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ASTM A325
Specification-NINGBO BOLT |
ASTM A325
Specification
ASTM A325
Specification for heat treated carbon & weathering steel bolts, steel with 120
ksi Minimum Tensile Strength, for use in structural bolting applications.
ASTM A325
specification covers two types of quenched and tempered steel heavy hex bolts in
metric and imperial sizes for structural purpose. The specification includes
type 1 & type 3 fastener material intended for structural bolting purpose. Type
1 is a heat treated high strength plain carbon, carbon-boron, alloy steel or
alloy boron steel bolting materials with minimum tensile requirement of 105 ksi,
yield 81 ksi and maximum hardness limit of 25 - 35 HRC. Type 3 is heat treated
weathering steel bolting material with similar strength requirement to type 1
but greater corrosion protection and are prominently used in humid weather
conditions.
Bolt Grades
|
Grade |
Class /
Description |
|
Type 1 |
Carbon
Steel, Carbon Boron Steel, Alloy Steel or Alloy Boron Steel |
|
Type 2 |
Withdrawn |
|
Type 3 |
Weathering
Steel |
|
A |
B |
C |
D |
E |
F |
Chemical Composition
|
Element |
Type 1, % |
Type 3, % |
|
Carbon Steel |
Carbon Boron
Steel |
Alloy Steel |
Alloy Boron
Steel |
A |
B |
C |
D |
E |
F |
|
Carbon |
0.28 - 0.55 |
0.28 - 0.55 |
0.28 - 0.55 |
0.28 - 0.55 |
0.31 - 0.42 |
0.36 - 0.50 |
0.14 - 0.26 |
0.14 - 0.26 |
0.18 - 0.27 |
0.19 - 0.26 |
|
Manganese |
0.57 min |
0.57 min |
0.57 min |
0.57 min |
0.86 - 1.24 |
0.67 - 0.93 |
0.76 - 1.39 |
0.36 - 1.24 |
0.56 - 1.04 |
0.86 - 1.24 |
|
Phosphorus |
0.048 max |
0.048 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
|
Sulfur |
0.058 max |
0.058 max |
0.045 max |
0.045 max |
0.045 max |
0.045 max |
0.045 max |
0.045 max |
0.045 max |
0.045 max |
|
Silicon |
0.13 - 0.32 |
0.08 - 0.32 |
0.13 - 0.37 |
0.13 - 0.37 |
0.13 - 0.37 |
0.25 - 0.55 |
0.13 - 0.37 |
0.20 - 0.55 |
0.13 - 0.37 |
0.13 - 0.37 |
|
Boron |
... |
0.0005 -
0.003 |
... |
0.0005 -
0.003 |
... |
... |
... |
... |
... |
... |
|
Copper |
... |
... |
... |
... |
0.22 - 0.48 |
0.17 - 0.43 |
0.17 - 0.53 |
0.27 - 0.53 |
0.27 - 0.63 |
0.17 - 0.43 |
|
Nickel |
... |
... |
... |
... |
0.22 - 0.48 |
0.47 - 0.83 |
0.22 - 0.53 |
0.47 - 0.83 |
0.27 - 0.63 |
0.17 - 0.43 |
|
Chromium |
... |
... |
... |
... |
0.42 - 0.68 |
0.47 - 0.83 |
0.27 - 0.53 |
0.45 - 1.05 |
0.55 - 0.95 |
0.42 - 0.68 |
|
Vanadium |
... |
... |
... |
... |
... |
... |
0.010 min |
... |
... |
... |
|
Molybdenum |
... |
... |
... |
... |
... |
0.07 max |
... |
0.11 max |
... |
... |
|
Titanium |
... |
... |
... |
... |
... |
... |
... |
0.06 max |
... |
... |
Mechanical Properties
|
Nominal
Diameter,
Inch |
Tensile
Strength, min,
ksi |
Yield
Strength, min,
ksi |
Elongation
in 4D, min,
% |
Reduction
in Area, min,
% |
Bolt
Length,
Inch |
Brinell |
Rockwell
C |
|
Min |
Max |
Min |
Max |
|
1/2" to 1",
Inclusive |
120 |
92 |
14 |
35 |
Less than
2D
2D and over |
253
... |
319
319 |
25
... |
34
34 |
|
Over 1 to
1-1/2" |
105 |
81 |
14 |
35 |
Less than
3D
3D and over |
223
... |
286
286 |
19
... |
30
30 |
where D is nominal
diameter or thread size.
Recommended Nuts &
Washers
|
Nuts |
Washers |
|
Type 1 |
Type 3 |
Type 1 |
Type 3 |
|
Plain |
Galvanized |
Plain |
|
ASTM A563
Grade C, C3, D, DH, DH3 |
ASTM A563
Grade DH |
ASTM A563
Grade C3, DH3 |
ASTM F436
Type 1 |
ASTM F436
Type 3 |
|
