This writeup covers tensile testing of carbon steel bolts and rods. These materials can be seperated based on their Grades - either A, B, or C. The grade specifies the tensile strength of the steel. Grade A studs and threaded rods have a minimum tensile strength of 60 ksi and are intended for general uses. Bolts with a tensile strength between 60 and 100 ksi are labeled as Grade B. Higher Strength materials in Grade C now fall under the slightly different specificaiton which is F1554 which is used for structural applications.
The tensile rods can range from one quarter of an inch all the way up to 4 inches. There is no reduced section with these samples and they are usually tested "as is" as opposed to being machined into a dogbone style specimen.
ASTM A307 is relatively simple to perform. Bolt Grips are used on a material testing system. There are slightly different varieties of threaded gripes depending on if the sample rods are externally threaded, or just headed with a Hex nut.
Tensile strength, Elongation, and yield strength are the 3 main results for this type of test. Universal Grip carries all of the equipment needed to perform this type of test including software for data analysis.
ASTM A370 - Test Methods for Steel Products