ASTM and SAE Specifications

ASTM and SAE
Specifications, Proof Loads, Tensile Strengths

Grade Marking

Specification

Material

Bolt and Screw
Size (Inches)

Proof Load
psi

Tensile Strength
min. psi

SAE Grade 1

ASTM A307

SAE Grade 2

Low Carbon Steel

1/4 thru 1-1/2
1/4 thru 1-1/2
Over 1-1/2 thru 4

1/4 thru 3/4
Over 3/4 thru 1-1/2

33000
33000
....

55000
33000

60000
60000
55000

74000
60000

SAE Grade 3

Med. Carbon Steel
Cold Worked

1/4 thru 1/2
Over 1/2 thru 5/8

85000
80000

110000
100000

SAE Grade 5

ASTM A449

Med. Carbon Steel
Quenched and
Tempered

1/4 thru 1
Over 1 thru 1-1/2

1/4 thru 1
Over 1 thru 1-1/2
Over 1-1/2 thru 3

85000
74000

85000
74000
55000

120000
105000

120000
105000
90000

ASTM A325

Med. Carbon Steel
Quenched and
Tempered

1/2, 5/8, 3/4
7/8, 1
1-1/8 thru 1-1/2

85000
78000
74000

120000
115000
105000

ASTM A354
Grade BB

Low Alloy Steel
Quenched and
Tempered

1/4 thru 2-1/2
Over 2-1/2 thru 4

80000
75000

105000
100000

ASTM A354
Grade BC

Low Alloy Steel
Quenched and
Tempered

1/4 thru 2-1/2
Over 2-1/2 thru 4

105000
75000

125000
100000

SAE Grade 5.1

Low or Med
. Carbon
Steel Quenched
and
Tempered with
Assembled Lock
Washer

Up to 3/8 incl.

85000

120000

SAE Grade 7

Med. Carbon Alloy
Steel Quenched
and
Tempered. Roll
Threaded after
Heat
Treated

1/4 thru 1-1/2

105000

133000

SAE Grade 8

ASTM A354
Grade BD

Med. Carbon Alloy
Steel, Quenched
and
Tempered

Alloy Steel
Quenched
and Tempered

1/4 thru 1-1/2

120000

150000

ASTM A490

Alloy Steel,
Quenched and
Tempered

1/2 thru 2-1/2
Over 2-1/2 thru 4

120000
105000

150000
140000

ASTM Specifications:
A 307: Low Carbon Steel Externally and Internally Threaded Standard Fasteners
A 325: High Strength Steel Bolts for Structural Steel Joints, including Suitable Nuts and Plain Hardened Washers
A 449: Quenched and Tempered Steel Bolts and Studs
A 354: Quenched and Tempered Alloy Steel Bolts and Studs with Suitable Nuts
A 490: High Strength Alloy Steel Bolts for Structural Steel Joints, including Suitable Nuts and Plain Hardened Washers
SAE Specification:
J 429c: Mechanical and Quality Requirements for Threaded Fasteners