Grade Markings For Steel Bolts And Screws
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Grade Markings for Steel Bolts and Screws Physical Properties
Specifications Material
Bolt and Screw Size (in.)
Physical Properties
Tensile Proof Strength Load Min. (psi) (psi)
SAE - Grade 0
Steel
Up to 1-1/2"
-
-
SAE - Grade 1
Low Carbon Steel
Up to 1-1/2"
-
55,000
ASTM - A 307
Low Carbon Steel
All Sizes
-
55,000
SAE - Grade 2
Low Carbon Steel
Up to 1-1/2"
55,000
69,000
Over 1/2" to 52,000 3/4"
64,000
Over 3/4" to 28,000 1-1/2"
55,000
Physical Properties
Specifications Material
Bolt and Screw Size (in.)
Tensile Proof Strength Load Min. (psi) (psi)
Medium Carbon SAE - Grade 3 Steel, Cold Worked
Up to 1/2"
85,000 110,000
Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
Low Alloy Steel, ASTM - A Steel, Up to 80,000 354 Grade BB Quenched 2-1/2" and Tempered
105,000
Over 2-1/2" to 4"
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Low Alloy Steel, ASTM - A Steel, Up to 105,000 125,000 354 Grade BC Quenched 2-1/2" and Tempered Over 2-1/2" 95,000 to 4"
Over 3/4" to 5/8"
Bolt and Screw Size (in.)
115,000
Physical Properties
Physical Properties Specifications Material
Tensile Strength Min. (psi)
Proof Tensile Load Strength (psi) Min.
Bolt and Proof Specifications Material Screw Lead Size (psi) (in.) SAE-Grade 7
Medium
Tensile Strength Min. (psi)
Up to 105,000 133,000
(psi) Medium Carbon Steel, SAE - Grade 5 Quenched & Tempered
Up to 3/4"
85,000 110,000
Over 3/4" to 78,000 115,000 1" Over 1" to 1-1/2"
74,000 105,000
Up to 3/4"
85,000 120,000
Over 1" to 1-1/2"
74,000 105,000
Over 1" to 3" 55,000
90,000
Physical Properties
Specifications Material
ASTM - A 325
Bolt and Screw Size (in.)
Tensile Proof Strength Load Min. (psi) (psi)
Medium Carbon Steel, 1/2",5/8",3/4" 85,000 120,000 Quenched & Tempered 7/8",1"
78,000 115,000
1-1/8" to 1-1/2"
74,000 105,000
Physical Properties
Specifications Material SAE - Grade 5.1
Low or Medium Carbon Steel,
Bolt and Screw Size (in.) Up to 3/8" incl.
Tensile Proof Strength Load Min. (psi) (psi) 85,000 120,000
Carbon Alloy Steel , Quenched & 1/2" Tempered, Roll Threaded after heat treatment
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
Medium Carbon Alloy Up to SAE - Grade 8 Steel, 120,000 150,000 1/2" Quenched & Tempered
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
High Strength Structural 1/2" to ASTM A 490 120,000 150,000 Bolts, 2-1/2" Alloy Steel Over 2-1/2" 105,000 to 4"
140,0
Quenched & Tempered Screw with Assembled Lock Washer
Specifications Material
Bolt and Screw Size (in.)
Physical Properties
Tensile Proof Strength Load Min. (psi) (psi)
SAE - Grade 0
Steel
Up to 1-1/2"
-
-
SAE - Grade 1
Low Carbon Steel
Up to 1-1/2"
-
55,000
ASTM - A 307
Low Carbon Steel
All Sizes
-
55,000
SAE - Grade 2
Low Carbon Steel
Up to 1-1/2"
55,000
69,000
Over 1/2" to 52,000 3/4"
64,000
Over 3/4" to 28,000 1-1/2"
55,000
Physical Properties
Specifications Material
Bolt and Screw Size (in.)
Tensile Proof Strength Load Min. (psi) (psi)
Medium Carbon SAE - Grade 3 Steel, Cold Worked
Up to 1/2"
85,000 110,000
Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
Low Alloy Steel, ASTM - A Steel, Up to 80,000 354 Grade BB Quenched 2-1/2" and Tempered
105,000
Over 2-1/2" to 4"
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Low Alloy Steel, ASTM - A Steel, Up to 105,000 125,000 354 Grade BC Quenched 2-1/2" and Tempered Over 2-1/2" 95,000 to 4"
Over 3/4" to 5/8"
Bolt and Screw Size (in.)
115,000
Physical Properties
Physical Properties Specifications Material
Tensile Strength Min. (psi)
Proof Tensile Load Strength (psi) Min.
Bolt and Proof Specifications Material Screw Lead Size (psi) (in.) SAE-Grade 7
Medium
Tensile Strength Min. (psi)
Up to 105,000 133,000
(psi) Medium Carbon Steel, SAE - Grade 5 Quenched & Tempered
Up to 3/4"
85,000 110,000
Over 3/4" to 78,000 115,000 1" Over 1" to 1-1/2"
74,000 105,000
Up to 3/4"
85,000 120,000
Over 1" to 1-1/2"
74,000 105,000
Over 1" to 3" 55,000
90,000
Physical Properties
Specifications Material
ASTM - A 325
Bolt and Screw Size (in.)
Tensile Proof Strength Load Min. (psi) (psi)
Medium Carbon Steel, 1/2",5/8",3/4" 85,000 120,000 Quenched & Tempered 7/8",1"
78,000 115,000
1-1/8" to 1-1/2"
74,000 105,000
Physical Properties
Specifications Material SAE - Grade 5.1
Low or Medium Carbon Steel,
Bolt and Screw Size (in.) Up to 3/8" incl.
Tensile Proof Strength Load Min. (psi) (psi) 85,000 120,000
Carbon Alloy Steel , Quenched & 1/2" Tempered, Roll Threaded after heat treatment
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
Medium Carbon Alloy Up to SAE - Grade 8 Steel, 120,000 150,000 1/2" Quenched & Tempered
Physical Properties Bolt and Proof Specifications Material Screw Lead Size (psi) (in.)
Tensile Strength Min. (psi)
High Strength Structural 1/2" to ASTM A 490 120,000 150,000 Bolts, 2-1/2" Alloy Steel Over 2-1/2" 105,000 to 4"
140,0
Quenched & Tempered Screw with Assembled Lock Washer
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