ASTM A193 Grade B8LNA Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 304LN stainless steel.

ASTM A193 Grade B8LNA is a standard material specification for nitrogen enhanced corrosion resistant 304LN stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8LNA is a carbide solution treated 304LN stainless steel classified under class 1A having a minimum tensile requirement of 75 ksi, yield 30 ksi and maximum hardness limit of 223 HBW or 96 HRB. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8LNA Fasteners.

Chemical Composition

Element	Austenitic Stainless Steel
	AISI 304LN / UNS S30453
	CompositionA, %
Carbon	0.03 max
Manganese	2.00
Phosphorus	0.045 max
Sulfur	0.030 max
Silicon	1.00 max
Chromium	18.00 - 20.00
Nickel	8.00 - 11.00
Nitrogen	0.10 - 0.16

A; The intentional addition of Bi, Se, Te, and Pb is not permitted.

Mechanical Properties

Tensile Class	Diameter, Inch	Tensile Strength, min, ksi	Yield Strength, min, 0.2% offset, ksi	Elongation in 4D, min, %	Reduction of Area, min, %	Hardness, max
								Class 1A	All Sizes	75	30	30	50	192 HBW or 90 HRB

Heat Treatment: Carbide Solution Treated in Finished Condition.