At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to BS EN 14399-10. Part 10 of the EN 14399 series: high-strength structural bolting assemblies for preloading – System HRC, bolt and nut assemblies with CALIBRATED PRELOAD. Specifies the HRC assembly (typically a hexagon bolt with a splined end sheared off by a special wrench, or hex, plus nut and washer) that achieves preload via a calibrated tool. Property classes 10.9 (and 8.8). Used with EN 14399-1 and -6 washers.
Part 10 of the EN 14399 series: high-strength structural bolting assemblies for preloading – System HRC, bolt and nut assemblies with CALIBRATED PRELOAD. Specifies the HRC assembly (typically a hexagon bolt with a splined end sheared off by a special wrench, or hex, plus nut and washer) that achieves preload via a calibrated tool. Property classes 10.9 (and 8.8). Used with EN 14399-1 and -6 washers.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| HRC 10.9 | Alloy steel, Q&T | Calibrated-preload assembly (spline/twist-off), class 10.9 – most common |
| HRC 8.8 | Carbon-boron/alloy steel, Q&T | Calibrated-preload assembly, class 8.8 |
Minimum mechanical requirements per BS EN 14399-10.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Bolt class 10.9 | 1040 MPa (151 ksi) | 940 MPa (136 ksi) | 9 | 320-380 HV |
| Bolt class 8.8 | 800 MPa (116 ksi) | 640 MPa (93 ksi) | 12 | 250-320 HV |
| Nut class 10 | Proof 1040 MPa (151 ksi) | n/a (nut) | n/a | <=353 HV |
| Nut class 8 | Proof 800 MPa (116 ksi) | n/a (nut) | n/a | <=302 HV |
| Grade | Key Composition, % |
|---|---|
| Class 10.9 | Alloy steel (Cr/Mo/B), quenched & tempered per ISO 898-1 |
| Class 8.8 | Carbon-boron or alloy steel, quenched & tempered |
Bolt/nut mechanicals per ISO 898-1/898-2. Functional analogue to ASTM F3125/F2280 (A490 twist-off) and ASTM F3148 (144 ksi twist-off). Companion to EN 14399-3 (HR system).
For the official BSI standards catalogue, see the BSI standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply BS EN 14399-10 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Part 10 of the EN 14399 series: high-strength structural bolting assemblies for preloading – System HRC, bolt and nut assemblies with CALIBRATED PRELOAD. Specifies the HRC assembly (typically a hexagon bolt with a splined end sheared off by a special wrench, or hex, plus nut and washer) that achieves preload via a calibrated tool. Property classes 10.9 (and 8.8). Used with EN 14399-1 and -6 washers.
Ananka Fasteners supplies HRC 10.9, HRC 8.8 to BS EN 14399-10. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply BS EN 14399-10 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to BS EN 14399-10 for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: BS EN 14399-10 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per BS EN 14399-10 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
