ISO 2283:2000

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.