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Home
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Fasteners
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Hex Bolts and Cap Screws
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A307 Hex Bolt, Galvanized
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1/4-20 X 3 A307 HEX BOLT, GALVANIZED
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1/4-20 X 3 A307 HEX BOLT, GALVANIZED
Item #:
HHG20250300
1/4-20 X 3 A307 HEX BOLT, GALVANIZED
$0.1504/EA
Quantity
Price
Quantity
Price
1
$0.1504/ EA
220
$0.14085/ EA
870
$0.12559/ EA
3920
$0.08273/ EA
Qty
In Stock
Add To Cart
Technical Data
Product Specification
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications
Product Specification
Diameter
1/4
Length
3
Thread Length
0.7500
Grades
Grade A307
Finish
Hot Dipped Galvanized
Weight
0.046029,
Governing Standards
Governing Standards
A307
ASTM A307
Covers the mechanical and material requirements for inch series fasteners in diameters from 1/4″ through 4″, made of carbon steel having a minimum tensile strength of 60,000 psi.
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.
A307 Material Marking
Mechanical Properties
Mechanical Properties
A307
Low Carbon Steel
Per ASTM A307-2014
Grade A
Diameter
Bolt or Stud Length
Tensile Strength
Elongation
Core Hardness (1)
Min psi
Min %
Rockwell
1/4 thru 4"
Less than 3 X dia (2)
60,000
18
B69 to B100
3 X dia and longer
60,000
18
B100
1. As measured anywhere on the surface or through the cross section.
2. Also bolts with drilled or undersized heads. These sizes and bolts with modified heads shall meet the minimum and maximum hardness as hardness is the only requirement.
Chemical Properties
Chemical Properties
A307
Per ASTM A307-2014
Grade A
Carbon
Manganese
Phosphorus
Sulfur
% by heat analysis
% by heat analysis
% by heat analysis
% by heat analysis
0.29
1.20
0.04
0.15
Dimensional Specifications
Dimensional Specifications
A307
Per ASME B18.2.1-2012
Nominal Diameter
UNC
UNF
E
F
G
H
LT
Body Diameter
Width Across Flats
Width Across Corners
Head Height
Thread Length
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Lengths up to 6"
Lengths > 6"
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
0.7500
1.0000
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
0.8750
1.1250
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
1.0000
1.2500
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
1.1250
1.3750
1/2
0.5000
13
20
0.5000
0.4930
3/4
0.7500
0.7360
0.8660
0.8400
5/16
0.3230
0.3020
1.2500
1.5000
9/16
0.5625
12
18
0.5625
0.5545
13/16
0.8120
0.7980
0.9380
0.9100
23/64
0.3710
0.3480
1.3750
1.6250
5/8
0.6250
11
18
0.6250
0.6170
15/16
0.9380
0.9220
1.0830
1.0510
25/64
0.4030
0.3780
1.5000
1.7500
3/4
0.7500
10
16
0.7500
0.7410
1 1/8
1.1250
1.1000
1.2990
1.2540
15/32
0.4830
0.4550
1.7500
2.0000
7/8
0.8750
9
14
0.8750
0.8660
1 5/16
1.3120
1.2850
1.5160
1.4650
35/64
0.5630
0.5310
2.0000
2.2500
1
1.0000
8
14
1.0000
0.9900
1 1/2
1.5000
1.4690
1.7320
1.6750
39/64
0.6270
0.5910
2.2500
2.5000
1 1/8
1.1250
7
12
1.1250
1.1140
1 11/16
1.6880
1.6310
1.9490
1.8590
11/16
0.7180
0.6580
2.5000
2.7500
1 1/4
1.2500
7
12
1.2500
1.2390
1 7/8
1.8750
1.8120
2.1650
2.0660
25/32
0.8130
0.7490
2.7500
3.0000
1 3/8
1.3750
6
12
1.3750
1.3630
2 1/16
2.0620
1.9940
2.3820
2.2730
27/32
0.8780
0.8100
3.0000
3.2500
1 1/2
1.5000
6
12
1.5000
1.4880
2 1/4
2.2500
2.1750
2.5980
2.4800
15/16
0.9740
0.9020
3.2500
3.5000
All dimensions are in inches.
Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″