ASTM A307 Grade B Bolts

The ASTM A307 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. RELIABLE PIPES & TUBES LTD. Manufacturer,Stocks & Supplies Bolts,Studs,Threaded Bars as Specified under ASTM A307 Grade B.

Mechanical Properties


Grade Tensile, ksi Yield, min, ksi Elong %, min
A 60 min -- 18
B 60 - 100 -- 18
C* 58 - 80 36 23

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%
Sulphur, Max 0.15% 0.05%