19 Oct Bolt vs Setscrew: Understanding the Difference
Avoid mix-ups with our quick guide to two of the most commonly confused fasteners.
Customers often ask:
“Can I get a bolt, full thread?”
“Do you mean a setscrew?”
“No, a bolt… full thread.”
We understand the confusion – the terms sound similar, but in engineering, they refer to distinct types of fasteners. Knowing the difference helps ensure you order exactly what you need.
Let’s clear things up.
What is a Bolt?
A bolt is a type of threaded fastener, typically with a partially threaded shank. It’s designed to be used with a nut to securely clamp two or more components together.
Key features:
- Threaded only part of the way up the shank
- Usually used with a nut
- Designed to clamp multiple components together
- Often inserted through pre-drilled holes
What is a Setscrew?
A setscrew (also known as a fully threaded bolt or cap screw) has threads that run all the way up to the underside of the head. It’s typically used without a nut, and is often tightened directly into a tapped hole.
Key features:
- Fully threaded from tip to head
- Usually used without a nut
- Screws into a tapped hole
- Helps prevent movement between two components
Why the Confusion?
The difference between a bolt and a setscrew is subtle but important. Many people use the terms interchangeably, yet that small distinction – partially threaded vs fully threaded – can determine whether your assembly fits and functions correctly.
Need Help Identifying the Right Fastener?
If you’re unsure what you need, just ask. Our experienced team will help you identify the correct product, confirm thread type and grade, and make sure it meets your specification.
Contact Boka Bolt Supplies today on
01928 590 440 or by using the form below.