EN 14399 Specification-HIGH-STRENGTH STRUCTURAL BOLTING ASSEMBLIES FOR PRELOADING

2022-06-08

EN 14399 Specification

HIGH-STRENGTH structural BOLTING ASSEMBLIES FOR PRELOADING

Structural bolting in Europe comprises two technical solutions to achieve the necessary ductility of Bolt/nut/washer assemblies. These solutions utilize different systems (HR and HV) of bolt/nut/Washer assemblies, see table below. Both systems are well proved and it is up to the experts responsible for structural bolting whether they use the one or the other system.

Items	Bolt/Nut/Washer Assembly	Bolt/Nut/Washer Assembly
System	System HR	System HV
General Requirements	EN 14399-1
Bolt/Nut Assembly	EN 14399-3	EN 14399-4
Marking	HR	HV
Property Class	8.8/8	10.9/10
Washer(s)	EN 14399-5 or EN 14399-6	EN 14399-5 or EN 14399-6
Marking	H	H
Suitability Test for	EN 14399-2
Preloading	EN 14399-2

EN 14399 PARTS 1-10

There are currently 10 parts BS EN 14399 which are listed in the table below.

BS EN 14399 Part One	General Requirements
BS EN 14399 Part Two	Suitability test for Preloading (assembly test)*
BS EN 14399 Part Three	Hexagon Bolt and Nut Assemblies (HR 8.8 and 10.9)
BS EN 14399 Part Four	Hexagon Bolt and Nut Assemblies (HV 10.9)
BS EN 14399 Part Five	Plain Washers
BS EN 14399 Part Six	Plain Chamfered Washers
BS EN 14399 Part Seven	Countersunk Bolt and Nut (HR 8.8 and 10.9)
BS EN 14399 Part Eight	Hexagon Fitted Bolt and Nut Assemblies (HV 10.9)
BS EN 14399 Part Nine	Direct Tension Indicators
BS EN 14399 Part Ten	Tension Control Bolt and Nut Assemblies (HRC 10.9)

2022-06-08_15

Note: The `8.8 HR, 10.9 HR' means that the product was manufactured to BS EN 14399-3

Note: The `10.9 HV` means that the product was manufactured to BS EN 14399-4

EN14399-3 Class 8.8HR MECHANICAL PROPERTIES BOLTS

Items	Stress Area	Proof Load	Ultimate Load	Hardness Rockwell HRC
Items	2	Min. kN	Min. kN	Hardness Rockwell HRC
Dia.	mm			Min.	Max.
M12	84.3	50.7	70	22	32
M16	157	94.5	130	22	32
M20	245	147	203	23	34
M22	303	182	252	23	34
M24	353	212	293	23	34
M27	459.33	275	381	23	34
M30	561	337	466	23	34
M36	817	490	678	23	34

EN14399-3 Class 10.9HR MECHANICAL PROPERTIES BOLTS

Items	Stress Area	Proof Load	Ultimate Load	Hardness Rockwell HRC
Items	2	Min. kN	Min. kN	Hardness Rockwell HRC
Dia.	mm			Min.	Max.
M12	84.3	70	87.7	32	39
M16	157	130	163	32	39
M20	245	203	255	32	39
M22	303	252	315	32	39
M24	353	293	367	32	39
M27	459.33	381	477	32	39
M30	561	466	583	32	39
M36	817	678	850	32	39

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