ASTM A193 Grade B8LN Class 1D Specification

ASTM A193 Grade B8LN Class 1D 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 B8LN Class 1D 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 B8LN Class 1D is a carbide solution treated 304LN stainless steel 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 B8LN Class 1D 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,
maxA
Class 1D All Sizes 75 30 30 50 223 HBW or 96 HRB

Heat Treatment: Carbide Solution Treated
A: For sizes 3⁄4 in. in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.

Recommended Nuts & Washers

Nut Specification Washer Specification
ASTM A194 Grade 8LN ASTM A240 TP304LN

Fasteners

Commonly Produced B8LN Class 1D Fasteners
Hex Bolts Heavy Hex Bolts Stud Bolts Threaded Rods Anchor Bolts
Eye Bolts Socket Head Cap Screws Countersunk Screws U Bolts Square Head Bolts