ASTM A307 Bolts

Manufacturer of ASTM A307 Bolts And Nuts, ASTM A307m Hex Nut

The mechanical, as well as chemistry requirements of carbon steel bolts, are covered by the ASTM A307 specification. The specification also takes into account three different grades of carbon steel bolts i.e. grade A, grade B and grade C. The designated grade for the specified ASTM A307 Bolts is indicative of not only their tensile strength but also intended use. For instance, the ASTM A307 Carbon Steel Bolts belonging to the category of grade A has a minimum tensile strength of about 60 KSI and has been designed to be used for general purposes. Secondly, those ASTM A 307 Screws belonging to category grade B have a tensile strength value which ranges between about 60 KSI to 100 KSI. As opposed to grade A, which is intended for general applications, grade B ASTM A307 Bolts And Nuts are consistently seen in applications involving flanged joints in piping systems, particularly with cast iron flanges.


On the other hand, the ASTM A307m Hex Nut belonging to category grade C has been officially replaced by another specification i.e. ASTM F1554 Gr.36, whose yield strength is about 36 KSI. Again, per the specification, the tested, sampled specimens, which in this case is the ASTM A307 Socket Head Fasteners are required to adhere to a set of specific values with regards to not only its chemistry but also hardness, elongation, tensile strength, yield point, and dimensions, all of which are under the mechanical property criteria. However, this being said, it is important to note that the A307 Material specification does not take into account parameters such as thread cutting / forming screws, mechanical expansion anchors,  machine screws, and other similar externally threaded fasteners as well.

ASTM A307 Bolts Grades

A ASTM A307 Grade A Rods, Bolts, Bends
B ASTM A307 Grade B Hex, Stud
C* ASTM A307 Grade C Anchor bolts

Call now to get ASTM A307 Socket Head Fasteners, ASTM A 307 Screws free sample

ASTM A307 Bolts And Nuts Chemical Composition Table

Grade Yield Strenght Tensile Strenght Elongational %
A -- 70 min 19
B -- 70 - 100 19
C 36 58 - 80 23

A307 Material Mechanical Properties Analysis

Element Grade A Grade B
C 0.20% 0.20%
P 0.06% 0.06%
M 1.20% 1.20%
S 0.13% 0.06%

Recommended Hardware of ASTM A307M Studs

Nuts Washers
Gr A & C* Gr B
1-5/8 - 4 1/4 - 1-1/2 1/5 - 4
Heavy Hex Heavy F844