Plain metric hex nuts in 304 stainless steel, sold individually in M2, M3, M4 and M5. They are made to DIN 934, so every dimension is the standard one and they take an ordinary metric spanner or socket alongside any matching coarse thread screw or threaded rod. Stainless means they can go outdoors or anywhere damp without rusting, which the usual zinc plated hardware store nut cannot.
Size chart
| Size | Thread pitch | Across flats | Across corners | Thickness |
|---|---|---|---|---|
| M2 | 0.4 mm | 4.0 mm | 4.32 mm | 1.6 mm |
| M3 | 0.5 mm | 5.5 mm | 6.01 mm | 2.4 mm |
| M4 | 0.7 mm | 7.0 mm | 7.66 mm | 3.2 mm |
| M5 | 0.8 mm | 8.0 mm | 8.79 mm | 4.0 mm |
Specifications
What's in the box
Price is per nut. Order the quantity you need and they arrive loose in a labelled bag, posted next business day.
Great for
Choosing the right size
- Match the number to the screw
An M3 screw takes an M3 nut. The number is the thread diameter in millimetres, not the spanner size, so an M3 nut measures 5.5 mm across its flats.
- Check the spanner you have
M2 needs a 4 mm, M3 a 5.5 mm, M4 a 7 mm and M5 an 8 mm spanner or socket. A small adjustable or a set of nut drivers covers all four.
- Allow for the thickness
The nut adds 1.6 mm to 4.0 mm to the back of your panel depending on size. Leave that much clearance, plus a thread or two of screw poking through.
- Use two for a locknut
On anything that vibrates, run a second nut down against the first and tighten them against each other. That jams the threads and stops the joint backing off.
Note: Stainless threads can gall, which is when the nut seizes solid partway down a stainless screw and will not move either way. Run the nut on by hand first, tighten slowly, and on anything you plan to take apart again put a smear of grease or anti-seize on the thread.