), cutting diameter, back taper, helix angle, and flutes.
- Shank and end details: Clear terms for shank forms and features (tenon/flat for ejection, size and length of square on hand shanks, shank length).
- Entry and lead features: Distinction between taper leads, bevel leads (cutting and non‑cutting), chamfer lengths and angles - all described to eliminate ambiguity in drawings and specifications.
- Rotation and helix: Definitions for right‑hand and left‑hand cutting reamers and helix angle terminology.
- Multilingual terminology: Primary ISO terms in English, French and Russian, plus equivalent German, Italian, Dutch and Slovak terms (for reference).
- Normative context: Uses the tool‑in‑hand system (ISO 3002/1) and cross‑references numerous related ISO documents for specific reamer classes.
Applications and who uses it
ISO 5420 is a reference vocabulary used to:
- Create unambiguous engineering drawings and specifications for reamers.
- Support technical communication between designers, manufacturers, quality engineers and procurement.
- Standardize terminology in standards committees, technical publications and translations.
- Aid tooling design, metrology, inspection and documentation in machining, toolmaking and maintenance departments.
Typical users: tool designers, cutting‑tool manufacturers, machine‑shop engineers, quality/inspection staff, technical authors and standards specialists.
Related standards
ISO 5420 references and complements other ISO standards for reamers and related tooling, for example:
- ISO 3002/1 (tool‑in‑hand reference system)
- ISO standards for hand and machine reamers, shell reamers, bridge reamers and taper‑pin reamers (as listed in the document)
Using ISO 5420 ensures consistent, internationally accepted terminology for reamer geometry and types - a practical foundation for design, procurement and cross‑border technical communication.
