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    2. ASTM A320/A320M Grade B8FA Class 1A

    ASTM A320/A320M Grade B8FA Class 1A Free-Machining Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 303 Selenium-Bearing Grade

    ASTM A320/A320M Grade B8FA Class 1A is a free-machining austenitic stainless steel bolting grade containing selenium to improve machinability. As the only ASTM A320 grade permitting intentional selenium addition, B8FA provides exceptional chip breaking characteristics and reduced tool wear during high-speed machining operations. Class 1A solution treatment ensures adequate corrosion resistance with maximum hardness of 192 HBW, making ASTM A320 Grade B8FA Class 1A is suitable for intricate fastener geometries, high-volume production runs, and low temperature applications where extensive machining is required and slightly reduced corrosion resistance is acceptable.

    ASTM A320/A320M Grade B8FA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8FA Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Se
    ASTM A320 B8FA Class 1A S30300(303) Range,% 0.15 2.00 0.20 00.15, min 1.00 8.0 - 10.0 17.0- 19.0 ...
    Product Variation, % Over or Under 0.15 2 0.2 0.06, max 1 8.0-10.0 17.0-19.0 0.15-0.35

    ASTM A320/A320M Grade B8FA Class 1A Stud Bolts Mechanical Requirements

    Austenitic Steels

    Grade and Class Diameter, in. [mm] Heat Treatment Tensile Strength, min, ksi [MPa] Yield Strength, min, ksi [MPa] (0.2 % offset) Elongation in 2 in. or 50 mm, min, % Reduction of Area, min, % Hardness, max
    ASTM A320 B8FA Class 1A All diameters carbide solution treated in the  finished condition 75 [515] 30 [205] 30 50 192 HBW or 90  HRB

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