Overview
ISO 8051:2016 specifies dimensional requirements for long shank machine taps with full‑diameter shanks and recesses, covering nominal thread diameters M3 to M10. This third edition (2016) is a minor revision that adds an informative annex linking the standard’s designations to the ISO 13399 cutting‑tool data model. ISO 8051 complements ISO 2283 (which covers relieved/reduced shank taps) and refers to ISO 8830 for technical specifications and marking.
Key topics and requirements
- Scope: Dimensions for full‑diameter shank taps with recess, nominal diameters M3–M10; intended for long shank machine taps.
- Dimensions and lengths: Threaded lengths follow ISO 529. Shank lengths (L – l) are increased by 50% compared with ISO 529, so overall lengths vary accordingly. Dimension details are given in the standard’s Figure 1 and Table 1.
- Recess: The recess is optional at the manufacturer’s discretion; when omitted the thread length is adjusted per the note in the standard.
- Tolerances: Shank and square tolerances refer to ISO 237 - precision shanks use h9, non‑precision h11, and form/position errors of the square can increase tolerance to h12.
- Marking: Marking requirements are specified by reference to ISO 8830.
- Data mapping: Annex A provides a relationship between ISO 8051 designations and preferred symbols in ISO 13399 for tool data representation and exchange.
Applications and who uses it
- Tool manufacturers: to design and produce long shank full‑diameter taps that meet standardized dimensions and tolerances.
- Machining and production engineers: for selection and specification of taps in CNC and machine‑tool operations requiring long‑reach tapping.
- Procurement and quality control: to verify dimensional conformity, marking, and interchangeability of taps from different suppliers.
- CAD/CAM and tooling data managers: use the Annex A mapping to ISO 13399 to integrate tap data into digital tool libraries and tool‑management systems.
- Standards and compliance teams: ensure shop practices and documentation reference the correct series (ISO 8051 for full‑diameter shank taps; ISO 2283 for reduced shanks).
Related standards
- ISO 2283 - Long shank taps (reduced shank)
- ISO 8830 - High‑speed steel machine taps: technical specifications and marking
- ISO 529 - Short machine taps and hand taps (threaded lengths reference)
- ISO 237 - Rotating tool shank diameters and drive square sizes (tolerances)
- ISO 13399 - Cutting tool data representation and exchange (Annex A mapping)
Keywords: ISO 8051, long shank taps, full‑diameter shank taps with recess, M3 to M10 taps, tap dimensions, machine taps standard, ISO 8830, ISO 2283, ISO 13399.
Open preview (PDF)Long shank taps with nominal diameters from M3 to M10 — Full-diameter shank taps with recess