ISO 2342:2003

Overview

ISO 2342:2003 specifies the characteristics and dimensions of slotted headless screws with shank (sometimes called slotted set screws with a reduced shank) with metric threads from M1 up to and including M10. This international standard defines geometry, nominal lengths, and dimensional limits for these fasteners and references related ISO standards for materials, mechanical properties, tolerances, coatings and inspection.

Key topics and technical requirements

• Scope: Covers slotted headless screws with shank for metric threads M1–M10 (second edition, replaces ISO 2342:1972).
• Dimensions and geometry: Includes figure and comprehensive dimension table (pitch, shank diameters, thread lengths, nominal lengths and limits). Example thread pitches are specified per size (e.g., P for M1 = 0.25 mm; M2 = 0.4 mm; up to M10 with P = 1.5 mm).
• Threading and tolerances: Thread forms and limits are referenced to ISO 261 and ISO 965‑2 (metric threads for general use); tolerances for fastener dimensions to ISO 4759‑1.
• Materials and mechanical properties: Mechanical classes for carbon/alloy steel and stainless steel are set by reference to ISO 898‑5 and ISO 3506‑3, and for non‑ferrous alloys to ISO 8839.
• Surface finish and coatings: Electrolytic coatings per ISO 4042; non‑electrolytic zinc lamella coatings per ISO 10683.
• Surface defects and inspection: Surface defect limits per ISO 6157‑1; acceptance and sampling per ISO 3269.
• Designation: Standardized designation example - “Vis sans tête ISO 2342 - M4 10 - 14H” (ISO 2342 headless slotted screw, M4, length 10 mm, quality class 14H).

Applications and who uses this standard

• Fastener manufacturers use ISO 2342 to produce slotted headless screws with consistent dimensions and to specify thread pitch and shank geometry.
• Design and mechanical engineers reference it when selecting fasteners for assemblies that require reduced-shank set screws.
• Procurement and quality assurance teams use the standard for purchase specifications, incoming inspection, and conformity checks.
• Machinery builders, automotive, electronics and precision equipment sectors apply these parts where compact, low-profile threaded fastening is required.

Related standards

• ISO 225 (symbols and dimension designations)
• ISO 261, ISO 965‑2 (metric threads)
• ISO 898‑5, ISO 3506‑3, ISO 8839 (mechanical properties)
• ISO 4042, ISO 10683 (coatings)
• ISO 4759‑1 (tolerances), ISO 6157‑1 (surface defects), ISO 3269 (acceptance)

Keywords: ISO 2342, slotted headless screws, headless screws with shank, M1 to M10, metric fastener standards, thread tolerances, fastener dimensions, mechanical properties, surface coating, acceptance inspection.