BS EN 14399-3 Hexagon bolting assemblies for preloading (HR)

Previously known as High Strength Friction Grip (HSFG)

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 HR Assemblies from M12 to M36 up to grade 10.9. We are regularly independently assessed by Lloyd’s Register / LRQA, to make sure, that our company is fully compliant with BS EN 14399 requirements.

Typical assemblies to BS EN 14399 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.

BS EN 14399-7 Countersunk Bolts (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).

We are offering UKCA & CE pre-loaded assemblies HR from M12 up to M36 and 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 k-Class k0 HR and HR CSK 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.

Description	Specification	Size range
Hexagon Bolts (HR)	BS EN 14399-3 Alternative to BS 4395-1, BS 4395-2, ASTM A325M & ASTM A490M, DIN 6914	M12–M36
Hexagon Nut – fullnut (HR)	BS EN 14399-3 & 14399-7 Alternative to BS 4395-1, BS 4395-2, ASTM A563M, DIN 6915	M12–M36
HR 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 (HR)	BS EN 14399-7	M12–M36
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 Washers)	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 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