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Grade B8 B8M 4140 Threaded Rod End To End Class 2A Metal Stud Bar

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Stud Bar ASTM A193 Grade B8 B8M "End to End" Class 2A

Class 1A: B8A, B8CA, B8CLNA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA, all diameters Class 1A: B8ML4CuNA, all diameters

Classes 1B and 1D: B8N, B8MN, B8MLCuN, all diameters

Classes 1C and 1D: B8R, all diameters

Class 1C: B8RA, all diameters

Classes 1C and 1D: B8S, all diameters

Classes 1C: B8SA, all diameters

Class 2: B8, B8C, B8P, B8T, B8N,^D M20 and under

over M20 to M24, incl

over M24 to M30, incl

A193/A193M − 20

	TABLE 3	Continued

		Tensile	Yield
		Strength,	Strength,	Elongation	Reduction	Hardness,
Class Diameter, mm	Heat Treatment^B	min,	min, 0.2	in 4 D,	of Area,	Hardness,
		MPa	% offset,	min %	min %	max
		MPa	% offset,	min %	min %
			MPa

	Austenitic Steels

Classes 1 and 1D; B8, B8M, B8P, B8LN, carbide solution treated		515	205	30	50	223 HBW or 96
B8MLN, B8CLN, all diameters						HRB^C
Classes 1,1A,1D, B8CLNCuB, all	carbide solution treated	515	205	30	50	223 HBW or 96
diameters 1						HRB^C
Classes 1 and 1D: B8ML4CuN, all	carbide solution treated	480	175	35	50	90 HRB
diameters
Class 1: B8C, B8T, all diameters	carbide solution treated	515	205	30	50	223 HBW or
						96HRB^C

carbide solution treated in the finished	515	205	30	50	192 HBW or 90
condition					HRB
carbide solution treated	480	175	35	50	90 HRB
carbide solution treated	550	240	30	40	223 HBW or 96
					HRB^C
carbide solution treated	690	380	35	55	271 HBW or 28
					HRC
carbide solution treated in the finished	690	380	35	55	271 HBW or 28
condition					HRC
carbide solution treated	655	345	35	55	271 HBW or 28
					HRC
carbide solution treated in the finished	655	345	35	55	271 HBW or 28
condition					HRC
carbide solution treated and strain	860	690	12	35	321 HBW or 35
hardened					HRC
	795	550	15	35	321 HBW or 35
					HRC
	725	450	20	35	321 HBW or 35
					HRC

over M30 to M36, incl		690	345	28	45	321 HBW or 35
						HRC
Class 2: B8M, B8MN, B8MLCuN,^D	carbide solution treated and strain	760	655	15	45	321 HBW or 35
M20 and under	hardened					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
Class 2B: B8, B8M2,^D	carbide solution treated and strain	655	515	25	40	321 HBW or 35
M48 and under	hardened					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
Class 2C: B8M3,^D	carbide solution treated and strain	585	450	30	60	321 HBW or 35
M48 and under	hardened					HRC
over M48		585	415	30	60	321 HBW or 35
						HRC

To meet the tensile requirements, the Brinell hardness shall be over 200 HBW (93 HRB).

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.
For sizes M20 mm in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.

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.

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