ASTM A325 Type 1 Specification

ASTM A325 Type 1 Specification for heat treated carbon and alloy steel structural bolts, steel, heat treated with 120 ksi Minimum Tensile Strength

ASTM A325 Type 1 is a standard material specification for high strength carbon steel fasteners, for use in high tensile structural bolting and other general purpose applications. Type 1 is a quenched and tempered carbon steel, alloy steel or boron steel bolting material with minimum tensile requirement of 105 ksi, yield 81 ksi and maximum hardness requirement of 34 HRC. This specification is used for manufacturing heavy profile bolts, screws, stud bolts, threaded rods, anchor bolts and other externally threaded fasteners. A325 specification covers requirements for chemical composition, mechanical properties, hardness, heat treatment, recommended nuts-washers for Type 1 fasteners.

Chemical Composition

Element Type 1, %
Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon 0.28 - 0.55 0.28 - 0.55 0.28 - 0.55 0.28 - 0.55
Manganese 0.57 min 0.57 min 0.57 min 0.57 min
Phosphorus 0.048 max 0.048 max 0.040 max 0.040 max
Sulfur 0.058 max 0.058 max 0.045 max 0.045 max
Silicon 0.13 - 0.32 0.08 - 0.32 0.13 - 0.37 0.13 - 0.37
Boron ... 0.0005 - 0.003 ... 0.0005 - 0.003

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
Plain Galvanized
ASTM F436 Type 1
ASTM A563 Grade C, C3, D, DH, DH3 ASTM A563 Grade DH