How to Choose the Right Sealey Setscrew
Get the diameter, thread form, length and strength grade right before worrying about finish or pack size. This guide explains the dimensions that actually determine whether a setscrew is suitable.
Thread + length + grade
A setscrew is only interchangeable when the essential dimensions and mechanical specification match the application.
Identify the thread
Confirm diameter, pitch and thread system before ordering.
Measure the length
Use the stated fastener measurement convention, not overall visual size alone.
Check the grade
Strength grade matters on structural, automotive and loaded joints.
Check the finish
Choose a finish appropriate to the working environment and corrosion exposure.
What should you check before ordering?
Use the selection points below to narrow the range before comparing individual products.
Setscrew versus bolt
A fully threaded setscrew is commonly used where the thread is required along most or all of the shank. Always replace a critical fastener with the correct specification.
- Do not substitute solely because the diameter looks right.
- Match the original thread pitch.
- Check whether the application requires a particular head style or standard.
Strength grades
Fastener grade affects tensile and yield strength. Automotive, lifting and structural applications can depend on the specified grade.
- Use the equipment manufacturer specification where available.
- Do not replace a higher-grade fastener with a lower grade.
- Avoid guessing where a joint is safety critical.
Length and engagement
Correct length provides sufficient thread engagement without bottoming out or interfering with adjacent components.
- Measure the original fastener where possible.
- Allow for washers and joint thickness.
- Check blind holes before fitting a longer replacement.
Browse Sealey Setscrews
Search by part number, size or a keyword from the product description.
Tip: a short part-number fragment often finds the right product faster than a long description.
Products 1–20
Products 21–40
Products 41–58
Quick answers before you choose
What does 8.8 mean on a metric setscrew?
It is a metric property class indicating the fastener strength specification. Replacement should match the requirement of the joint.
Can I replace UNF with metric?
No. Different thread systems are not interchangeable even when their diameters appear close.
How should setscrew length be measured?
For a standard hex-head setscrew, length is generally measured from beneath the head to the end of the thread.
Still not sure which one you need?
Send Tanair the existing part reference, equipment details and a clear photograph where useful. We can help you narrow the correct option before you order.