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5/8-11 X 3 1/4 A193 B7 Heavy Hex Bolt

Selected A193 Grade B7 Heavy Hex Bolt Black OxideB7 Heavy Hex Bolt
A193 Grade B7 Heavy Hex Bolt Black OxideB7 Heavy Hex Bolt

Product Specification

Length
3 1/4
Thread Length
1.5000
Grade
Grade B7
Finish
Black
Weight
0.360625
Diameter
5/8

Mechanical Properties

Chromium-Molybdenum, Quenched & Tempered Per ASTM A193/A193M-16
Diameter Tempering
Temperature		 Tensile
Strength		 Yield Strength min,
0.2% offset		 Elongation
in 4D		 Reduction
in Area		 Hardness
Min Min ksi ksi Min % Min % Max
up to 2 1/2" 1100F 125 105 16 50 321 HBW or 35 HRC
over 2 1/2" to 4" 1100F 115 95 16 50 321 HBW or 35 HRC
over 4 to 7" 1100F 100 75 18 50 321 HBW or 35 HRC

Chemical Properties

Per ASTM A193/A193M-16
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Molybdenum
% by   weight % by weight % by weight % by weight % by weight % by weight % by weight
B7 Chromium-Molybdenum (1) 0.38-0.48 (2) 0.75-1.00 0.035 max 0.04 max 0.15-0.35 0.80-1.10 0.15-0.25
  1. 1. Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.
  2. 2. For bar sizes over 3 1/2 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.

Dimensional Specifications

Heavy Hex Bolt dimensions
Per ASME B18.2.1-2012
Nominal Diameter UNC UNF UN8 E F G H
Body Diameter Width Across Flats Width Across Corners Head Height
Max Min Basic Max Min Max Min Basic Max Min
1/4 0.2500 20 28   0.2500 0.2405 7/16 0.4380 0.4280 0.5050 0.4880 5/32 0.1630 0.1500
5/16 0.3125 18 24   0.3125 0.3065 1/2 0.5000 0.4890 0.5770 0.5570 13/64 0.2110 0.1950
3/8 0.3750 16 24   0.3750 0.3690 9/16 0.5620 0.5510 0.6500 0.6280 15/64 0.2430 0.2260
7/16 0.4375 14 20   0.4375 0.4305 5/8 0.6250 0.6120 0.7220 0.6980 9/32 0.2910 0.2720
1/2 0.5000 13 20   0.515 0.482 7/8 0.875 0.850 1.010 0.969 11/32 0.364 0.302
5/8 0.6250 11 18   0.642 0.605 1 1/16 1.062 1.031 1.227 1.175 27/64 0.444 0.378
3/4 0.7500 10 16   0.768 0.729 1 1/4 1.250 1.212 1.443 1.383 1/2 0.524 0.455
7/8 0.8750 9 14   0.895 0.852 1 7/16 1.438 1.394 1.660 1.589 37/64 0.604 0.531
1 1.0000 8 14   1.022 0.976 1 5/8 1.625 1.575 1.876 1.796 43/64 0.700 0.591
1 1/8 1.1250 7 12 8 1.149 1.098 1 13/16 1.812 1.756 2.093 2.002 3/4 0.780 0.658
1 1/4 1.2500 7 12 8 1.277 1.223 2 2.000 1.938 2.309 2.209 27/32 0.876 0.749
1 3/8 1.3750 6 12 8 1.404 1.345 2 3/16 2.188 2.119 2.526 2.416 29/32 0.940 0.810
1 1/2 1.5000 6 12 8 1.531 1.470 2 3/8 2.375 2.300 2.742 2.622 1 1.036 0.902

All dimensions are in inches.

Governing Standards

ASTM A193 Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.1 Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Grade B7 Head Marking
Grade B7 Material Marking

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