A307B Bolts are commonly used for flange joints in piping systems with cast iron flanges and have a tensile strength between 60-100 KSI. These are very similar to A307A, the only variant are the head dimensions: A307A bolts use a standard hex head whereas the A307B bolts use a heavy hex head. This spec ranges in diameters of ¼” to 4”.
Grades: 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
C: Non-headed anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a Grade C anchor bolt is intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplementary requirement.
All A307B Bolts are to be used with A563 Grade A Nuts.
All A307B Bolts are to be used with standard F844 Washers (SAE + USS)