Andrews Fasteners Ltd

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	Ask	Quote
Hexagon Nut – fullnut (HR)	EN 14399 Part 3 & 7 Alternative to BS 4395-1 4395-2, ASTM A563M, DIN 6915	M12 – M36	Ask	Quote
HR Assembly Hexagon Bolt, Nut, Washer	EN 14399-1 Bolt assembly for preloading for use in accordance with a defined k-class	M12 – M36	Buy Online	Quote
Countersunk Bolts (HR)	EN 14399 Part 7	M12 – M36	Ask	Quote
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	Buy Online	Quote
Hardened Washers min. 300 HV	EN 14399 Part 5 & 6 Alternative to BS 4395 PT1 & PT2, ASTM A436M, DIN 6916 & 6917 & 6918	M12 – M36	Buy Online	Quote
Bolt Face / Nut Face Washers	EN 14399 Part 9 Alternative to BS 7644-2	M12 – M36	Ask	Quote
Direct Tension Indicators Washers (DTI Washers)	EN 14399 Part 9 Alternative to BS 7644-1, ASTM F959M	M12 – M36	Buy Online	Quote

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

Looking for ASTM Alternative (A325M, A490M, A563M, F436M)?

Look in our comparison article to EN 14399 Pre-load bolt assemblies.

• BS EN 14399 (HSFG) compare as an alternative to ASTM HSFG