Application:

A307B Bolts are commonly used for flange joints in piping systems with cast iron flanges. A307B Bolts have a tensile strength range of 60-100 KSI. These are very similar to A307 Grade A, only the head dimensions are different; A307A uses a standard Hex head where as the A307B Bolts use a Heavy hex head. This spec ranges in diameters of ¼” – 4”.

A307B Bolts

A307B Bolts

Grades

AHeaded bolts, threaded rods and bent bolts intended for general applications.
BHeavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
CNonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement.

Chemical Properties

ElementGrade AGrade B
Carbon, max0.29%0.29%
Manganese, max1.20%1.20%
Phosphorus, max0.04%0.04%
Sulfur, max0.15%0.05%

Recommended Nuts

All A307B Bolts are to be used with A563 Grade A Nuts.

Recommended Washers

All A307B Bolts are to be used with standard F844 Washers (SAE + USS)

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