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Home / Resources / ASTM A307

ASTM A307

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Carbon steel bolts and studs ranging from ¼” to 4”.

Scope – This specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar.

 

Grades

A Headed bolts, threaded rods and bent bolts intended for general applications.
B Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.

Mechanical Properties

Grade Markings Tensile, ksi Yield,
min, ksi
Elong %, min Hardness
A 307A 60 min — 18 B69-B100
B 307B 60 – 100 — 18 B69-B95

Chemical
Properties

Element Grade A Grade B
Carbon, max 0.29 0.29
Manganese, max 1.20 1.20
Phosphorus, max 0.04 0.04
Sulfur, max 0.15 0.05

Recommended
Mating Materials

Nuts Spec/Grade Washers Spec/Grade
A307 Grades A A307 Grade B
1/4 – 1-1/2 1-5/8 – 4 1/4 – 4
A563A Hex A563A Heavy Hex A563A Heavy Hex F844
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