## Do Bolts with Rolled Threads have a Full Body Diameter or a Reduced Body Diameter?

Roll threading fasteners with a reduced body is common for custom sized bolts on a job to job basis. However, there are circumstances where a bolt has been roll threaded but has a full body diameter. This is usually the case with mass produced A307 bolts and A325 and A490 heavy hex structural bolts, which are readily available and are usually smaller in size. In this case, full diameter steel wire rod is fed into an automated bolt maker which often times performs the cutting, heading, and threading operations in the same machine. After the bolt is cut to length and headed, the portion of the bolt that is to be threaded is extruded down to the pitch diameter prior to the thread being rolled onto the fastener. This results in a finished fastener that has been roll threaded, but would have a full size body diameter.

Size diameter, in. lbs./ft. diameter, in. lbs./ft.
3/8' - 16 0.330 0.291 0.375 0.376 22.6
1/2' - 13 0.445 0.529 0.500 0.668 20.8
5/8' - 11 0.562 0.843 0.625 1.043 19.2
3/4' - 10 0.680 1.235 0.750 1.500 17.7
7/8' - 9 0.797 1.696 0.875 2.044 17.0
1' - 8 0.912 2.221 1.000 2.670 16.8

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### Related FAQs

Suzy says:

I’m looking for a bolt that is not thread about 1 inch from top and the rest thread 5/8 inches wide by 5 inches long it goes at the bottom of a finishing mower to hold the pulley own

Dane McKinnon says:

@Suzy- Apologies, but we are a custom manufacturer of construction fastener and don’t typically get involved with bolts of this nature. A hardware store or the mower manufacturer might be better options.

VIKRAM says:

i want to calculate total bolt length for connecting thickness.

is there any mathematical calculation?

vikram,
india

@Vikram – you would take the thickness of the materials you are joining, add length for a nut/washer, plus any additional stick out needed, keeping in mind the thread length of the fastener. I don’t have any specific published formula to point to.