GRADE AND MATERIAL IDENTIFICATION (Bolts, Screws, and Studs)

GRADE AND MATERIAL IDENTIFICATION (Bolts, Screws, and Studs)

ID Grade Mark

Specification

Part Description

Material

Nom Size Range

Yield (min psi)

Tensile (min psi)

Proof Load (psi)

No Grade Mark

ASTM A307 Grades A & B

Bolts, Screws, Studs

Low Carbon Steel

¼ thru 4

 

60,000

 

No Grade Mark

SAE J429 Grade 2

Bolts, Screws, Studs

Low or Medium

Carbon Steel

¼ thru ¾

Over 1 to 1 1/2

57,000

36,000

74,000

60,000

 

SAE J429 Grade 5

Bolts, Screws, Studs

Medium Carbon Steel Quenched and Tempered

¼ thru 1

Over 1 to 1 1/2

92,000

81,000

120,000

105,000

 

ASTM A449

Bolts, Screws, Studs

Medium Carbon Steel Quenched and Tempered

¼ thru 1

Over 1 to 1 1/2

Over 1 ½ thru 3

92,000

81,000

58,000

120,000

105,000

90,000

 

A325

ASTM A325 Type 1

High Strength Structural Bolts

Medium Carbon Steel Quenched and Tempered

½ thru 1

1 1/8 thru 1 1/2

92,000

81,000

120,000

105,000

 

SAE J429 Grade 8

Bolts, Screws, Studs

Medium Carbon Alloy Steel

Quenched and Tempered

¼ thru 1 1/2

130,000

150,000

 

A490

ASTM A490

High Strength Structural Bolts

Alloy Steel

Quenched and Tempered

½ thru 1 1/2

130,000

150,000 Min

170,000 Max

 

B6

ASTM A193

Bolts, Screws, Studs for High Temperature Service

AISI 410

¼ thru 4

85,000

110,000

 

B7

ASTM A193

Bolts, Screws, Studs for High Temperature Service

AISI 4140, 4142, or 4145

¼ thru 2 ½

Over 2 ½ thru 4

Over 4 thru 7

105,000

95,000

75,000

125,000

115,000

100.000

 

B8

ASTM A193

ASTM A320

Bolts, Screws, Studs for High or Low Temperature Service

AISI 304, Carbide Solution Treated

¼ and Larger

30,000

75,000

 

L7

ASTM A320

Bolts, Screws, Studs for Low Temperature Service

AISI 4140, 4142, or 4145 Quenched and Tempered

¼ thru 2 1/2

105,000

125,000