ASTM A193/A193M

ASTM A193/A193M Bolting Specification

Alloy Steel & Stainless Steel Bolting for High Temperature or High Pressure Service

Overview

High-Quality ASTM A193/A193M Bolting Materials by Adfast Component LTD

Adfast Component LTD offers premium-quality ASTM A193/A193M bolting materials, designed for high-temperature and high-pressure applications. These alloy and stainless steel bolting components are ideal for pressure vessels, valves, flanges, and fittings. Manufactured with precision, our bolting materials, such as bars and wire rods, are hot-wrought and can undergo centerless grinding or cold drawing for enhanced performance. Austenitic stainless steel variants are available in carbide solution-treated or strain-hardened options to meet stringent industry requirements.

Our product range includes Hex Bolts, Heavy Hex Bolts, Studs, Socket Head Cap Screws, Hex Cap Screws, Threaded Rods, and Threaded Bars, available in imperial sizes from ¼” to 4” and metric sizes from M6 to M100, with fine or coarse threads. Bolting components up to 6” are PED 2014/68/EC Certified and available ex-stock. Trust Adfast Component LTD for certified, durable, and high-performance bolting solutions

Related Specifications

Chemical Composition

Ferritic Steels
Austenitic Steels

Grade	Description and UNS Designation	C	Mn	P	S	Si	Cr	Mo	V	AI
ASTM A193 Grade B5	5 % Cr	0.10 min	1.00	0.040	0.030	1.00	4.0-6.0	0.40-0.65	. . .	. . .
ASTM A193 Grade B5	Product Analysis Variation^B	0.01	0.03	0.005	0.005	0.05	0.10	0.05	. . .	. . .
ASTM A193 Grade B6, B6X	12 % Cr (410), S41000	0.08-0.15	1.00	0.040	0.030	1.00	11.5-13.5	. . .	. . .	. . .
ASTM A193 Grade B6, B6X	Product Analysis Variation^B	0.01 over	0.03	0.005	0.005	0.05	0.15	. . .	. . .	. . .
ASTM A193 Grade B7, B7M	Cr-Mo^C	0.38-0.48^D	0.75-1.00	0.035	0.040	0.15-0.35	0.80-1.10	0.15-0.25	. . .	. . .
ASTM A193 Grade B7, B7M	Product Analysis Variation^B	0.02	0.04	0.005	0.005	0.02	0.05	0.02	. . .	. . .
ASTM A193 Grade B16	Cr-Mo-V	0.36-0.47	0.45-0.70	0.035	0.040	0.15-0.35	0.80-1.15	0.50-0.65	0.25-0.35	0.015^E
ASTM A193 Grade B16	Product Analysis Variation^B	0.02	0.03	0.005	0.005	0.02	0.05	0.03	0.03	. . .

Grade	Description and UNS Designatio	Classes	C	Mn	P	S	Si	Cr	Ni	Mo	Cu	Cb^F	Ti	V	N
ASTM A193 Grade B8, B8A	304, S30400	1, 1A, 1D, 2	0.08	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0	. . .	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8, B8A	Product Analysis Variation^B	1, 1A, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8C, B8CA	347, S34700	1, 1A, 1D, 2	0.08	2.00	0.045	0.030	1.00	17.0-19.0	9.0-12.0	. . .	. . .	10 × C to 1.10	. . .	. . .	. . .
ASTM A193 Grade B8C, B8CA	Product Analysis Variation^B	1, 1A, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	0.05 under	. . .	. . .	. . .
ASTM A193 Grade B8M, B8MA, B8M2, B8M3	316, S31600	1, 1A, 1D, 2	0.08	2.00	0.045	0.030	1.00	16.0-18.0	10.0-14.0	2.00-3.00	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8M, B8MA, B8M2, B8M3	Product Analysis Variation^B	1, 1A, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	0.10	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8P, B8PA	S30500	1, 1A, 1D, 2	0.12	2.00	0.045	0.030	1.00	17.0-19.0	11.0-13.0	. . .	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8P, B8PA	Product Analysis Variation^B	1, 1A, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	. . .	. . .	. . .	. . .
ASTM A193 Grade B8N, B8NA	304N, S30451	1A, 1B, 1D, 2	0.08	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0	. . .	. . .	. . .	. . .	. . .	0.10-0.16
ASTM A193 Grade B8N, B8NA	Product Analysis Variation^B	1A, 1B, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	. . .	. . .	. . .	0.01
ASTM A193 Grade B8MN, B8MNA	316N, S31651	1A, 1B, 1D, 2	0.08	2.00	0.045	0.030	1.00	16.0-18.0	10.0-13.0	2.00-3.00	. . .	. . .	. . .	. . .	0.10-0.16
ASTM A193 Grade B8MN, B8MNA	Product Analysis Variation^B	1A, 1B, 1D, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	0.10	. . .	. . .	. . .	. . .	0.01
ASTM A193 Grade B8MLCuN, B8MLCuNA	S31254	1A, 1B, 1D, 2	0.020	1.00	0.030	0.010	0.80	19.5-20.5	17.5-18.5	6.0-6.5	0.50-1.00	. . .	. . .	. . .	0.18-0.25
ASTM A193 Grade B8MLCuN, B8MLCuNA	Product Analysis Variation^B	1A, 1B, 1D, 2	0.005	0.03	0.005	0.002	0.05	0.20	0.15	0.10	. . .	. . .	. . .	. . .	0.02
ASTM A193 Grade B8T, B8TA	321, S32100	1, 1A, 2	0.08	2.00	0.045	0.030	1.00	17.0-19.0	9.0-12.0	. . .	. . .	. . .	5 × (C + N) to 0.70	. . .	0.10
ASTM A193 Grade B8T, B8TA	Product Analysis Variation^B	1, 1A, 2	0.01	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	. . .	0.05 under	. . .	. . .
ASTM A193 Grade B8R, B8RA	S20910	1C, 1D	0.06	4.0-6.0	0.045	0.030	1.00	20.5-23.5	11.5-13.5	1.50-3.00	. . .	0.10-0.30	. . .	0.10-0.30	0.20-0.40
ASTM A193 Grade B8R, B8RA	Product Analysis Variation^B	1C, 1D	0.01	0.05	0.005	0.005	0.05	0.25	0.15	0.10	. . .	0.05	. . .	0.02	0.02
ASTM A193 Grade B8S, B8SA	S21800	1C, 1D	0.10	7.0-9.0	0.060	0.030	3.5-4.5	16.0-18.0	8.0-9.0	. . .	. . .	. . .	. . .	. . .	0.08-0.18
ASTM A193 Grade B8S, B8SA	Product Analysis Variation^B	1C, 1D	0.01	0.06	0.005	0.005	0.15	0.20	0.10	. . .	. . .	. . .	. . .	. . .	0.01
ASTM A193 Grade B8LN, B8LNA	S30453	1, 1A, 1D	0.030	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0	. . .	. . .	. . .	. . .	. . .	0.10-0.16
ASTM A193 Grade B8LN, B8LNA	Product Analysis Variation^B	1, 1A, 1D	0.005	0.04	0.010	0.005	0.05	0.20	0.15	. . .	. . .	. . .	. . .	. . .	0.01
ASTM A193 Grade B8MLN, B8MLNA	S31653	1, 1A, 1D	0.030	2.00	0.045	0.030	1.00	16.0-18.0	10.0-13.0	2.00-3.00	. . .	. . .	. . .	. . .	0.10-0.16
ASTM A193 Grade B8MLN, B8MLNA	Product Analysis Variation^B	1, 1A, 1D	0.005	0.04	0.010	0.005	0.05	0.20	0.15	0.10	. . .	. . .	. . .	. . .	0.01
ASTM A193 Grade B8CLN, B8CLNA	347LN, S34751	1, 1A, 1D	0.005-0.020	2.00	0.045	0.030	1.00	17.0-19.0	9.0-13.0	. . .	. . .	0.20-0.50; 15 × carboncontent, min	. . .	. . .	0.06-0.10
ASTM A193 Grade B8CLN, B8CLNA	Product Analysis Variation^B	1, 1A, 1D	0.002 under, 0.005 over	0.04	0.01	0.005	0.05	0.20	0.15	. . .	. . .	0.05	. . .	. . .	0.01
ASTM A193 Grade B8CLNCuB, B8CLNCuBA	S34752^G	1, 1A, 1D	0.005-0.02	2.00	0.035	0.010	0.60	17.0-19.0	10.0-13.0	0.20-1.20	2.50-3.50	0.20-0.50; 15 × carboncontent, min	. . .	. . .	0.06-0.12
ASTM A193 Grade B8CLNCuB, B8CLNCuBA	Product Analysis Variation^B	1, 1A, 1D	0.002 under, 0.005 over	0.04	0.01	0.005	0.05	0.20	0.15	. . .	0.15	0.05	. . .	. . .	0.01
ASTM A193 Grade B8ML4CuN, B8ML4CuNA	S31730	1, 1A, 1D	0.030	2.00	0.040	0.010	1.00	17.0-19.0	15.0-16.5	3.0-4.0	4.0-5.0	. . .	. . .	. . .	0.045
ASTM A193 Grade B8ML4CuN, B8ML4CuNA	Product Analysis Variation^B	1, 1A, 1D	0.005	0.04	0.005	0.002	0.05	0.20	0.15	0.10	0.15	. . .	. . .	. . .	0.01
(A) Values are maximums unless a range or a minimum is indicated. Where ellipses appear in this table, there is no requirement and the element need not be determined or reported. The intentional addition of Bi, Se, Te, and Pb is not permitted. (B) Product Analysis-Individual determinations sometimes vary from the specified limits as shown in the tables. The several determinations of any individual element in a heat may not vary both above and below the specified range. Product variation limits are over for maximums, over or under for ranges, and under for minimums, unless otherwise indicated. (C) Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H. (D) For bar sizes over 31/2 in. [90 mm], inclusive, the carbon content may be 0.50 % max. For the B7M grade, a minimum carbon of 0.28 % is permitted, provided that the required tensile properties are met in the section sizes involved, the use of AISI 4130 or 4130H is allowed. (E) Total of soluble and insoluble. (F) Columbium and Niobium are alternate names for element 41 in the Periodic Table of the Elements.

Mechanical Requirements

Ferritic Steels (Inch)
Austenitic Steels (Inch)
Ferritic Steels (Metric)
Austenitic Steels (Metric)

Grade	Diameter, in.	Minimum Tempering Temperature, °F	Tensile Strength, min, ksi	Yield Strength, min, 0.2 % offset, ksi	Elongation in 4D, min, %	Reduction of Area, min, %Reduction of Area, min, %	Hardness, max
ASTM A193 Grade B5 4 to 6 % Cr	up to 4, incl	1100	100	80	16	50	. . .
ASTM A193 Grade B6 13 % Cr	up to 4, incl	1100	110	85	15	50	. . .
ASTM A193 Grade B6X 13 % Cr	up to 4, incl	1100	90	70	16	50	26 HRC
ASTM A193 Grade B7 Cr-Mo	2 1⁄2 and under	1100	125	105	16	50	321 HBW or 35 HRC
	over 2 1⁄2 to 4	1100	115	95	16	50	321 HBW or 35 HRC
	over 4 to 7	1100	100	75	18	50	321 HBW or 35 HRC
ASTM A193 Grade B7MA Cr-Mo	4 and under	1150	100	80	18	50	235 HBW or 99 HRB
ASTM A193 Grade B7MA Cr-Mo	over 4 to 7	1150	100	75	18	50	235 HBW or 99 HRB
ASTM A193 Grade B16 Cr-Mo-V	2 1⁄2 and under	1200	125	105	18	50	321 HBW or 35 HRC
	over 21⁄2 to 4	1200	110	95	17	45	321 HBW or 35 HRC
	over 4 to 8	1200	100	85	16	45	321 HBW or 35 HRC

Grade Class , mm	Diameter	Heat Treatment^B	Tensile Strength, min,MPa	Yield Strength, min, 0.2 % offset, MPa	Elongation in 4 D,min %	Reduction of Area, min %	Hardness, max
ASTM A193 Grade B8, B8M, B8P, B8LN, B8MLN, B8CLN Classes 1 and 1D	All diameters	carbide solution treated	75	30	30	50	223 HBW or 96 HRB^C
ASTM A193 Grade B8, B8CLNCuB Classes 1 and 1D;	All diameters	carbide solution treated	75	30	35	50	223 HBW or 96 HRB^C
ASTM A193 Grade B8ML4CuN Classes 1 and 1D	All diameters	carbide solution treated	70	25	35	50	90 HRB
ASTM A193 Grade B8C, B8T Class 1	All diameters	carbide solution treated	75	30	30	50	223 HBW or 96HRB^C
ASTM A193 Grade B8A, B8CA, B8CLNA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA Class 1A	All diameters	carbide solution treated in the finished condition	75	30	30	50	192 HBW or 90 HRB
ASTM A193 Grade B8ML4CuNA Class 1A	All diameters	carbide solution treated	70	25	35	50	90 HRB
ASTM A193 Grade B8N, B8MN, B8MLCuN Classes 1B and 1D	All diameters	carbide solution treated	80	35	30	40	223 HBW or 96 HRB^C
ASTM A193 Grade B8R Classes 1C and 1D	All diameters	carbide solution treated	100	55	35	55	271 HBW or 28 HRC
ASTM A193 Grade B8RA Class 1C	All diameters	carbide solution treated in the finished condition	100	55	35	55	271 HBW or 28 HRC
ASTM A193 Grade B8S Classes 1C and 1D	All diameters	carbide solution treated	95	50	35	55	271 HBW or 28 HRC
ASTM A193 Grade B8SA Classes 1C	All diameters	carbide solution treated in the finished condition	95	50	35	55	271 HBW or 28 HRC
ASTM A193 Grade B8, B8C, B8P, B8T, B8N^DClass 2	³/₄ and under	carbide solution treated and strain hardened	125	100	12	35	321 HBW or 35 HRC
	over ³/₄ to 1, incl		115	80	15	35	321 HBW or 35 HRC
	over 1 to 1¹/₄ , incl		105	65	20	35	321 HBW or 35 HRC
	over 1¹/₄ to 1¹/₂ , incl		100	50	28	45	321 HBW or 35 HRC
ASTM A193 Grade B8M, B8MN, B8MLCuN^DClass 2	³/₄ and under	carbide solution treated and strain hardened	110	95	15	45	321 HBW or 35 HRC
	over ³/₄ to 1 incl		100	80	20	45	321 HBW or 35 HRC
	Over 1 to 1¹/₄ , incl		95	65	25	45	321 HBW or 35 HRC
	over 1¹/₄ to 1¹/₂ , incl		90	50	30	45	321 HBW or 35 HRC
ASTM A193 Grade B8, B8M2^DClass 2B	2 and under	carbide solution treated and strain hardened	95	75	25	40	321 HBW or 35 HRC
	over 2 to 2¹/₂ incl		90	65	30	40	321 HBW or 35 HRC
	over 2¹/₂ to 3 incl		80	55	30	40	321 HBW or 35 HRC
ASTM A193 Grade B8M3^DClass 2C	2 and under	carbide solution treated and strain hardened	85	65	30	60	321 HBW or 35 HRC
ASTM A193 Grade B8M3^DClass 2C	over 2	carbide solution treated and strain hardened	85	60	30	60	321 HBW or 35 HRC
(A) To meet the tensile requirements, the Brinell hardness shall be over 200 HBW (93 HRB). (B) Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement. Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over 3/4 in. in diameter. (C) For sizes 3/4 in. in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted. (D) For diameters 11/2 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at 1/2 radius.

Class	Diameter, [mm]	Min.Tempering Temp. °C	Tensile Strength, min, MPa	Yield Strength,min, .2% offset, MPa	Elongation in 4D, min, %	Reduction of Area, min, %	Hardness, max
ASTM A193M Grade B5 4 to 6 % Cr	up to M100, incl	593	690	550	16	50	. . .
ASTM A193M Grade B6 13 % Cr	up to M100, incl	593	760	585	15	50	. . .
ASTM A193M Grade B6X 13 % Cr	up to M100, incl	593	620	485	16	50	26 HRC
ASTM A193M Grade B7 Cr-Mo	M64 and under	593	860	720	16	50	321 HBW or 35 HRC
	over M64 to M100	593	795	655	16	50	321 HBW or 35 HRC
	over M100 to M180	593	690	515	18	50	321 HBW or 35 HRC
ASTM A193M Grade B7M^A Cr-Mo	M100 and under	620	690	550	18	50	235 HBW or 99 HRB
ASTM A193M Grade B7M^A Cr-Mo	over M100 to M180	620	690	515	18	50	235 HBW or 99 HRB
ASTM A193M Grade B16 Cr-Mo-V	M64 and under	650	860	725	18	50	321 HBW or 35 HRC
	over M64 to M100	650	760	655	17	45	321 HBW or 35 HRC
	over M100 to M200	650	690	585	16	45	321 HBW or 35 HRC

Grade Class , mm	Diameter	Heat Treatment^B	Tensile Strength, min,MPa	Yield Strength, min, 0.2 % offset, MPa	Elongation in 4 D,min %	Reduction of Area, min %	Hardness, max
ASTM A193M Grade B8, B8M, B8P, B8LN, B8MLN, B8CLN All diameters Classes 1 and 1D	All diameters	carbide solution treated	515	205	30	50	223 HBW or 96 HRB^C
ASTM A193M Grade B8CLNCuB All diameters Classes 1,1A,1D	All diameters	carbide solution treated	515	205	30	50	223 HBW or 96 HRB^C
ASTM A193M Grade B8ML4CuN All diameters Classes 1 and 1D	All diameters	carbide solution treated	480	175	35	50	90 HRB
ASTM A193M Grade B8C, B8T All diameters Class 1	All diameters	carbide solution treated	515	205	30	50	223 HBW or 96HRB^C
ASTM A193M Grade B8A, B8CA, B8CLNA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA All diameters Class 1A	All diameters	carbide solution treated in the finished condition	515	205	30	50	192 HBW or 90 HRB
ASTM A193M Grade B8ML4CuNA All diameters Class 1A	All diameters	carbide solution treated	480	175	35	50	90 HRB
ASTM A193M Grade B8N, B8MN, B8MLCuN All diameters Classes 1B and 1D	All diameters	carbide solution treated	550	240	30	40	223 HBW or 96 HRB^C
ASTM A193M Grade B8R All diameters Classes 1C and 1D	All diameters	carbide solution treated	690	380	35	55	271 HBW or 28 HRC
ASTM A193M Grade B8RA All diameters Class 1C	All diameters	carbide solution treated in the finished condition	690	380	35	55	271 HBW or 28 HRC
ASTM A193M Grade B8S All diameters Classes 1C and 1D	All diameters	carbide solution treated	655	345	35	55	271 HBW or 28 HRC
ASTM A193M Grade B8SA All diameters Classes 1C	All diameters	carbide solution treated in the finished condition	655	345	35	55	271 HBW or 28 HRC
ASTM A193M Grade B8, B8C, B8P, B8T, B8N^D, Class 2	M20 and under	carbide solution treated and strain hardened	860	690	12	35	321 HBW or 35 HRC
	over M20 to M24, incl		795	550	15	35	321 HBW or 35 HRC
	over M24 to M30, incl		725	450	20	35	321 HBW or 35 HRC
	over M30 to M36, incl		690	345	28	45	321 HBW or 35 HRC
ASTM A193M Grade B8M, B8MN, B8MLCuN^D, Class 2	M20 and under	carbide solution treated and strain hardened	760	655	15	45	321 HBW or 35 HRC
	over M20 to M24, incl		690	550	20	45	321 HBW or 35 HRC
	over M24 to M30, incl		655	450	25	45	321 HBW or 35 HRC
	over M30 to M36, incl		620	345	30	45	321 HBW or 35 HRC
ASTM A193M Grade B8, B8M2^D, Class 2B	M48 and under	carbide solution treated and strain hardened	655	515	25	40	321 HBW or 35 HRC
	over M48 to M64, incl		620	450	30	40	321 HBW or 35 HRC
	over M64 to M72, incl		550	380	30	40	321 HBW or 35 HRC
ASTM A193M Grade B8M3^D, Class 2C	M48 and under	carbide solution treated and strain hardened	585	450	30	60	321 HBW or 35 HRC
ASTM A193M Grade B8M3^D, Class 2C	over M48	carbide solution treated and strain hardened	585	415	30	60	321 HBW or 35 HRC
(A) To meet the tensile requirements, the Brinell hardness shall be over 200 HBW (93 HRB). (B) Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement. Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over M20 mm in diameter. (C) For sizes M20 mm in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted. (D) For diameters M38 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at 1/2 radius.

Coating Specifications

A153/A153M Specification for Hot Dip Galvanising (Zinc Coating) on Iron and Steel Hardware
B633 Specification for Electrodeposited Coatings of Zinc on Iron and Steel
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
B696 Specification for Coatings of Cadmium Mechanically Deposited
B766 Specification for Electrodeposited Coatings of Cadmium
F1941/F1941M Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
F2329/F2329M Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners

Renowned Brands

Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark Adfast Component LTD 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.

Austenitic Steels
Ferritic Steels

Grade	Class	Grade Symbol
ASTM A193 Grade B8	Class 1	B8
ASTM A193 Grade B8C		B8C
ASTM A193 Grade B8M		B8M
ASTM A193 Grade B8P		B8P
ASTM A193 Grade B8T		B8T
ASTM A193 Grade B8LN		B8F or B8LN
ASTM A193 Grade B8MLN		B8G or B8MLN
ASTM A193 Grade B8CLN		B8Y or B8CLN
ASTM A193 Grade B8CLNCuB		B8CLNCuB
ASTM A193 Grade B8ML4CuN		B8YY or B8ML4CuN
ASTM A193 Grade B8A	Class 1A	B8A
ASTM A193 Grade B8CA		B8TB B or B8CA
ASTM A193 Grade B8MA		B8D or B8MA
ASTM A193 Grade B8PA		B8H or B8PA
ASTM A193 Grade B8TA		B8J or B8TA
ASTM A193 Grade B8LNA		B8L or B8LNA
ASTM A193 Grade B8MLNA		B8K or B8MLNA
ASTM A193 Grade B8NA		B8V or B8MA
ASTM A193 Grade B8MNA		B8W or B8MNA
ASTM A193 Grade B8MLCuNA		B9K or B8MLCuNA
ASTM A193 Grade B8CLNA		B8Z or B8CLNA
ASTM A193 Grade B8CLNCuBA		B8ZA or B8CLNCuBA
ASTM A193 Grade B8ML4CuNA		B8ZZ or B8MLCuNA
ASTM A193 Grade B8N	Class 1B	B8N or B8Y
ASTM A193 Grade B8MN		B8MN or B9J
ASTM A193 Grade B8MLCuN		B8MLCuN
ASTM A193 Grade B8R	Class 1C	B9A or B8R
ASTM A193 Grade B8RA		B9TB B or B8RA
ASTM A193 Grade B8S		B9D or B8S
ASTM A193 Grade B8SA		B9F or B8SA
ASTM A193 Grade B8	Class 1D	B94
ASTM A193 Grade B8M		B95
ASTM A193 Grade B8P		B96
ASTM A193 Grade B8LN		B97
ASTM A193 Grade B8MLN		B98
ASTM A193 Grade B8N		B99
ASTM A193 Grade B8MN		B100
ASTM A193 Grade B8R		B101
ASTM A193 Grade B8S		B102
ASTM A193 Grade B8CLN		B103
ASTM A193 Grade B8ML4CuN		B104
ASTM A193 Grade B8	Class 2	B8SH
ASTM A193 Grade B8C		B8CSH
ASTM A193 Grade B8P		B8PSH
ASTM A193 Grade B8T		B8TSH
ASTM A193 Grade B8N		B8NSH
ASTM A193 Grade B8M		B8MSH
ASTM A193 Grade B8MN		B8YSH
ASTM A193 Grade B8MLCuN		B8JSH
ASTM A193 Grade B8M2 B8	Class 2B	B9G or B8M2 B9
ASTM A193 Grade B8M3	Class 2C	B9H or B8M3

Grade	Grade Symbol
ASTM A193 Grade B5	B5
ASTM A193 Grade B6	B6
ASTM A193 Grade B6X	B6X
ASTM A193 Grade B7	B7
ASTM A193 Grade B7M	B7M or B7M
ASTM A193 Grade B16	B16
ASTM A193 Grade B16 + Supplement S12	B16R

Dimensional Standards

ASME Bolt Dimensional Standards

B18.31.2 Imperial Continious Thread, Double End Reduced & Full Body Studs
B18.31.1M Metric Continious Thread, Double End Reduced & Full Body Studs
B16.5 Imperial Full Thread Stud Bolts
B16.5 Metric Full Thread Stud Bolts
B18.2.1 Imperial Square and Hex Bolts and Screws
B18.2.3.1M Metric Hex Cap Screws
B18.2.3.3M Metric Heavy Hex Screws
B18.2.3.5M Metric Hex Bolts
B18.3 Imperial Hexagon Socket and Spline Socket Screws
B18.3.1M Metric Socket Head Cap Screws
B18.6.7M Metric Machine Screws
B18.31.3 Threaded Rods (Inch Series)

Certification

Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic Materials
E150 Recommended Practice for Conducting Creep and Creep-Rupture Tension Tests of Metallic Materials Under Conditions of Rapid Heating and Short Times
E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and Structures
E566 Practice for Electromagnetic (Eddy Current) Sorting of Ferrous Metals
E709 Guide for Magnetic Particle Testing
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M for Steel Forgings, General Requirements

Threading Specs

Supplementary Requirements

S1	High Temperature Tests
S2	Charpy impact tests based on the requirements of Specification A320/A320M
S3	100 % Hardness Testing of Grade B7M
S4	Hardness of Grade B16 for bolts or studs 21⁄2 in. [65 mm] or smaller shall be between 253-319 HBW or 25-34 HRC
S5	Product Marking 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]
S6	Stress Relieving temperature shall be 100 °F [55 °C] below the tempering temperature.
S7	Magnetic Particle Inspection for Bars shall be in accordance with Guide E709.
S8	Stress Relaxation Testing, when required, shall be done in accordance with Test Methods E328
S9	Grain Size Requirements for Non H Grade Austenitic Steels Used Above 1000 °F
S10	Hardness Testing of Class 2 Bolting for ASME Applications ( Max 35HRC)
S11	Threads shall be formed after heat treatment except for Grades B8RA and B8SA Class 1A and Class 1C & Grade B7M
S12	Stress Rupture Testing of Grade B16 shall be conducted at 1100 °F [595 °C] and 20 ksi [140 MPa] 25h minimum except for 1⁄2 in. [12 mm] thick
S13	Coated Bolting Components to be marked after grade symbol, ZN For Zinc Coating & CD for Cadmium Coating
S14	Marking Coated Bolting Components
S15	Requirements for Service Temperature Exceeding 1000°F for bolting of Class 1 Grades B8, B8C, B8M, and B8T
(A) Values are maximums unless a range or a minimum is indicated. Where ellipses appear in this table, there is no requirement and the element need not be determined or reported. The intentional addition of Bi, Se, Te, and Pb is not permitted. (B) Product Analysis-Individual determinations sometimes vary from the specified limits as shown in the tables. The several determinations of any individual element in a heat may not vary both above and below the specified range. Product variation limits are over for maximums, over or under for ranges, and under for minimums, unless otherwise indicated. (C) Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H. (D) For bar sizes over 31/2 in. [90 mm], inclusive, the carbon content may be 0.50 % max. For the B7M grade, a minimum carbon of 0.28 % is permitted, provided that the required tensile properties are met in the section sizes involved, the use of AISI 4130 or 4130H is allowed. (E) Total of soluble and insoluble. (F) Columbium and Niobium are alternate names for element 41 in the Periodic Table of the Elements.

Product

Precision Components

Contract Manufacturing

Fastener

Resources

materials

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