Overview
ISO 4015:2022 specifies the characteristics of hexagon head bolts with reduced shank (shank diameter ≈ pitch diameter) - product grade B. It applies to bolts in steel and stainless steel with metric coarse pitch threads M3 to M20. The standard covers dimensions, tolerances, mechanical property options, surface conditions, marking/labelling and designation rules for this family of partially threaded hexagon head bolts.
Key topics and requirements
- Scope and product grade: Applies to hexagon head bolts with a reduced shank (partially threaded), product grade B. For full-shank bolts see ISO 4014.
- Dimensions and geometry: Detailed dimensional tables for M3–M20, head and bearing-face options, permissible indentation and thread run-out; figures and tables define s, k, e, x, d and length ranges.
- Materials and property classes:
- Steel: Common property classes listed (e.g., 5.8, 6.8, 8.8); property classes selectable from ISO 898-1.
- Stainless steel: Typical grades A2-50, A2-70 per ISO 3506-1; other grades selectable as needed.
- Thread tolerances: Thread tolerance class 6g and reference to ISO 965-1 for general-purpose metric threads.
- Surface condition and coatings: “As processed” (steel) or “clean and bright” (stainless) by default; electroplated, zinc-flake, hot-dip galvanizing and other coatings referenced (ISO 4042, ISO 10683, ISO 10684).
- Quality, inspection and defects: Acceptance inspection per ISO 3269; surface discontinuity guidance per ISO 6157-1.
- Marking and labelling: Product marking per ISO 898-1 or ISO 3506-1; package labelling must include ISO 4015 reference, thread size and length, property class/grade, surface condition, manufacturer ID, lot number and quantity.
- Designation: Follows ISO 8991 format. Example: Hexagon head bolt ISO 4015 – M12 × 80 – 5.8
Applications and typical users
- Engineers, designers and CAD modelers specifying fasteners for machinery, structural assemblies, automotive, rail, and equipment manufacturing where partially threaded bolts are required.
- Fastener manufacturers and suppliers using ISO 4015:2022 for production, inspection and product data sheets.
- Procurement specialists and quality inspectors ensuring delivered bolts meet dimensional, mechanical and marking requirements.
- Maintenance and assembly teams selecting correct grade and coating for service environment and corrosion resistance.
Related standards
Keywords: ISO 4015:2022, hexagon head bolts with reduced shank, product grade B, metric coarse pitch threads M3–M20, fastener standards, bolt dimensions, property class.