BS EN 14399-3 HR Bolting Assemblies

Composition of high-strength structural bolting assemblies and component marking

Type of bolting assembly		System HR				System HV			System HRC
General requirements		EN 14399-1
Suitability for preloading		EN 14399-2 and, if any, additional testing specified in the product standard
Bolt and nut		EN 14399-3		EN 14399-7		EN 14 399-4		EN 14399-8	EN 14399-10
Marking	Bolt	HR8.8	HR10.9	HR8 .8	HR10.9	HV10.9		HVP10.9	HRC 10.9
	Nut	HR8 or HR10	HR10	HR8 or HR 10	HR10	HV 10		HV 10	HR 10	HRD 10
Washers		EN 1439 9-5 a or EN 14399-6				EN 14399-6				EN 14399-5 8 or EN 14399-6
Marking		H or HRb				H or HV b			H or HRb	H or HRb or HD c
Direct tension indicator and nut face washer or bolt face washer, if any		EN 14399-9							Not applicable
Marking	Direct tension indicator	H8	H10	H8	H10	H10
	Nut face washer	HN				HN
	Bolt face washer	HB		Not applicable		HB
a EN 14399-5 can on ly be used under the nu t. b At the choice of the manufacturer. c Manda tory mark for washers with en larged outer d iame ter according to EN 14399-5 only

EN 10269 Mechanical Properties

Proof load values of nuts

Thread (d)	Nominal stress area of standard test m and re l As	Property class
		8	10
		Tolerance class 6H to 6AZ	Tolerance class 6H to 6AZ
	mm2	Proof load (As × Sp) , N
	M12	84,3	84300	97800
(M14)	115	115000	133400
M16	157	157000	182100
(M18)	192	192000	222700
M20	245	245000	284200
M22	303	303000	351200
M24	353	353000	409500
M27	459	459000	532400
M30	561	561000	650800
M36	817	817000	947700
NOTE The proof load values are based on the fo l lowing stress under proof load (Sp) : - for nuts of property class 8 : 1 000 N /mm2 - for nuts of property class 1 0 : 1 1 60 N /mm2

Hardness values of nuts

Nut	Hardness limits
Property class 8 , tolerance class 6H	As specified in EN ISO 898-2 for property class 8
Property class 10 , tolerance class 6H or 6AZ	As specified in EN ISO 898-2 for property class 10
Property class 8 , tolerance class 6AZ, hot dip galvanized	260 HV to 353 HV (24 HRC to 36 HRC)

BS EN 14399-3 Dimensions

Dimensions of bolts

Thread(d)			M12		(M14)a		M16		(M18)a		M20
Pb			1,75		2		2		2,5		2,5
b(ref.)		c	30		34		38		42		46
		d	-		40		44		48		52
		e	-		-		-		-		65
c		max.	0,8		0,8		0,8		0,8		0,8
		min.	0,4		0,4		0,4		0,4		0,4
da		max.	15,2		17,2		19,2		21,7		24,4
ds		max.	12,70		14,70		16,70		18,70		20,84
		min.	11,30		13,30		15,30		17,30		19,16
d		max.	f		f		f		f		f
		min.	20,1		22,0		24,9		27,7		29,5
e		min.	23,91		26,17		29,56		32,95		35,03
k		nom.	7,5		8,8		10		11,5		12,5
		max.	7,95		9,25		10,75		12,40		13,40
kw		min.	7,05		8,35		9,25		10,60		11,60
		min.	4,90		5,85		6,50		7,42		8,10
r		min.	1,2		1,2		1,2		1,5		1,5
s		max.	22		24		27		30		32
		min.	21,16		23,16		26,16		29,16		31,00
l			ls and lg g , h
			ls	lg	ls	lg	ls	lg	ls	lg	ls	lg
nom.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
35	33,75	36,25	-	7
40	38,75	41,25	-	7			-	8
45	43,75	46,25	6,25	15			-	8
50	48,75	51,25	11,25	20	-	8	-	8			-	10
55	53,5	56,5	16,25	25	11	21	-	8			-	10
60	58,5	61,5	21,25	30	16	26	12	22	-	10	-	10
65	63,5	66,5	26,25	35	21	31	17	27	10,5	23	-	10
70	68,5	71,5	31,25	40	26	36	22	32	15,5	28	11,5	24
75	73,5	76,5	36,25	45	31	41	27	37	20,5	33	16,5	29
80	78,5	81,5	41,25	50	36	46	32	42	25,5	38	21,5	34
85	83,25	86,75	46,25	55	41	51	37	47	30,5	43	26,5	39
90	88,25	91,75	51,25	60	46	56	42	52	35,5	48	31,5	44
95	93,25	96,75	56,25	65	51	61	47	57	40,5	53	36,5	49
100	98,25	101,75	61,25	70	56	66	52	62	45,5	58	41,5	54

Thread(d)			M22		M24		M27		M30		M36
Pb			2,5		3		3		3,5		4
b(ref.)		c	50		54		60		66		78
		d	56		60		66		72		84
		e	69		73		79		85		97
c		max.	0,8		0,8		0,8		0,8		0,8
		min.	0,4		0,4		0,4		0,4		0,4
da		max.	26,4		28,4		32,4		35,4		42,4
ds		max.	22,84		24,84		27,84		30,84		37,00
		min.	21,16		23,16		26,16		29,16		35,00
d		max.	f		f		f		f		f
		min.	33,3		38,0		42,8		46,6		55,9
e		min.	39,55		45,20		50,85		55,37		66,44
k		nom.	14		15		17		18,7		22,5
		max.	14,90		15,90		17,90		19,75		23,55
kw		min.	13,10		14,10		16,10		17,65		21,45
		min.	9,2		9,9		11,3		12,4		15,0
r		min.	1,5		1,5		2,0		2,0		2,0
s		max.	36		41		46		50		60
		min.	35,0		40,0		45,0		49,0		58,8
l			ls and lg g , h
			ls	lg	ls	lg	ls	lg	ls	lg	ls	lg
nom.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
50	48,75	51,25	-	10
55	53,5	56,5	-	10
60	58,5	61,5	-	10	-	12	-	12
65	63,5	66,5	-	10	-	12	-	12
70	68,5	71,5	-	10	-	12	-	12	-	14
75	73,5	76,5	12,5	25	-	12	-	12	-	14
80	78,5	81,5	17,5	30	-	12	-	12	-	14
85	83,25	86,75	22,5	35	16	31	-	12	-	14	-	16
90	88,25	91,75	27,5	40	21	36	15	30	-	14	-	16
95	93,25	96,75	32,5	45	26	41	20	35	-	14	-	16
100	98,25	101,75	37,5	50	31	46	25	40	16,5	34	-	16
110	108,25	111,75	47,5	60	41	56	35	50	26,5	44	-	16
120	118,25	121,75	57,5	70	51	66	45	60	36,5	54	22	42
130	128	132	61,5	74	55	70	49	64	40,5	58	26	46
140	138	142	71,5	84	65	80	59	74	50,5	68	36	56
150	148	152	81,5	94	75	90	69	84	60,5	78	46	66
160	156	164	91,5	104	85	100	79	94	70,5	88	56	76
170	166	174			95	110	89	104	80,5	98	66	86
180	176	184			105	120	99	114	90,5	108	76	96
190	186	194			115	130	109	124	100,5	118	86	106
200	196	204			125	140	119	134	110,5	128	96	116
NOTE 1 : Preferred leng ths are defined in terms of leng ths ls ,m in and lg ,max. a Non-preferred sizes. b P is the p i tch of thread. c For leng ths lnom ≤ 1 25 mm. d For leng ths 1 25 mm > lnom ≤ 200 mm. e For leng ths lnom < 200 mm. f dw,max = s actua l g lg ,max = lnom - b ls ,m in = lg ,max - 5P h When ls ,m in as ca lcu lated by the formu la in g is less than 0 , 5d then the bol ts be fu l ly threaded , and in th is case lg ,max is equa l to amax as specified in ISO 3508 for product grade C , i .e . 4P. Fu l ly threaded bolts are shown above the stepped l ine

Dimensions of nuts

Thread(d)		M12	(M14)a	M16	(M18)a	M20	M22	M24	M27	M30	M36
Pb		1,75	2	2	2,5	2,5	2,5	3	3	3,5	4
da	max.	13,0	15,1	17,3	19,5	21,6	23,7	25,9	29,1	32,4	38,9
	min.	12	14	16	18	20	22	24	27	30	36
dw	max.	c	c	c	c	c	c	c	c	c	c
	min.	20,10	21,86	24,90	27,70	29,50	33,30	38,00	42,80	46,60	55,90
e	min.	23,91	27,12	29,56	32,95	35,03	39,55	45,20	50,85	55,37	66,44
m	max.	10,8	12,8	14,8	15,8	18,0	19,4	21,5	23,8	25,6	31,0
	min.	10,37	12,10	14,10	15,10	16,90	18,10	20,20	22,50	24,30	29,40
mw	min.	8,3	9,7	11,3	12,1	13,5	14,5	16,2	18,1	19,5	22,4
c	max.	0,8	0,8	0,8	0,8	0,8	0,8	0,8	0,8	0,8	0,8
	min.	0,4	0,4	0,4	0,4	0,4	0,4	0,4	0,4	0,4	0,4
s	max.	22	24	27	30	32	36	41	46	50	60
	min.	21,16	23,16	26,16	29,16	31,00	35,00	40,00	45,00	49,00	58,80
t		0,38	0,42	0,47	0,52	0,58	0,63	0,72	0,80	0,87	1,05
a Non -preferred sizes. b P is the p i tch of thread. c dw,max = s actua l.

Specifications and Reference standards

Specifications for bolts and reference standards

Material		Steel
General requirements		EN14399-1 and EN14399-2
Thread	Tolerance class	6ga
	International Standards	ISO261,ISO965-2
Mechanical properties	Property class	8.8 or 10.9
	European Standard	EN ISO 898-1
Tolerances	Product grade	C except for dimensions c and r. Tolerance for lengths ≥ 160mm: ±4,0mm
	European Standard	ENISO4759-1
Finish-Coatingb	Uncoated	Asprocessedc
	Hot dip galvanized	EN ISO 10684
	Others	To bea greedd
Surface integrity		Limits for surface discontinuities as specifiedin EN26157-1.
Acceptability		For acceptance procedure,see EN ISO 3269.
a The tolerance class specified applies to bolts without or before any coating . Hot-dip galvan ized bolts are in tended for assemb ly with nuts tapped oversize to 6AZ. b Attention is d rawn to the need to consider the risk of hydrogen embri ttlemen t in the case of bolts of property class 1 0 . 9 , when se lecting an appropria te su rface treatment process (e . g . clean ing and coating ) , see the relevant coating standards. c “As processed ” means the normal finish resu l ting from manufacture with a light coating of oil. d Other coatings may be negotiated be tween the purchaser and the manufacturer provided they do not impair the mechanical properties or the functional characteristics . coatings of cadmium or cadmium a l loy are not permitted .

Specifications for nuts and reference standards

Material		Steel
General requirements		EN 14399-1 and EN 4399-2
Thread	Coating of the bolt	Uncoated	Hot dip galvanized	Others
	Tolerance class of the nut	6H	6AZ	6Ha
	International Standards	ISO 261 , ISO 965-2	ISO 261 , ISO 965-2	ISO 261 , ISO 965-2 , ISO 965-5
Mechanical properties	Property class	8 b or 10 b
	European Standard	EN ISO 898-2
Tolerances	Product grade	B except for dimensions m and c
	European Standard	EN ISO 4759-1 c
Finish-Coatingb	Uncoated	As processedd
	Hot dip galvanized	EN ISO 10684
	Others	To be agreede
Surface integrity		Limits for surface discontinuities as specified in EN ISO 61 57-2
Acceptability		For acceptance procedure , see EN ISO 3269 .
a For other coatings that need an increased fundamental deviation and according to the relevant standard , oversize tapped nuts with a thread tolerance class up to 6AZ may be used. b For mechanical properties other than those specified in EN ISO 898-2 , for proof load values for hardness values. c Except tolerance on perpendicularity of bearing face , see tolerance t d “As processed ” means the normal finish resulting from manufacture with a light coating of oil. e Other coatings may be negotia ted be tween the purchaser and the manufacturer provided they do not impair the mechanical properties or the functional characteristics . coatings of cadmium or cadmium alloys are not permitted.

BS EN 14399-3 Bolting Surface Treatment Specifications

BS EN 14399-3 Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

BS EN 14399-3 Supplementary Requirements