Manufactured under strict ISO, ASTM, DIN, and ASME specifications with 100% heat-traceable Mill Test Certificates (MTC EN 10204 3.1).
A technical guide for engineering procurement directors and pipeline system designers on selecting full-thread hexagon head screws.
ISO 4017 establishes standard dimensional tolerances for hexagon head screws with full-length threading up to the bearing face of the head. Unlike ISO 4014 (partially threaded), ISO 4017 eliminates the unthreaded shank, accommodating blind tapped holes, compact machine flanges, and dynamic structural clamping.
A critical divergence between classic DIN 933 and modernized ISO 4017 resides in the Width Across Flats (s-dimension) for sizes M10, M12, M14, and M22. M10 moves from 17mm to 16mm; M12 from 19mm to 18mm; and M14 from 22mm to 21mm. Engineering procurement teams must align tooling and socket tolerances during transition.
Our ISO 4017 fastener forgings utilize automated multi-station cold-heading up to M24 and high-temperature induction forging for larger metric diameters up to M100. This hot/cold manufacturing maintains continuous grain flow lines around the transition radius beneath the bolt head, reducing stress notch fatigue.
| Nominal Size (Thread d) | Pitch (P) Standard | DIN 933 WAF (s) | ISO 4017 WAF (s) | Head Height (k) ISO | Proof Stress (Class 8.8) | Tensile Strength (Class 10.9) |
|---|---|---|---|---|---|---|
| M8 | 1.25 mm | 13.0 mm | 13.0 mm | 5.30 mm | 580 MPa | 1040 MPa |
| M10 | 1.50 mm | 17.0 mm | 16.0 mm (Standard Shift) | 6.40 mm | 580 MPa | 1040 MPa |
| M12 | 1.75 mm | 19.0 mm | 18.0 mm (Standard Shift) | 7.50 mm | 580 MPa | 1040 MPa |
| M16 | 2.00 mm | 24.0 mm | 24.0 mm | 10.00 mm | 600 MPa | 1040 MPa |
| M20 | 2.50 mm | 30.0 mm | 30.0 mm | 12.50 mm | 600 MPa | 1040 MPa |
| M24 | 3.00 mm | 36.0 mm | 36.0 mm | 15.00 mm | 600 MPa | 1040 MPa |
When pairing ISO 4017 bolts with ASME B16.5, ASME B16.47, or EN 1092-1 forged flanges, full-thread engagement ensures maximum clamping stress retention without bottoming out the thread runout. Always specify matched nuts (ISO 4032 / DIN 934 / ASTM A194 Gr. 8M) to prevent dissimilar metal galling or thread stripping under thermal cycling.
Market forces shaping global fastener supply chains, green metallurgy, anti-corrosion chemistry, and high-tensile metallurgy.
Global procurement teams are shifting away from single-source dependencies. Industrial hubs in India, backed by verified PED approvals and comprehensive metallurgical raw-material supply chains, are becoming the primary supply origin for infrastructure, LNG, and deep-sea energy developments across EMEA and the Americas.
Traditional hot-dip galvanizing is increasingly complemented by thin-film zinc-flake systems (ISO 10683) and fluoropolymer (PTFE/Xylan) coatings. These chemistries prevent hydrogen embrittlement in Property Class 10.9 and 12.9 fasteners while providing over 1,500 hours of salt spray test (ASTM B117) resistance without thread clearance interference.
Strict European and American environmental mandates require transparent material passports. Manufacturers must provide digital EN 10204 3.1 certification, complete heat melt tracking, mechanical verification, and verifiable product carbon footprint (Scope 1, 2, and 3 emissions data) directly to port customs authorities.
A certified Indian manufacturer and international exporter delivering engineering fasteners and forged flange systems.
Fully compliant with the European Pressure Equipment Directive (PED 2014/68/EU). As an active member of the Fastener Manufacturers Association of India (FMAI), our facilities run under rigorous continuous improvement quality audits.
Every production lot undergoes non-destructive testing (MPI, UT), spectrographic chemical analysis, proof-load verification, micro-hardness charting, and Charpy V-notch impact testing for sub-zero cryogenic applications down to -196°C.
Beyond commercial 8.8, 10.9, and 12.9 alloy steels and SS304/SS316, our forge handles exotic metallurgy including ASTM A193 B7/B8/B8M, Duplex 2205, Super Duplex 2507, Inconel 625/718, Monel 400, Titanium Grade 5, and specialized marine bronzes.
Direct technical answers addressing thread pitch, mechanical property testing, export documentation, and surface coating selection.
ISO 4017 covers hexagon head screws that are fully threaded from the point to the underside of the head, designed specifically for blind tapped holes or variable clamping configurations. ISO 4014 features a smooth, unthreaded shank between the head and the threaded portion, designed for shear-load resistance across joint interfaces.
Yes, in most diameters they are functionally identical. However, for diameters M10, M12, M14, and M22, the Width Across Flats (WAF) differs by 1 mm between DIN and ISO standards. Ensure socket tool clearance and maintenance tooling accommodate ISO wrench dimensions before executing plant-wide replacement.
Every shipment is accompanied by a certified EN 10204 Type 3.1 Inspection Certificate. This includes ladle chemical composition, room and elevated temperature tensile strength, yield stress, elongation percentage, core and surface hardness, impact toughness test results, and surface coating thickness reports.
Hot-dip galvanizing adds 45–65 microns of protective zinc coating. To maintain smooth assembly without destroying corrosion protection, bolts are matched with internal nuts tapped with oversize pitch diameters (tolerance class 6AZ or 6AX per ISO 965-5). Chasing external bolt threads after coating is prohibited.
We supply ISO 3506-1 austenitic stainless steel bolts in grades A2-70, A2-80, A4-70, and A4-80 (molybdenum-bearing AISI 316 for chloride exposure). For aggressive marine splash zones, we also manufacture ISO 4017 geometry in 254SMO, Duplex 2205, and Super Duplex 2507 to eliminate pitting and crevice corrosion.
Standard metric sizes (M6 through M36) in property classes 8.8, 10.9, and A2/A4 are stocked for prompt shipment within 7 business days. Custom forgings up to M100, specialized head markings, non-standard lengths, or exotic superalloys generally run on a 3 to 4-week production cycle with flexible MOQs.
Connect directly with our engineering sales desk for complete dimensional catalogs, comprehensive material property datasheets, and real-time mill export quotations.