What Are Machine Screws Used For?
Quick answer: Machine screws fasten components through a matching tapped hole or nut. They are common in machinery, electronics, appliances, enclosures, automotive assemblies and other repeatable metal or plastic joints.
What matters most
- They use uniform machine threads rather than the tapered wood-screw form.
- They come in standardized inch and metric diameters, pitches, heads and drives.
- A washer, locking feature or specified torque may be required by the joint design.
How to choose or use it
Identify the mating thread first, then select length so sufficient threads engage without bottoming out or interfering behind the joint. Match material, strength grade and corrosion resistance to the environment.
Before buying, verify the screw diameter, length, thread, head style, drive, material and finish against the mating parts. A correct-looking screw can still be incompatible if its thread standard or corrosion performance is wrong.
Installation checklist
- Inspect the parts and confirm the required hole or mating thread.
- Use a correctly fitting driver and keep it aligned with the screw axis.
- Tighten only until the joint seats or to the specified torque; overtightening can strip threads or damage the workpiece.
- For structural, overhead or safety-critical joints, follow the approved drawing, code or fastener manufacturer’s data.