ASTM A453/A453M

Adfast Component LTD offers premium-quality ASTM/ASME A453/A453M bolting materials, designed for high-temperature applications in pressure vessels and valve flanges. Our product range includes bolts, screws, nuts, and studs made from Grade 660 stainless steel, known for its exceptional strength and oxidation resistance up to 1300ºF. These fasteners feature a coefficient of expansion similar to austenitic stainless steel and are available in solution-treated and precipitation-hardened conditions.

All ASTM A453 Grade 660 fasteners are manufactured using advanced processes like Argon Oxygen Decarburization (AOD), Vacuum Induction Melting (VIM), and further refined by Vacuum Arc Refining (VAR) or Electro Slag Refining (ESR). With options for oil or liquid quenching, these fasteners undergo mandatory 100-hour Stress Rupture Testing, ensuring unmatched performance. Available in sizes ranging from ¼” to 6” imperial and M6 to M100 metric, Adfast’s bolting components are PED 2014/68/EC certified and ready for immediate shipment.

Specification	Grade	UNS No.	CLASS	Type
ASTM A453/A453M	Grade 660	S66286	Class A	Class B	Class C	Class D	M1	M2	R1	R2
ASTM A453/A453M	Grade 651	S63198	Class A	Class B			M1	M2	R1	R2
ASTM A453/A453M	Grade 662	S66220	Class A	Class B			M1	M2	R1	R2
ASTM A453/A453M	Grade 665	S66545	Class A	Class B			M1	M2	R1	R2
ASTM A453/A453M	Grade 668	S66285	Class A	Class B			M1	M2	R1	R2

Grade	UNS Number	Elements	C	Mn	P	S	Si	Ni	Cr	Mo	W	Ti	Nb A	Al	V	B	Cu
ASTM A453 Grade 660	S66286	Content, %	0.08 max	2.00 max	0.040 max	0.030 max	1.00 max	24.0-27.0	13.5-16.0	1.00-1.50	…	1.90-2.35	…	0.35 max	0.10-0.50	0.001-0.010	…
ASTM A453 Grade 660	S66286	Product Analysis Variation, Over or Under, %	0.01 over	0.04	0.005 over	0.005 over	0.05	0.2	0.2	0.05	…	0.05	…	0.05 over	0.03	0.0004 under to 0.001 over	…
ASTM A453 Grade 651	S63198	Content, %	0.28-0.35	0.75-1.50	0.040 max	0.030 max	0.30-0.80	8.0-11.0	18.0-21.0	1.00-1.75	1.00-1.75	0.10-0.35	0.25-0.60	…	…	…	0.50 max
ASTM A453 Grade 651	S63198	Product Analysis Variation, Over or Under, %	0.02	0.04	0.005 over	0.005 over	0.05	0.15	0.25	0.05	0.05	0.05 over	0.05	…	…	…	0.03 over
ASTM A453 Grade 662	S66220	Content, %	0.08 max	0.40-1.00	0.040 max	0.030 max	0.40-1.00	24.0-28.0	12.0-15.0	2.0-3.5	…	1.80-2.10	…	0.35 max	…	0.001-0.010	0.50 max
ASTM A453 Grade 662	S66220	Product Analysis, Variation Over or Under, %	0.01 over	0.03	0.005 over	0.005 over	0.05	0.2	0.15	0.1	…	0.05	…	0.05 over	…	0.0004 under to 0.001 over	0.03 over
ASTM A453 Grade 665	S66545	Content, %	0.08 max	1.25-2.00	0.040 max	0.030 max	0.10-0.80	24.0-28.0	12.0-15.0	1.25-2.25	…	2.70-3.3	…	0.25 max	…	0.01-0.07	0.25 max
ASTM A453 Grade 665	S66545	Product Analysis Variation, Over or Under, %	0.01 over	0.04	0.005 over	0.005 over	0.05	0.2	0.15	0.1	…	0.05	…	0.05 over	…	0.01	0.03 over
ASTM A453 Grade 668	S66285	Content, %	0.08 max	2.00 max	0.040 max	0.030 max	1.00 max	17.5-21.5	13.5-16.0	1.50 max	…	2.2-2.8	…	0.50 max	0.50 max	0.001-0.010	…
ASTM A453 Grade 668	S66285	Product Analysis, Variation Over or Under, %	0.01 over	0.04	0.005 over	0.005 over	0.05	0.2	0.2	0.05	…	0.05	…	0.05 over	0.03	0.0004 under to 0.001 over	…
(A) Or columbium plus tantalum.

Grade	Class	Tensile Strength, min	Yield Strength (0.2 % Offset), min	Elongation in 4× Diam, min, %	Reduction of Area, min, %	Brinell Hardness Number	Approximate Rockwell Hardness, B and C
ASTM A453/A453M Grade 660	A, B, and C	130	895	85	585	15	18	248-341	24 HRC	37 HRC
D (≤2¹/₂in. [63.5 mm])	130	895	105	725	15	18	248-321	24 HRC	35 HRC
D (>2¹/₂in. [63.5 mm])	120	825	95	655	15	18	248-321	24 HRC	35 HRC
ASTM A453/A453M Grade 651	A	100	690	70^A	485	18	35	217-277	95 HRB	29 HRC
60^B	415
B	95	655	60^A	415	18	35	212-269	93 HRB	28 HRC^C
50^B	345
ASTM A453/A453M Grade 662	A	130	895	85	585	15	18	248-321	24 HRC	35 HRC^C
B	125	860	80	550	15	18	248-321	24 HRC	35 HRC
ASTM A453/A453M Grade 665	A	170	1170	120	830	12	15	311-388	32 HRC	41 HRC
B	155	1070	120	830	12	15	311-388	32 HRC	41 HRC
ASTM A453/A453M Grade 668	A and B	130	895	85	585	15	18	248-341	24 HRC	37 HRC
(A) Bolting material sizes 3 in. [76 mm] and under in diameter. (B) Bolting material sizes over 3 in. [76 mm] in diameter. (C) Conversion numbers taken from Specification A193/A193M, Table number 2 (austenitic steels); others by interpolation.

Grade

Class

Tensile Strength, min

Yield Strength (0.2 % Offset), min

Elongation in 4× Diam, min, %

Reduction of Area, min, %

Brinell Hardness Number

Approximate Rockwell Hardness, B and C

ksi

MPa

ksi

MPa

min

max

ASTM A453/A453M Grade 660

A, B, and C

130

895

585

248-341

24 HRC

37 HRC

D (≤2¹/₂in. [63.5 mm])

130

895

105

725

248-321

24 HRC

35 HRC

D (>2¹/₂in. [63.5 mm])

120

825

655

248-321

24 HRC

35 HRC

ASTM A453/A453M Grade 651

100

690

70^A

485

217-277

95 HRB

29 HRC

60^B

415

655

60^A

415

212-269

93 HRB

28 HRC^C

50^B

345

ASTM A453/A453M Grade 662

130

895

585

248-321

24 HRC

35 HRC^C

125

860

550

248-321

24 HRC

35 HRC

ASTM A453/A453M Grade 665

170

1170

120

830

311-388

32 HRC

41 HRC

155

1070

120

830

311-388

32 HRC

41 HRC

ASTM A453/A453M Grade 668

A and B

130

895

585

248-341

24 HRC

37 HRC

(A) Bolting material sizes 3 in. [76 mm] and under in diameter.
(B) Bolting material sizes over 3 in. [76 mm] in diameter.
(C) Conversion numbers taken from Specification A193/A193M, Table number 2 (austenitic steels); others by interpolation.

Grade	Class	Test Temperature, °F [°C]	Stress, min	Time to Rupture, min, h^A	Elongation, min, %
ASTM A453/A453M Grade 660	A, B, and C	1200 [650]	56	385	100	5
ASTM A453/A453M Grade 651	A and B	1200 [650]	40	275	100	5
ASTM A453/A453M Grade 662	A and B	1200 [650]	55	380	100	5
ASTM A453/A453M Grade 665	A	1200 [650]	75	515	100	3
B	1200 [650]	70	485	100	5
(A) The combination bar specimen shown in Fig. 1 shall be tested continuously at the temperature and at the minimum stress specified or at a greater stress and shall rupture in a time not less than that specified. (A) When it is necessary to heat treat or heat treat and pickle after cold finishing, because of special hardness or mechanical property requirements, the permissible variations are generally double those shown in the table. (B) For size tolerances of sizes over 4 in. [100 mm], the manufacturer should be consulted.

Grade

Class

Test Temperature, °F [°C]

Stress, min

Time to Rupture, min, h^A

Elongation, min, %

ksi

MPa

ASTM A453/A453M Grade 660

A, B, and C

1200 [650]

385

100

ASTM A453/A453M Grade 651

A and B

1200 [650]

275

100

ASTM A453/A453M Grade 662

A and B

1200 [650]

380

100

ASTM A453/A453M Grade 665

1200 [650]

515

100

1200 [650]

485

100

(A) The combination bar specimen shown in Fig. 1 shall be tested continuously at the temperature and at the minimum stress specified or at a greater stress and shall rupture in a time not less than that specified.
(A) When it is necessary to heat treat or heat treat and pickle after cold finishing, because of special hardness or mechanical property requirements, the permissible variations are generally double those shown in the table.
(B) For size tolerances of sizes over 4 in. [100 mm], the manufacturer should be consulted.

Specimen Dimensions	Specimen Type	Mid-length Gage Dia D and Notch-Root Dia F	Gage Length, G	Shoulder Diameter, H	Notch-Root Radius
Inches	1	0.125	0.5	0.177	0.005
2	0.160	0.65	0.226	0.005
3	0.178	0.75	0.250	0.005
4	0.252	1.0	0.375	0.007
5	0.357	1.5	0.500	0.010
6	0.505	2.0	0.750	0.015
Tolerance	±0.001	±0.05	±0.003	±0.0005
Millimetres	7	3.17	12.0	4.5	0.13
8	4.06	17.0	5.5	0.13
9	4.52	20.0	6.5	0.13
10	6.40	25.0	9.5	0.18
11	9.07	40.0	12.0	0.25
12	12.8	50.0	19.0	0.38
Tolerance	±0.025	±1.3	±0.1	±0.01

Specimen Dimensions

Specimen Type

Mid-length Gage Dia D and Notch-Root Dia F

Gage Length, G

Shoulder Diameter, H

Notch-Root Radius

Inches

0.125

0.5

0.177

0.005

0.160

0.65

0.226

0.005

0.178

0.75

0.250

0.005

0.252

1.0

0.375

0.007

0.357

1.5

0.500

0.010

0.505

2.0

0.750

0.015

Tolerance

±0.001

±0.05

±0.003

±0.0005

Millimetres

3.17

12.0

4.5

0.13

4.06

17.0

5.5

0.13

4.52

20.0

6.5

0.13

6.40

25.0

9.5

0.18

9.07

40.0

12.0

0.25

12.8

50.0

19.0

0.38

Tolerance

±0.025

±1.3

±0.1

±0.01

Grade Symbol	Class	Solution Treatment	Hardening Treatment
ASTM A453/A453M Grade 660	A	1650 ± 25 °F [900 ± 14 °C], hold 2 h, min, and liquid quench	1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool
B	1800 ± 25 °F [980 ± 14 °C], hold 1 h, min, and liquid quench	1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool
C	1800 ± 25 °F [980 ± 14 °C], hold 1 h min, and oil quench	1425 ± 25 °F [775 ± 14 °C] hold 16 h, air cool, followed by 1200 ± 25 °F [650 ± 14 °C] hold 16 h, air cool
D	1650 ± 25 °F [900 ± 14 °C], hold 2 h min, and liquid quench or 1800 ± 25 °F [980 ± 14 °C], hold 1 h min, and liquid quench	1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool If necessary to achieve properties, second age: 1200 ± 25 °F [650 ± 14 °C] hold 16 h, air cool
ASTM A453/A453M Grade 651	A	…	hot-cold worked at 1200 °F [650 °C] min with 15 % min reduction in cross-sectional area, stress relieve at 1200 °F [650 °C] min or 4 h, min
B	…	hot-cold worked at 1200 °F [650 °C] min with 15 % min reduction of cross-sectional area, stress relieve at 1350 °F [730 °C] min for 4 h, min
ASTM A453/A453M Grade 662	A	1800 ± 25 °F [980 ± 14 °C], hold 2 h, liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool
B	1950 ± 25 °F [1065 ± 14 °C], hold 2 h, liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool
ASTM A453/A453M Grade 665	A	1800 ± 25 °F [980 ± 14 °C], hold 3 h, liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool
B	2000 ± 25 °F [1095 ± 14 °C], hold 3 h, liquid quench	1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool
ASTM A453/A453M Grade 668	A	1650 ± 25 °F [900 ± 14 °C], hold 2 h, min and liquid quench	1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool
B	1800 ± 25 °F [980 ± 14 °C], hold 1 h, min and liquid quench	1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool
(A) Times refer to the minimum time material is required to be at temperature.

Grade Symbol

Class

Solution Treatment

Hardening Treatment

ASTM A453/A453M Grade 660

1650 ± 25 °F [900 ± 14 °C], hold 2 h, min, and liquid quench

1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool

1800 ± 25 °F [980 ± 14 °C], hold 1 h, min, and liquid quench

1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool

1800 ± 25 °F [980 ± 14 °C], hold 1 h min, and oil quench

1425 ± 25 °F [775 ± 14 °C] hold 16 h, air cool, followed by 1200 ± 25 °F [650 ± 14 °C] hold 16 h, air cool

1650 ± 25 °F [900 ± 14 °C], hold 2 h min, and liquid quench or 1800 ± 25 °F [980 ± 14 °C], hold 1 h min, and liquid quench

1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool If necessary to achieve properties, second age: 1200 ± 25 °F [650 ± 14 °C] hold 16 h, air cool

ASTM A453/A453M Grade 651

…

hot-cold worked at 1200 °F [650 °C] min with 15 % min reduction in cross-sectional area, stress relieve at 1200 °F [650 °C] min or 4 h, min

…

hot-cold worked at 1200 °F [650 °C] min with 15 % min reduction of cross-sectional area, stress relieve at 1350 °F [730 °C] min for 4 h, min

ASTM A453/A453M Grade 662

1800 ± 25 °F [980 ± 14 °C], hold 2 h, liquid quench

1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool

1950 ± 25 °F [1065 ± 14 °C], hold 2 h, liquid quench

1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool

ASTM A453/A453M Grade 665

1800 ± 25 °F [980 ± 14 °C], hold 3 h, liquid quench

1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool

2000 ± 25 °F [1095 ± 14 °C], hold 3 h, liquid quench

1350 to 1400 °F [730 to 760 °C], hold 20 h, furnace cool to 1200 ± 25 °F [650 ± 14 °C], hold 20 h, air cool

ASTM A453/A453M Grade 668

1650 ± 25 °F [900 ± 14 °C], hold 2 h, min and liquid quench

1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool

1800 ± 25 °F [980 ± 14 °C], hold 1 h, min and liquid quench

1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool

(A) Times refer to the minimum time material is required to be at temperature.

Diameter, in. [mm]	Weight, lb [kg]
To 1³/₄ [44]	3000 [1400]
Over 1³/₄ [44] to 2¹/₂ [63]	6000 [2700]
Over 2¹/₂ [63]	12000 [5400]

Diameter, in. [mm]

Weight, lb [kg]

To 1³/₄ [44]

3000 [1400]

Over 1³/₄ [44] to 2¹/₂ [63]

6000 [2700]

Over 2¹/₂ [63]

12000 [5400]

Diameter, in. [mm]	Maximum Lot Size, lb [kg]
1¹/₂ [38] and under	200 [90]
Over 1¹/₂ [38] to 1³/₄ [44], incl	300 [140]
Over 1³/₄ [44] to 2¹/₂ [63], incl	600 [270]
Over 2¹/₂ [63]	20 pieces

Diameter, in. [mm]

Maximum Lot Size, lb [kg]

1¹/₂ [38] and under

200 [90]

Over 1¹/₂ [38] to 1³/₄ [44], incl

300 [140]

Over 1³/₄ [44] to 2¹/₂ [63], incl

600 [270]

Over 2¹/₂ [63]

20 pieces

Grade	Marking
ASTM A453/A453M GRADE 660 CLASS A	660A M1/M2/R1/R2
ASTM A453/A453M GRADE 660 CLASS B	660B M1/M2/R1/R2
ASTM A453/A453M GRADE 660 CLASS C	660C M1/M2/R1/R2
ASTM A453/A453M GRADE 660 CLASS D	660D M1/M2/R1/R2 NR
ASTM A453/A453M GRADE 651 CLASS A	651A M1/M2/R1/R2
ASTM A453/A453M GRADE 651 CLASS B	651B M1/M2/R1/R2
ASTM A453/A453M GRADE 662 CLASS A	662A M1/M2/R1/R2
ASTM A453/A453M GRADE 662 CLASS B	662B M1/M2/R1/R2
ASTM A453/A453M GRADE 65 CLASS A	665A M1/M2/R1/R2
ASTM A453/A453M GRADE 665 CLASS B	665B M1/M2/R1/R2
ASTM A453/A453M GRADE 668 CLASS A	668A M1/M2/R1/R2 NR
ASTM A453/A453M GRADE 668 CLASS B	668B M1/M2/R1/R2 NR

Grade

Marking

ASTM A453/A453M GRADE 660 CLASS A

660A M1/M2/R1/R2

ASTM A453/A453M GRADE 660 CLASS B

660B M1/M2/R1/R2

ASTM A453/A453M GRADE 660 CLASS C

660C M1/M2/R1/R2

ASTM A453/A453M GRADE 660 CLASS D

660D M1/M2/R1/R2 NR

ASTM A453/A453M GRADE 651 CLASS A

651A M1/M2/R1/R2

ASTM A453/A453M GRADE 651 CLASS B

651B M1/M2/R1/R2

ASTM A453/A453M GRADE 662 CLASS A

662A M1/M2/R1/R2

ASTM A453/A453M GRADE 662 CLASS B

662B M1/M2/R1/R2

ASTM A453/A453M GRADE 65 CLASS A

665A M1/M2/R1/R2

ASTM A453/A453M GRADE 665 CLASS B

665B M1/M2/R1/R2

ASTM A453/A453M GRADE 668 CLASS A

668A M1/M2/R1/R2 NR

ASTM A453/A453M GRADE 668 CLASS B

668B M1/M2/R1/R2 NR

Specified Size, in. [mm]	Permissible Variations from Specified Size, in. [mm]^A
Over ¹/₂ to 1 [13 to 25], excl	0.002 [0.05]	0.002 [0.05]
1 to 1¹/₂ [25 to 38], excl	0.0025 [0.06]	0.0025 [0.06]
1¹/₂ to 4 [38 to 100], incl^B	0.003 [0.08]	0.003 [0.08]
(A) When it is necessary to heat treat or heat treat and pickle after cold finishing, because of special hardness or mechanical property requirements, the permissible variations are generally double those shown in the table. (B) For size tolerances of sizes over 4 in. [100 mm], the manufacturer should be consulted.

Specified Size, in. [mm]

Permissible Variations from Specified Size, in. [mm]^A

Over

Under

Over ¹/₂ to 1 [13 to 25], excl

0.002 [0.05]

1 to 1¹/₂ [25 to 38], excl

0.0025 [0.06]

1¹/₂ to 4 [38 to 100], incl^B

0.003 [0.08]

(A) When it is necessary to heat treat or heat treat and pickle after cold finishing, because of special hardness or mechanical property requirements, the permissible variations are generally double those shown in the table.
(B) For size tolerances of sizes over 4 in. [100 mm], the manufacturer should be consulted.

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ASTM A453/A453M Bolting Specification

Table of Contents

Overview

High-Temperature ASTM A453/A453M Bolting Materials by Adfast Component LTD

Related Specifications

Bolting Types

Chemical Composition

Mechanical Requirements

Stress Rupture Properties

Smooth-Notch

Heat Treatment

Coating Specifications

Renowned Brands

Bolting Components Marking

Dimensional Standards

Certification

Testing Standards

Threading Specs

Supplementary Requirements

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