EN 14399-3 Preload bolt assemblies (HR)
High-strength structural bolting assemblies for preloading
Previously know as High Strength Friction Grip (HSFG)
We are a manufacturer of CE Marked pre-loaded fasteners to EN 14399. In our facility in Leeds, we can CE Approve – assembly test to EN 14399-2 HR Assemblies from M12 to M36 up to grade 10.9. We are regularly independently assessed by LRQA, to make sure, that our company is fully comliant with EN 14399 requirements.
Typical assemblies to EN 14399 include hexagon head bolt (HR Bolt) to EN 14399-3, hexagon nut to EN 14399-3 and hard washer to EN 14399-5 (used under nut) or EN 14399-6 (usually used under bolt head). Additionally, for full compliance with k-Class k0, our company supply Direct Tensions Indicator washers to EN 14399-9. For grade 10.9 assemblies, together with DTI washers supplied are hard washers (bolt face or nut face washers) to EN 14399-9 which are used on top of the DTI washer.
EN 14399-9 DIRECT TENSION INDICATORS (DTI)
Direct tensions indicator washers (DTI) to EN 14399-9 are supplied with k-Class k0 HR assemblies. DTI washers are used during tightening of the assemblies, to ensure, that correct force for pre-loaded fasteners is achieved. DTI washers reduce necessary to use Torque figures and risk of over tightening of the assemblies.
EN 14399-7 COUNTERSUNK BOLTS (HR CSK)
We are approved to supply CE Marked Countersunk head assemblies. These assemblies include Countersunk slotted round head bolt (90-degree angle) to EN 14399-7 together with Hexagon head nut to EN 14399-7/3 and washers to EN 14399-5/6. HR CSK assemblies are tested according to EN 14399-2 requirements and CE Marked. Assemblies to k-Class k0 supplied are with DTI washers to EN 14399-9 and nut face washers to EN 14399-9 (for grade 10.9).
We are offering CE pre-loaded assemblies HR and HR CSK from M12 up to M36 with shortest lead time on the market and possibility to manufacture assemblies based on customer requirements to specified length and grade.
| Description | Specification | Size range | Availability | |
| Hexagon Bolts (HR) | EN 14399 Part 3 Alternative to BS 4395-1 4395-2 ASTM A325M & ASTM A490M, DIN 6914 | M12 – M36 | ||
| Hexagon Nut – fullnut (HR) | EN 14399 Part 3 & 7 Alternative to BS 4395-1 4395-2, ASTM A563M, DIN 6915 | M12 – M36 | ||
 HR AssemblyHexagon Bolt, Nut, Washer | EN 14399-1 Bolt assembly for preloading for use in accordance with a defined k-class | M12 – M36 | ||
| Countersunk Bolts (HR) | EN 14399 Part 7 | M12 – M36 | ||
| HR CSK Assembly Countersunk bolt, Nut, Washer | EN 14399-1 Bolt assembly for preloading for use in accordance with a defined k-class | M16 – M30 | ||
| Hardened Washers min. 300 HV | EN 14399 Part 5 & 6 Alternative to BS 4395 PT1 & PT2, ASTM A436M, DIN 6916 & 6917 & 6918 | M12 – M36 | ||
| Bolt Face / Nut Face Washers | EN 14399 Part 9 Alternative to BS 7644-2 | M12 – M36 | ||
| Direct Tension Indicators Washers (DTI Washers) | EN 14399 Part 9 Alternative to BS 7644-1, ASTM F959M | M12 – M36 | ||
Size range available
| Diameter: | M12 | (M14) | M16 | (M18) | M20 | M22 | M24 | M27 | M30 | M36 |
() - These sizes are rarely available and are made on special request (min. 1 pallet quantity may be required).
Thread Classes
| EN 14399-3 Hexagon Head Bolt | 6g | EN 14399-3 Nut EN 14399-7 Nut | S/C, BZP | HDG | SHER* |
| EN 14399-7 Countersunk Bolt | 6H | 6AZ | 6AZ |
- Recommendation of the sherardizer
Finishes available
| Finish | Specification |
| S/C Self Colour | Bare / Blackened (Black Oxide) Lightly Oiled |
| HDG Hot Dip Galvanised | EN ISO 10684 EN 1461 BS 7371 Part 6 |
| SHER / SHERA Sherardized Vapour galvanising | EN ISO 17668 EN 13811 BS 7371 Part 8 BS 4921 |
| BZP Bright Zinc Plated | EN ISO 4042 BS 7371 Part 3 |
| MZP Mechanical Applied Coating (Galvanized/Zinc) | BS 7371 Part 7 |
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- EN 14399 Pre-load Countersunk Bolt Assembly (CE Marked) Self Colour
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- EN 14399 Pre-load Countersunk Bolt Assembly (CE Marked) Galvanised
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- EN 14399 Pre-load Countersunk Bolt Assembly (CE Marked) Galvanised
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- EN 14399 Pre-load Bolt Assembly (CE Marked) Bolt to EN 14399-3, Nut to EN 14399-3, Washer to EN 14399-6 Direct Tension Indicators Washer EN 14399-9 Assembly Tested to EN 14399-2 Andrews Fasteners Limited
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- EN 14399 Pre-load bolt assembly HR BZP
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- EN 14399 Pre-load Bolt Assembly (CE Marked) Bolt to EN 14399-3, Nut to EN 14399-3, Washer to EN 14399-6 Direct Tensions Indicators Washer to EN 14399-9 Assembly Tested to EN 14399-2 Andrews Fasteners Limited
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- EN 14399 Pre-load Bolt Assembly (CE Marked) Bolt to EN 14399-3, Nut to EN 14399-3, Washer to EN 14399-6 Assembly Tested to EN 14399-2 Andrews Fasteners Limited
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- EN 14399 Pre-load bolt assembly HR BZP
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- EN 14399 Pre-load Bolt Assembly (CE Marked) Bolt to EN 14399-3, Nut to EN 14399-3, Washer to EN 14399-6 Assembly Tested to EN 14399-2 Andrews Fasteners Limited
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- EN 14399 Part 7 Countersunk Head Bolt FAST 10.9 HR
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- EN 14399 Pre-load Countersunk Bolt Assembly (CE Marked) Self Colour
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- EN 14399 Pre-load bolt head marking
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- M30 HR 14399-3 Nut Galvanised (HDG)
Looking for ASTM Alternative (A325M, A490M, A563M, F436M)?
Look in our comparison article to EN 14399 Pre-load bolt assemblies.