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Tool King Hardware Resources
Resources that help you build on knowledge.
Bolt Markings Identification Guide
  
Use this identification guide to identify the strength of bolts by their markings and determine which grade of fasteners you will need for the job.
Hardware Resources
Bolt Markings Identification Guide
SAE Standard
ASTM Standard
SAE Standard |
Markings
|
Grade
|
Materials
|
Types |
Minimum Tensile Strength
|
Proof of Stress
|
 |
Grade 60M - SAE J82 |
Carbon Steel |
Machine Screws |
60,000
|
n/a
|
| |
Grade 120M - SAE J82 |
Quenched / Tampered Carbon Steel |
Machine Screws |
120,000 |
n/a |
| |
Grade 1 - SAE J429 |
Low - Medium Carbon Steel |
Bolts, Screws, Studs |
60,000 |
33,000 |
| |
Grade 2 - SAE J429 |
Low - Medium Carbon Steel |
Bolts, Screws, Studs |
74,000
( ¼”
- ¾”)
60,000
( 7/8” – 1 ½”) |
55,000
( ¼”
- ¾”)
33,000
( 7/8” – 1 ½”) |
| |
Grade 5 - SAE J429 |
Quenched / Tampered Med. Carbon Steel |
Bolts, Screws, Studs |
120,000
(
¼” – 1”)
105,000
(1 1/8” – 1 ½”) |
85,000
( ¼” – 1”)
74,000
(1 1/8” – 1 ½”) |
 |
Grade 5.1 - SAE J429 |
Quenched / Tampered Med. Carbon Steel |
Bolts, Screws, Studs |
120,000 |
85,000 |
| |
Grade 5.2 - SAE J429 |
Quenched / Tampered Low Carbon Martensite Steel |
Bolts, Screws, Studs |
120,000 |
85,000 |
 |
Grade 7 - SAE J429 |
Quenched / Tampered Med. Carbon Alloy Steel |
Bolts, Screws, Studs |
133,000 |
105,000 |
| |
Grade 8 - SAE J429 |
Quenched / Tampered Med. Carbon Alloy Steel |
Bolts, Screws, Studs |
150,000 |
120,000 |
 |
Grade 8.2 - SAE J429 |
Quenched / Tampered Low Carbon Martensite Steel |
Bolts, Screws, Studs |
150,000 |
120,000 |
|
ASTM
Standards
|
 |
A307 Grade-A |
Low - Medium Carbon Steel |
Bolts, Studs |
60,000 |
n/a |
 |
A307 Grade-B |
Low - Medium Carbon Steel |
Bolts, Studs |
60,000 |
n/a |
 |
A325 Type-1 |
Medium Carbon, Carbon-Boron, Carbon Alloy Steel |
Structural, Anchor Bolts |
120,000 (
½” – 1”)
105,000
(1 1/8” – 1 ½”)
|
85,000 ( ½”
– 1”)
74,000
(1 1/8” – 1 ½”)
|
| |
A325 Type-3 |
Quenched / Tampered Corrosion Resistant Steel |
Bolts, Studs |
120,000 |
85,000 |
|
A354 Grade - BC |
Quenched / Tampered Med. Carbon Alloy Steel |
Bolts, Studs |
125,000 (
¼” – 2 ½”)
115,000
(2 5/8” – 4”) |
105,000 ( ¼” – 2 ½”)
95,000 (2 5/8” – 4”)
|
| |
A354 Grade - BD |
Quenched / Tampered Med. Carbon Alloy Steel |
Bolts, Studs |
150,000 (
¼” – 2 ½”)
140,000
(2 5/8” – 4”) |
120,000 ( ¼” – 2 ½”)
105,000 (2 5/8” – 4”) |
| |
A449 Type-1 |
Quenched / Tampered Low / Med. Carbon Steel |
Bolts, Studs |
120,000 (
¼” – 1”)
105,000 (1
1/8” – 1 ½”)
90,000
(1 ¾” – 3”) |
85,000 ( ¼”
– 1”)
74,000 (1
1/8” – 1 ½”)
55,000
(1 ¾” – 3”) |
| |
A449 Type-2 |
Quenched / Tampered Low / Med. Carbon Martensite
Steel |
Bolts, Studs |
120,000 |
85,000 |
| |
A490 Type-1 |
Quenched / Tampered Med. Carbon Alloy Steel |
Structural Bolts |
150,000 |
120,000 |
| |
A490 Type-2 |
Quenched / Tampered Low Carbon Martensite Steel |
Structural Bolts |
150,000 |
120,000 |
| |
A490 Type-3 |
Quenched / Tampered Corrosion Resistant Steel |
Structural Bolts |
150,000 |
120,000 |
| |
A574 |
Quenched / Tampered Carbon Alloy Steel |
Screws |
180,000 (#0
– ½”)
170,000
(5/8” – 4”) |
140,000 (#0
– ½”)
135,000
(5/8” – 4”) |
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