We are a manufacturer of UKCA & CE Marked pre-loaded fasteners to BS EN 14399. In our facility in Leeds, we can UKCA & CE Approve – assembly test to BS EN 14399-2 (System HR and HV) 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 compliant with BS EN 14399 requirements.
BS EN 14399-3 Hexagon bolting assemblies for preloading (System HR)
Previously known as High Strength Friction Grip (HSFG) bolting assemblies
Typical assemblies to BS EN 14399 (Systemn HR) include hexagon head bolt (HR Bolt) to BS EN 14399-3, hexagon nut to EN 14399-3 and hard washer to BS EN 14399-5 (used under the nut) or chamfered hard washer BS EN 14399-6 (usually used under bolt head).
Additionally, for full compliance with k-Class K0, our company supply Direct Tensions Indicator washers to BS EN 14399-9. For grade 10.9 assemblies, together with DTI washers supplied are hard washers (bolt face or nut face washers) to BS EN 14399-9 which are used on top of the DTI washer.
We also offer these bolting assemblies in k-Class K1 for combined method of installation and k-Class K2 for torque installation.
System HR bolting assemblies are available in grade 8.8 and 10.9.
BS EN 14399-4 Hexagon bolting assemblies for preloading (System HV)
Typical assemblies to BS EN 14399 (System HV) include hexagon head bolt (HV Bolt) to BS EN 14399-4, hexagon nut to EN 14399-4 and hard washer to BS EN 14399-5 (used under the nut) or chamfered hard washer BS EN 14399-6 (usually used under bolt head).
These bolting assemblies are available in k-Class K1, suitable for combined method of installation, and k-Class K2, for tightening with a torque wrench.
They can also be used with Direct Tensions Indicator washers to BS EN 14399-9 under k-Class K0.
System HV bolting assemblies are available in grade 10.9 only
Read more what HR & HV symbols mean and what is the Difference Between HR and HV Bolt Assemblies.
BS EN 14399-7 Countersunk Bolts (System HR, CSK)
We are approved to supply UKCA & CE Marked Countersunk head bolting assemblies. These assemblies include Countersunk slotted round head bolt (90-degree angle) to BS EN 14399-7 together with Hexagon head nut to BS EN 14399-7/3 and washers to BS EN 14399-5/6. HR CSK assemblies are tested according to BS EN 14399-2 requirements and UKCA & CE Marked. Assemblies to k-Class K0 supplied are with DTI washers to BS EN 14399-9 and nut face washers to BS EN 14399-9 (for grade 10.9).
These bolting assemblies are available in k-Class K1, suitable for combined method of installation, and k-Class K2, for tightening with a torque wrench.
We are offering UKCA & CE pre-loaded assemblies System HR and System HV from M12 up to M36 and System HR, CSK from M16 up to M30 with shortest lead time on the market and possibility to manufacture assemblies based on customer requirements to specified length and grade.
BS EN 14399-9 Direct Tension Indicators (DTI)
Direct tensions indicator washers (DTI) to BS EN 14399-9 are supplied with bolting assemblies designed for k-Class K0. 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.
Assemblies designed for k-Class K1, combined method of installation, or k-Class K2, for tightening with a torque wrench can be installed with DTI washers under k-Class K0.
Description | Specification | Size range |
---|---|---|
Hexagon Bolts (System HR) | BS EN 14399-3 Alternative to BS 4395-1, BS 4395-2, ASTM A325M & ASTM A490M, DIN 6914 | M12–M36 |
Hexagon Nut – fullnut (System HR) | BS EN 14399-3 & 14399-7 Alternative to BS 4395-1, BS 4395-2, ASTM A563M, DIN 6915 | M12–M36 |
Hexagon Bolts (System HV) | BS EN 14399-4 | M12–M36 |
Hexagon Nut – fullnut (System HV) | BS EN 14399-4 | M12–M36 |
System HR or HV Assembly Hexagon Bolt, Nut, Washer | BS EN 14399-1 Bolt assembly for preloading for use in accordance with a defined k-class | M12–M36 |
Countersunk Bolts (System HR) | BS EN 14399-7 | M12–M36 |
System HR, CSK Assembly Countersunk bolt, Nut, Washer | BS EN 14399-1 Bolt assembly for preloading for use in accordance with a defined k-class | M16 – M30 |
Hardened Washers min. 300 HV | BS EN 14399-5 & 14399-6 Alternative to BS 4395-1, BS 4395-2, ASTM A436M, DIN 6916 & 6917 & 6918 | M12–M36 |
Bolt Face / Nut Face Washers | BS EN 14399-9 Alternative to BS 7644-2 | M12–M36 |
Direct Tension Indicators Washers (DTI) | BS EN 14399-9 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
S/C, BZP | HDG | SHER* | |||
---|---|---|---|---|---|
BS EN 14399-3 Hexagon Head Bolt | 6g | BS EN 14399-3 Nut | 6H | 6AZ | 6AZ |
BS EN 14399-7 Countersunk Bolt | 6g | BS EN 14399-7 Nut | 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 ISO 1461 BS 7371-6 |
SHER / SHERA Sherardized Vapour galvanising | EN ISO 17668 EN 13811 BS 7371-8 BS 4921 |
BZP Bright Zinc Plated | EN ISO 4042 BS 7371-3 |
MZP / MG Mechanical Applied Coating (Galvanized/Zinc) | BS 7371-7 ASTM B695 |
Looking for ASTM Alternative (A325M, A490M, A563M, F436M)?
Look in our comparison article to EN 14399 Pre-load bolt assemblies.