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Home
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Fasteners
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Hex Bolts and Cap Screws
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B7 Heavy Hex Bolt
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1-8 X 3 1/4 A193 B7 HEAVY HEX BOLT
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1-8 X 3 1/4 A193 B7 HEAVY HEX BOLT
Item #:
HHB71000325-I
1-8 X 3 1/4 A193 B7 HEAVY HEX BOLT
$6.55843/EA
Quantity
Price
Quantity
Price
1
$6.55843/ EA
40
$6.18648/ EA
80
$5.45414/ EA
180
$3.84167/ EA
Qty
In Stock
Add To Cart
Technical Data
Product Specification
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications
Substitute Products
Product Specification
Diameter
1
Length
3 1/4
Thread Length
2.2500
Grades
Grade B7
Finish
Black
Weight
1.04,
Governing Standards
Governing Standards
Grade B7
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 Material Marking
Mechanical Properties
Mechanical Properties
Grade B7
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
Chemical Properties
Grade B7
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. Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.
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
Dimensional Specifications
Grade B7
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.
Substitute Products
1-8 X 3 1/4 A193 B7 HEAVY HEX BOLT,TEFLON
$13.39335/EA
View Options
1-8 X 3 1/4 A193 B7 HEAVY HEX BOLT,TEFLON
$13.39335/EA
View Options