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Fastener Identification Marking for Bolts
Grade
Identification
Marking
Specification
Material
Nominal Size In.
Proof
Load
Stress
ksi
Tensile
Strength
Min
ksi
Hardness
Rockwell
Min
Max
SAE J429 - Grade 1
Low or Medium Carbon Steel
1/4 thru 1 1/2
33
60
B70
B100
SAE J429 - Grade 2
1/4 thru 3/4
over 3/4 thru
1 1/2
55
33
74
60
B80
B70
B100
B100
ASTM A307 - Grade A
1/4 thru 4
--
60
B69
B100
ASTM A307 - Grade B
1/4 thru 4
--
60 min
100 max
B69
B95
SAE J429 - Grade 5
ASTM A449 -- Type 1
Medium Carbon Steel, Quenched and Tempered
1/4 thru 1
over 1 thru
1 1/2
85
74
120
105
C25
C19
C34
C30
ASTM A449 -- Type 1
over 1/2 thru 3
55
90
183
235
SAE J429 -- Grade 5.1
Low or Medium Carbon Steel, Quenched and Tempered
No. 6 thru 1/2
85
120
C25
C40
SAE J429 -- Grade 5.1
Low Carbon Martensite Steel, Quenched and Tempered
1/4 thru 1
85
120
C26
C36
ASTM A449 -- Type 2
C25
C34
ASTM A325 -- Type 1
Medium Carbon Steel, Quenched and Tempered
1/2 thru 1
over 1 to 1 1/2
85
74
120
105
C24
C19
C35
C31
ASTM A325 -- Type 2
Low Carbon Steel, Quenched and Tempered
ASTM A325 -- Type 3
Atmospheric Corrosion
Resistant Steel, Quenched and Tempered
Zero Products, Inc.

219 Baywood
Houston, TX 77011
Toll Free: 800-991-1280
Fax: 713-675-6066
Local: 713.675.0123

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