ISO 3506-5 Fasteners

Bolting, Stud Bolts, Screws, Nuts

ISO 3506-5 specification provides the mechanical and physical properties of bolts, screws, studs and nuts, with coarse pitch thread and fine pitch thread made of corrosion-resistant stainless steels and nickel alloys, intended for use at high temperatures up to 800 °C.
ISO 3506-5 fasteners are also suitable when used at low temperatures, typically down to ‑ 50 °C. ISO 3506-5 fastener properties are in relation to three material categories viz; martensitic steels, precipitation hardening austenitic steels and nickel alloys. All grades included in ISO 3506-5 are heat-treated. Heat treatment process is crucial to reach ISO/DIS 3506-5 mechanical properties and suitable microstructure that are essential to stand phenomena described above and to get acceptable durability for the fasteners and the assembled joint.

All stainless steels and nickel alloys specified in ISO 3506-5 belong to three different categories:
• Martensitic Stainless Steels: CH0, CH1, CH2, V, VH, VW
• Precipitation Hardening Austenitic steels: SD
• Nickel Alloys: SB and 718

Common designations for cold heading

Type Of Steel/Alloy	Grade	Steel Number	Steel Designation	UNS	Trade Name
Highly alloyed austenitic	SD	1.4980	X6NiCrTiMoVB25-15-2	S66286	A286 Alloy 660
Nickel alloy	SB	2.4952	NiCr20TiAl	N07080	Alloy 80A
	718	2.4668	NiCr19NbMo	N07718	Alloy 718
General Purpose Martensitic	C1, CH0	1.4021	X20Cr13	S42000	420
	C1, CH1	1.4028	X30Cr13	S42000	420
	VW	1.4913	X19CrMoNbVN11-1	-	-
	V or VH	1.4923	X22CrMoV12-1	-	-
High chromium martensitic	C3, CH2	1.4057	X17CrNi16-2	S43100	431

ISO 3506-5 Chemical Composition

Chemical Composition For Martensitic Stainless Steel Fasteners

Fastener symbol	Material reference	ISO name for material	Chemical composition
			C	Si	Mn	P	S	Cr	Mo	Ni	N	Other elements
CH0	4021-420-00-1 a	X20Cr13	0,16 to 0,25	1,00	1,50	0,040	0,030 c	12,0 to 14,0	---	---	---	---
	1,4021 b
CH1	4028-420-00-1 a	X30Cr1 3	0,26 to 0,35	1,00	1,50	0,040	0,030 c	12,0 to 14,0	---	---	---	---
	1,4057 b
CH2	4057-431-00-X a	X17CrNi16-2	0,12 to 0,22	1,00	1,50	0,040	0,030 c	15,0 to 17,0	---	1,50 to 2,50	---	---
	1,4923 e
Vor VHd	4923-422-77-E a	X22CrMoV12-1	0,18 to 0,24	0,50	0,40 to 0,90	0,025	0,015	11,0 to 12,5	0,80 to 1,20	0,30 to 0,80	---	V 0,25 to 0,35
	1,4923 e
VW	1,4913 e	X19CrMoNbVN11-1	0,17 to 0,23	0,50	0,40 to 0,90	0,025	0,015	10,0 to 11,5	0,50 to 0,80	0,20 to 0,60	0,05 to 0,10	V 0,10 to 0,30 Nb 0,25 to 0,55 B < 0,0015 Al < 0,020 N 0,05 to 0,10
a Material reference given for information according to ISO 15510. b Material reference given for information according to EN 10088-3. c For machinability, a controlled sulfur mass fraction of 0,015% to 0,030% is recommended. d Symbol V for stress at 0,2% non-proportional elongation Rpf≥ 600 MPa, and symbol VH for Rpf≥ 700 MPa. e Material reference given for information according to EN 10262.

Chemical Composition For Precipitation Hardening Austenitic Stainless Steel Fasteners

Fastener symbol	Material reference	ISO name for material	Chemical composition
			C	Si	Mn	P	S	Cr	Mo	Ni	Ti	Other elements
SD	4980-662-86-X b	X6NiCrTiMoVB25-15-2	0,080 e	1,00	2,00	0,040	0,030	13,5 to 16,0	1,00 to 1,50	24,0 to 27,0	1,90 to 2,35	Al 0,35 V 0,10 to 0,50 B 0,001 to 0,010
	Alloy 660 UNS 566286 c
	1,4980 d		0,030 to 0,080	1,00	1,00 to 2,00	0,025	0,015	13,5 to 16,0	1,00 to 1,50	24,0 to 27,0	1,90 to 2,30	AI≤ 0,35 V: 0,10 to 0,50 B: 0,0030 to 0,010
a Secondary melting (for instance Electro-Slag Remelting) of the raw material is recommended due to the beneficial effect on the functional properties of the finished fasteners. The melting process is left to the choice of the fastener manufacturer, unless otherwise agreed. b Material reference given for information according to ISO 15510. c Material reference given for information according to ASTM A453/A453M. d Material reference given for information according to EN 10269. e A minimum carbon content may be required for specific applications.

Chemical Composition For Nickel Alloy Fasteners

Fastener symbol	Material reference	ISO name for material	Chemical composition
			C	Si	Mn	P	S	Cr	Mo	Ni	Ti	Other elements
SB	Alloy 80A UNS N07080 b	NiCr20TiAl	0,10 c	1,00	1,00	-	0, 015	18,0 to 21,0	-	Re- minder	1,80 to 2,70	AI: 0,50 to 1,80 Fe :5 3,00
	2,4952 d	NiCr20TiAl	0,040 to 0,10	1,00	1,00	0,020	0, 015	18,0 to 21,0	-	≥ 65	1,80 to 2,70	AI : 1,00 to 1,80 Fe :5 1,50 Co :5 1,00 Cu :5 0,20 B :5 0,0080
718	Alloy 718 UNS N07718 e	NiCr19NbMo	0, 0 80 c	0,35	0,35	0,015	0,015	17,0 to 21,0	2,80 to 3,30	50 to 50 to	0,65 to 1,15	Nb + Ta: 4,75 to 5,50 AI: 0,20 to 0,80 Co :5 1,00 Cu :5 0,30 B :5 0,0060
	2,4668 f	NiCr19NbMo	0,020 to 0, 080	0,35	0,35	0,015	0,015	17,0 to 21,0	2,80 to 3,30	50,0 to 55,0	0,60 to 1,20	Nb + Ta: 4,7 to 5, 5 AI: 0,30 to 0,70 Co :5 1,00 Cu :5 0,30 B :5 0,0020 to 0,0060
a Secondary melting (for instance Electro-Slag Remelting) of the raw material is recommended due to the beneficial effect on the functional properties of the finished fasteners. The melting process is left to the choice of the fastener manufacturer, unless otherwise agreed. b Material references given for information according to ASTM 8637. c A minimum carbon content may be required for specific applications. d Material references given for information according to EN 10269. e Material references given for information according to ASTM A1014. f Material references given for information according to EN 10302.

ISO 3506-5 Mechanical Properties Bolts, Screws and Studs

Properties at ambient temperature for bolts, screws and studs

Fastener symbol	Tensile strength Rmf M Pa min.	Stress at 0,2 % non-proportional elongation Rpf M Pa min.	Elongation after fracture A mm min.	Hardness HRC min. - max.	Converted hardnessa HV (F :: 98 N) min. - max.
CH0	800	600	0, 20d	22 - 32	250 - 320
CH1	850	650	0, 20d	26 - 39	270 - 380
CH2	860	690	0, 20d	25 - 32	260 - 320
V	800	600	0, 20d	22 - 32	250 - 320
VH	900	700	0, 20d	28 - 38	280 - 370
VW	900	750	0, 20d	28 - 38	280 - 370
SD	900	600	0, 25d	22 - 37	250 - 367
SB	1 0 00	600	0, 20d	32 - 42	320 - 417
718	1,230	1,030	0, 20d	36 - 48	345 - 480
a Vickers hardness are converted from HRC values by taking into account ASTM A370, ASTM A1014, ASTM F2281 and DIN 267-13.

Minimum Ultimate Tensile Loads - Coarse pitch Thread

Thread d	Nominal stress area As, n o m mm 2	Minimum ultimate tensile load, F mf N
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M3	5,03	4030	4280	4330	4030	4530	4530	4530	5040	6190
M35	6,78	5430	5760	5830	5430	6100	6100	6100	6780	8340
M4	8,78	7030	7470	7550	7030	7910	7910	7910	8780	10800
MS	14,2	11350	12060	12200	11350	12770	12770	12770	14190	17450
M6	20,1	16100	17110	17310	16100	18120	18120	18120	20130	24760
M7	28,9	23090	24540	24820	23090	25980	25980	25980	28860	35500
M8	36,6	29290	31120	31490	29290	32950	32950	32950	36610	45030
M10	58,0	46400	49300	49880	46400	52200	52200	52200	57990	71330
M12	84,3	67420	71630	72470	67420	75840	75840	75840	84270	103700
M14	115	92360	98130	99280	92360	103900	103900	103900	115500	142000
M16	157	125400	133200	134800	125400	141100	141100	141100	156700	192800
M18	192	154000	163700	165600	154000	173300	173300	173300	192500	236800
M20	245	195900	208100	210600	195900	220400	220400	220400	244800	301100
M22	303	242800	257900	261000	242800	273100	273100	273100	303400	373200
M24	353	282100	299700	303200	282100	317300	317300	317300	352600	433600
M27	459	367600	390500	395100	367600	413500	413500	413500	459500	565100
M30	561	448500	476500	482200	448500	504600	504600	504600	560600	689600
M33	694	554900	589600	596500	554900	624200	624200	624200	693600	853100
M36	817	653400	694300	702400	653400	735100	735100	735100	816800	1004600
M39	976	780700	829400	839200	780700	878200	878200	878200	975800	1200200
Fmf,min = As, nom x Rmf,min· For the calculation of As,nom. The load values are calculated by using the exact data for A5, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

Minimum loads at Rpf at ambient temperature - Coarse pitch thread

Thread d	Nominal stress area As, nom mm2	Minimum load at 0,2 % non-proportional elongation, Fpf
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M3	5,03	3020	3280	3480	3020	3530	3780	3020	3020	5190
M3,5	6,78	4070	4410	4680	4070	4750	5090	4070	4070	6980
M4	8,78	5270	5710	6060	5270	6150	6590	5270	5270	9050
M5	14,2	8510	9220	9790	8510	9930	10640	8510	8510	14610
M6	20,1	12080	13090	13890	12080	14090	15100	12080	12080	20730
M7	28,9	17320	18760	19920	17320	20210	21650	17320	17320	29730
M8	36,6	21970	23800	25260	21970	25630	27460	21970	21970	37710
M10	58,0	34800	37700	40020	34800	40600	43500	34800	34800	59730
M12	84,3	50560	54780	58150	50560	58990	63200	50560	50560	86800
M 14	115	69270	75040	79660	69270	80810	86580	69270	69270	119000
M16	157	94010	101900	108200	94010	109700	117600	94010	94010	161400
M18	192	115500	125200	132900	115500	134800	144400	115500	115500	198300
M20	245	146900	159200	169000	146900	171400	183600	146900	146900	252200
M22	303	182100	197300	209400	182100	212400	227600	182100	182100	312600
M24	353	211600	229200	243300	211600	246800	264400	211600	211600	363100
M27	459	275700	298700	317000	275700	321600	344600	275700	275700	473200
M30	561	336400	364400	386900	336400	392500	420500	336400	336400	577500
M33	694	416200	450900	478600	416200	485500	520200	416200	416200	714400
M36	817	490100	530900	563600	490100	571800	612600	490100	490100	841300
M39	976	585500	634300	673300	585500	683100	731900	585500	585500	1005100
Fpf,min = As,nom x Rpf,min· For the calculation of As,nom. The load values are calculated by using the exact data for As, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

Minimum ultimate tensile loads at ambient temperature - Fine pitch thread

Thread dxP	Nominal stress area A m s, n o mm2	Minimum ultimate tensile load, F mf N
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M8x1	39,2	31340	33300	33690	31340	35260	35260	35260	39170	48180
M10x1,25	61,2	48960	52020	52640	48960	55080	55080	55080	61200	75280
M10 x1,0	64,5	51600	54820	55470	51600	58050	58050	58050	64500	79330
M12 x1,5	88,1	70510	74910	75790	70510	79320	79320	79320	88130	108400
M12 x1,25	92,1	73660	78270	79190	73660	82870	82870	82870	92080	113300
M14x1,5	125	99640	105900	107200	99640	112100	112100	112100	124600	153200
M16x1,5	167	133800	142200	143900	133800	150600	150600	150600	167300	205800
M18x1,5	216	173000	183800	186000	173000	194700	194700	194700	216300	266000
M20x1,5	272	217300	230800	233500	217300	244400	244400	244400	271600	334000
M22 x1,5	333	266500	283100	286500	266500	299800	299800	299800	333100	409700
M24x2	384	307600	326800	330600	307600	346000	346000	346000	384500	472900
M27x2	496	396600	421400	426400	396600	446200	446200	446200	495800	609800
M30x2	621	497000	528100	534300	497000	559100	559100	559100	621300	764100
M33x2	761	608700	646700	654300	608700	684800	684800	684800	760800	935800
M36x3	865	692000	735200	743900	692000	778500	778500	778500	865000	1063900
M39x3	1030	822800	874200	884500	822800	925600	925600	925600	1028400	1265000
Fpf,min = As,nom x Rpf,min· For the calculation of As,nom. The load values are calculated by using the exact data for As, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

Minimum loads at Rpt at ambient temperature - Fine pitch thread

Thread dxP	Nominal stress area As, nom mm2	Minimum load at 0,2 % non-proportional elongation, Fpr N
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M8x1	39,2	23510	25460	27030	23510	27420	29380	23510	23510	40350
M10x1,25	61,2	36720	39780	42230	36720	42840	45900	36720	36720	63040
M10x1,0	64,5	38700	41930	44510	38700	45150	48380	38700	38700	66430
M12x1,5	88,1	52880	57290	60810	52880	61690	66100	52880	52880	90770
M12x1,25	92,1	55250	59850	63530	55250	64460	69060	55250	55250	94840
M14x1,5	125	74730	80960	85940	74730	87190	93410	74730	74730	128300
M16x1,5	167	100400	108800	115500	100400	117100	125500	100400	100400	172300
M18x1,5	216	129800	140600	149300	129800	151400	162200	129800	129800	222800
M20x1,5	272	163000	176500	187400	163000	190100	203700	163000	163000	279700
M22x1,5	333	199900	216500	229900	199900	233200	249800	199900	199900	343100
M24x2	384	230700	249900	265300	230700	269100	288400	230700	230700	396000
M27x2	496	297500	322300	342100	297500	347100	371900	297500	297500	510700
M30x2	621	372800	403800	428700	372800	434900	466000	372800	372800	639900
M33x2	761	456500	494600	525000	456500	532600	570600	456500	456500	783700
M36x3	865	519000	562300	596900	519000	605500	648800	519000	519000	890900
M39x3	1030	617100	668500	709600	617100	719900	771300	617100	617100	1059300
Fpf,min = As,nom x Rpf,min· For the calculation of As,nom. The load values are calculated by using the exact data for As, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

ISO 3506-5 Mechanical properties of Nuts

Hardness for Nuts at ambient temperature

Fastener symbol	Stress under proof load, Sp M Pa	Hardness HRC min. - max.	Converted hardnessa HV (F ≥ 98 N) min. - max
CH0	800	22 - 32	250 - 320
CH1	850	26 - 39	270 - 380
CH2	860	25 - 32	260 - 320
V	800	22 - 32	250 - 320
VH	900	28 - 38	280 - 370
VW	900	28 - 38	280 - 370
SD	900	22 - 37	250 - 367
SB	1000	32 - 42	320 - 417
718	1230	36 - 48	345 - 480
a Vickers hardness are converted from H RC values by taking into account ASTM A370, ASTM A1014, ASTM F2281 and DIN 267-13.

Proof load values for nuts at ambient temperature - Coarse pitch thread

Thread D	Nominal stress area A s,nom mm 2	Proof load, Fp N
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M5	14,2	11350	12060	12200	11350	12770	12770	12770	14190	17450
M6	20,1	16100	17110	17310	16100	18120	18120	18120	20130	24760
M7	28,9	23090	24540	24820	23090	25980	25980	25980	28860	35500
MS	36,6	29290	31120	31490	29290	32950	32950	32950	36610	45030
M10	58,0	46400	49300	49880	46400	52200	52200	52200	57990	71330
M12	84,3	67420	71630	72470	67420	75840	75840	75840	84270	103700
M14	115	92360	98130	99280	92360	103900	103900	103900	115500	142000
M16	157	125400	133200	134800	125400	141100	141100	141100	156700	192800
M18	192	154000	163700	165600	154000	173300	173300	173300	192500	236800
M20	245	195900	208100	210600	195900	220400	220400	220400	244800	301100
M22	303	242800	257900	261000	242800	273100	273100	273100	303400	373200
M24	353	282100	299700	303200	282100	317300	317300	317300	352600	433600
M27	459	367600	390500	395100	367600	413500	413500	413500	459500	565100
M30	561	448500	476500	482200	448500	504600	504600	504600	560600	689600
M33	694	554900	589600	596500	554900	624200	624200	624200	693600	853100
M36	817	653400	694300	702400	653400	735100	735100	735100	816800	1004600
M39	976	780700	829400	839200	780700	878200	878200	878200	975800	1200200
Fp = As,nom x Sp. For the calculation of As,nom. The proof load values are calculated by using the exact data for A5, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

Proof load values for nuts at ambient temperature - Fine pitch thread

Thread DxP	As,nom mm2	Proofload, Fp N
		CH0	CH1	CH2	V	VH	VW	SD	SB	718
M8x1	39,2	31340	33300	33690	31340	35260	35260	35260	39170	48180
M10x1,25	61,2	48960	52020	52640	48960	55080	55080	55080	61200	75280
M10xl,0	64,5	51600	54820	55470	51600	58050	58050	58050	64500	79330
M12x1,5	88,1	70510	74910	75790	70510	79320	79320	79320	88130	108400
M12x1,25	92,1	73660	78270	79190	73660	82870	82870	82870	92080	113300
M14x1, 5	125	99640	105900	107200	99640	112100	112100	112100	124600	153200
M16x1,5	167	133800	142200	143900	133800	150600	150600	150600	167300	205800
M18x1,5	216	173000	183800	186000	173000	194700	194700	194700	216300	266000
M20x1,5	272	217300	230800	233500	217300	244400	244400	244400	271600	334000
M22x1,5	333	266500	283100	286500	266500	299800	299800	299800	333100	409700
M24x2	384	307600	326800	330600	307600	346000	346000	346000	384500	472900
M27x2	496	396600	421400	426400	396600	446200	446200	446200	495800	609800
M30x2	621	497000	528100	534300	497000	559100	559100	559100	621300	764100
M33x2	761	608700	646700	654300	608700	684800	684800	684800	760800	935800
M36x3	865	692000	735200	743900	692000	778500	778500	778500	865000	1063900
M39x3	1030	822800	874200	884500	822800	925600	925600	925600	1028400	1265000
Fp = As,nom x Sp. For the calculation of As,nom. The proof load values are calculated by using the exact data for A5, and only at the end the values are rounded to the next upper 10 N up to 100 000 N, and to the next upper 100 N above.

ISO 3506-5 Heat Treatment

Fastener symbol	Heat treatment condition	Temperature range for quenching/solution annealing °C (and soaking time)	Temperature for tempering/ precipitation hardening °C (and soaking time)
CH0	+ QT	950 to 1050	≥ 450 a
CH1	+ QT	950 to 1050	≥ 450 a
CH2	+ QT	950 to 1050	≥ 450 a
V	+ QT	1020 to 1070	≥ 550 a
VH	+ QT	1020 to 1070	≥ 550 a
VW	+ QT	1100 to 1130	≥ 550 a
SD	+ AT + P	970 to 990 (≥ 1h)	710 to 730 (≥ 16h)
		890 to 910 (≥ 1h)
SB	+ AT + P	1050 to 1080	1st step: 840 to 860 [≥ 24h] 2nd step: 690 to 710 [≥ 16h]
718	+ AT + P	940 to 1010	1st step: 710 to 730 [≥ 8 h] 2nd step: 610 to 630 Total treatment time: 18 h minimum
QT Quenched and Iempered. AT Solution annealed (Annealing Treatment). p Precipitation hardened. a When the intended service temperature is specified by the customer, the manufacturer shall choose a tempering temperature above this service temperature and in accordance. Otherwise, the tempering temperature is left to the choice of the manufacturer providing that the required mechanical and physical properties of the fasteners are met. b Tempering temperature between 500 oc and 600 oc should be avoided (loss of toughness and increased risk of intergranular corrosion).

Service Temperature

Fastener symbol	Maximum service temperature
CH0	400 °C
CH1	400 °C
CH2	450 °C
V	600 °C
VH	600 °C
VW	600 °C
SD	700 °C
SB	800 °C
718	700 °C

ISO 3506-5 Bolting Surface Treatment Specifications

ISO 3506-5 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.