Tap Bolts

Hex tap bolts (also known as fully-threaded hex bolts) most prominent feature is their pointed end. AFT supplies hex tap bolts in grades 2, 5, and 8, as well as stainless steel.

Frequently Asked Questions

What is a tap bolt used for?

Tap bolts are used in a drilled or tapped hole where a cap screw or nut would be impractical. They are most commonly used in automotive and industrial applications.

What’s the difference between a tap bolt and a hex bolt?

The threading is the main difference: standard hex bolts have an unthreaded shoulder or shank beneath the head, whereas tap bolts are threaded from the tip to the base of the hex head.

What grades are tap bolts available in?

Tap bolts are available in grades 2, 5, and 8.

Grade 2 tap bolts are a low carbon, hex head bolt with a machined point and fully threaded, made from AISI 1006-1025 or equivalent steel.
Grade 5 tap bolts are a fully threaded hex bolt that are heat treated and made from AISI 1541 or equivalent medium carbon steel, or 4037 modified steel (alloy).
Grade 8 tap bolts are heat treated and made from medium carbon alloy.

How do I choose the right tap bolt?

Grade 2 tap bolts are typically used in full length threaded drilled or tapped holes instead of a stud or nut.
If you’re looking specifically for automotive applications, such as to mount motors to machinery, Grade 5 may be the best fit.
For automotive or fleet applications where greater tensile strength is needed, Grade 8 is what is needed.
Stainless steel tap bolts are used when the application is an environment corrosive to carbon steel.

Do tap bolts require a nut?

Not always, one of the primary benefits of a tap bolt is that they do not require a nut in most cases. However, if you are fastening through unthreaded materials or if the assembly doesn’t include a tapped hole, a nut may be necessary.