Overview
ISO 2283:2000 - "Long shank taps with nominal diameters from M3 to M24 and 1/8 in to 1 in - Reduced shank taps" - specifies dimensional requirements for long-shank, reduced-shank machine taps. This second-edition ISO standard (2000) complements ISO 8051 (full-diameter shank taps) and applies to taps used for cutting ISO metric threads (coarse and fine) and ISO inch threads (Unified UNC and UNF series). Informative Annex A lists several non‑recommended inch thread series (BSW, BSF, BA).
Key topics and technical requirements
- Scope and applicability: Dimensions for reduced-shank long shank machine taps with nominal diameters M3–M24 and 1/8 in–1 in.
- Thread types covered: ISO metric (coarse and fine) and ISO inch (UNC, UNF). Non-recommended threads (BSW/BSF/BA) are in Annex A for information only.
- Dimensional data: Detailed dimensions provided in figures and tables (metric and inch tables) for nominal diameter, pitch, thread length, shank length (L − l), square size, and related tolerances.
- Shank length modification: Shank lengths (L − l) are increased by 50% compared with values in ISO 529 for short taps; total tap lengths are adjusted accordingly.
- Thread length: Thread lengths conform to ISO 529.
- Marking and technical specifications: Marking requirements and other technical specifications are referenced to ISO 8830 (high-speed steel machine taps with ground threads).
- Tolerances: Precision shank tolerance h9 (or h11 for non-precision) and guidance on tolerance enlargement (h12) for square-form errors per ISO 237.
Applications and users
Who uses ISO 2283:
- Tool manufacturers producing long shank reduced-shank taps and manufacturers’ quality departments.
- Tooling and cutting-tool designers specifying tap geometry for machine tooling setups.
- Procurement and standards compliance teams in manufacturing specifying taps for parts production.
- CNC/machining shops and maintenance departments selecting taps for deep-reach or hard-to-access threading operations.
- Suppliers and distributors creating product datasheets and ensuring interchangeability.
Practical benefits:
- Ensures interchangeability and consistent dimensions for long shank taps across suppliers.
- Aids correct tap selection for deep-threading operations and tooling fixtures.
- Simplifies procurement by referencing standardized dimensions and marking.
Related standards
- ISO 529: Short machine taps and hand taps (thread lengths referenced)
- ISO 8051: Long shank taps M3–M10 - full-diameter shank taps
- ISO 8830: Technical specifications and marking for high-speed steel machine taps with ground threads
- ISO 237: Diameters of shanks and sizes of driving squares
Keywords: ISO 2283, long shank taps, reduced shank taps, machine taps, ISO metric threads, UNC UNF, tap dimensions, thread tapping standard.