Overview
ISO 7434:2024 defines the characteristics and delivery requirements for slotted set screws with cone point made of steel and stainless steel. The standard covers metric coarse pitch threads from M1.2 to M12, product grade A, dimensional tables, point geometry (cone or truncated cone), length classes, surface conditions and packaging/labeling requirements. ISO 7434 is essential for manufacturers, purchasers and quality engineers who specify or produce slotted set screws for mechanical assemblies.
Key topics and technical requirements
- Scope and sizes: Applies to slotted set screws with cone point for threads M1.2–M12 (metric coarse pitch) and product grade A.
- Point geometry: Point angle references of 90° or 120°; truncated cone point optional for d ≥ M6. End of cone must not be sharp; small rounded/flattened end allowed within specified maximum diameter.
- Dimensions and lengths: Dimensions, pitches and nominal lengths are given in detailed tables (Figures and Tables 1–2). Lengths are classified as regular, short and “too short” for certain sizes.
- Tolerances and threads: Thread and dimensional tolerances are specified by referenced standards (e.g., ISO 724, ISO 965‑1, ISO 4759‑1). General tolerance position for external threads is referenced (tolerance class 6g).
- Materials and mechanical properties: Steel and stainless steel grades covered. Hardness classes and stainless grades for special cases may be selected from ISO 898‑5 (steel set screws) or ISO 3506‑3 (stainless steel set screws).
- Surface condition and coatings: Default delivery is “as processed” for steel and “clean and bright” for stainless steel. Electroplated coatings (ISO 4042) and non‑electrolytically applied zinc flake (ISO 10683) are referenced as options.
- Quality and inspection: Acceptance inspection per ISO 3269; surface discontinuity limits per ISO 6157‑1.
- Marking and labelling: Product marking not required unless agreed; package labeling must include ISO reference, thread size and length, material/grade/hardness class, surface condition, manufacturer ID, lot number and quantity. Example designations are provided (e.g., Set screw ISO 7434 – M5 × 12 – 14H).
Applications and users
- Designed for use in mechanical assemblies that require secure axial positioning with minimal protrusion (machinery, instrumentation, gearboxes, fixtures).
- Primary users: fastener manufacturers, procurement specialists, mechanical designers, OEMs, quality/inspection teams, and distributors who need standardized slotted set screw specifications for interchangeability and procurement.
Related standards
Keywords: ISO 7434, slotted set screws, cone point, metric threads M1.2–M12, product grade A, fasteners standard, stainless steel set screws, hardness class, dimensional tolerances.
