Fastener Grade Markings | Fastener Guides | Tri Suppli

FASTENER Grade Markings Guide

Identification
Grade Mark

Specification

Fastener Description

Material

Nominal Size Range (Inch)

No Head Marking
No Grade Marking

SAE J429
Grade 1

Bolts,
Screws,
Studs

Low / Medium
Carbon Steel

1/4 thru1-1/2

ASTM A307
Grades A&B

Low
Carbon Steel

1/4 thru 4

SAE J429
Grade 2

Low / Medium
Carbon Steel

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


No Grade Marking

SAE J429
Grade 4

Studs

Medium
Carbon Cold
Drawn Steel

1/4 thru 1-1/2


B5

ASTM A193
Grade B5

AISI 501

1/4 thru 4


B6

ASTM A193
Grade B6

AISI 410


B7

ASTM A193
Grade B7

AISI 4140,
4142, 4105

1/4 thru 2-1/2
Over 2-1/2 thru 4
Over 4 thru 7


B16

ASTM A193
Grade B16

CrMoVa
Alloy Steel


B8

ASTM A193
Grade B8

AISI 304

1/4 and larger


B8C

ASTM A193
Grade B8C

AISI 347


B8M

ASTM A193
Grade B8M

AISI 316


B8T

ASTM A193
Grade B8T

Bolts,
Screws,
Studs
for
High-Temperature
Service

AISI 321

1/4 and larger


B8

ASTM A193
Grade B8

AISI 304
Strain Hardened

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


B8C

ASTM A193
Grade B8C

AISI 347
Strain Hardened


B8M

ASTM A193
Grade B8M

AISI 316
Strain Hardened


B8T

ASTM A193
Grade B8T

AISI 321
Strain Hardened


L7

ASTM A320
Grade L7

Bolts,
Screws,
Studs
for
Low-Temperature
Service

AISI 4140,
4142, 4145

1/4 thru 2-1/2


L7A

ASTM A320
Grade L7A

AISI 4037


L7B

ASTM A320
Grade L7B

AISI 4137


L7C

ASTM A320
Grade LC7

AISI 8740


L43

ASTM A320
Grade L43

AISI 4340

1/4 thru 4


B8

ASTM A320
Grade B8

Bolts,
Screws,
Studs
for
Low-Temperature
Service

AISI 304

1/4 and larger


B8C

ASTM A320
Grade B8C

AISI 347


B8T

ASTM A320
Grade B8T

AISI 321


B8F

ASTM A320
Grade B8F

AISI 303 or 303Se


B8M

ASTM A320
Grade B8M

AISI 316


B8

ASTM A320
Grade B8

AISI 304

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


B8C

ASTM A320
Grade B8C

AISI 347


B8F

ASTM A320
Grade B8F

AISI 303 or 303Se


B8M

ASTM A320
Grade B8M

AISI 316


B8T

ASTM A320
Grade B8T

AISI 321

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SAE J429
Grade 5

Bolts,
Screws,
Studs

Medium Carbon Steel,
Quenched and Tempered

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

ASTM A449

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

SAE J429
Grade 5.1

Sems

Low / Medium Carbon Steel,
Quenched and Tempered

No. 6 thru 3/8

SAE J429
Grade 5.2

Bolts,
Screws,
Studs

Low Carbon
Martensitic Steel,
Quenched and Tempered

1/4 thru 1


A325

ASTM A325
Type 1

High Strength
Structural Bolts

Medium
Carbon Steel,
Quenched and Tempered

1/2 thru 11-1/8
thru 1-1/2


A325

ASTM A325
Type 2

Low Carbon
Martensitic Steel,
Quenched and Tempered

1/2 thru 1


A325

ASTM A325
Type 3

Atmospheric
Corrosion Resisting Steel,
Quenched and Tempered

1/2 thru 11-1/8 thru 1-1/2


BB

ASTM A354
Grade BB

Bolts,
Studs

Alloy Steel,
Quenched and Tempered

1/4 thru 2-1/22-3/4 thru 4


BC

ASTM A354
Grade BC

SAE J429
Grade 7

Bolts,
Screws

Medium Carbon
Alloy Steel,
Quenched and Tempered

1/4 thru
1-1/2

SAE J429
Grade 8

Bolts,
Screws,
Studs

Medium Carbon
Alloy Steel,
Quenched and Tempered

1/4 thru 1-1/2

ASTM A354
Grade BD

Alloy Steel,
Quenched and Tempered


No Grade Marking

SAE J429
Grade 8.1

Studs

Medium Carbon Alloy
SAE 1041
Modified Elevated Temperature
Drawn Steel

1/4 thru
1-1/2


A490

ASTM A490

High Strength
Structural Bolts

Alloy Steel,
Quenched and Tempered

1/2 thru
1-1/2

 

DISCLAIMER

All the information provided in this section has been assembled with concern for accuracy. It is intended for advisory purposes only and use of this information is completely voluntary. We do not guarantee its completeness or validity and assume no responsibility for any loss, claims or damages resulting from use or application of this information. All information is subject to change without prior notice. Be sure to verify!All the information provided in this section has been assembled with concern for accuracy. It is intended for advisory purposes only and use of this information is completely voluntary. We do not guarantee its completeness or validity and assume no responsibility for any loss, claims or damages resulting from use or application of this information. All information is subject to change without prior notice.