Nuts
Nuts are internally threaded fasteners used with bolts and studs, including hex nuts, nylock and all-metal lock nuts, flange nuts, wing nuts, dome nuts, weld nuts and heavy hex nuts. We supply standard and special nuts matched to bolt grade and thread.
What it is
Nut property class should match the bolt (for example class 8 nuts with 8.8 bolts). Locking nuts resist loosening under vibration using nylon inserts, deformed threads or serrated flanges.
Special nuts include weld nuts and cage nuts for sheet metal, heavy hex nuts for structural and pressure bolting, and slotted nuts with split pins.
Typical applications
- General bolted joints
- Vibration-prone assemblies (lock nuts)
- Structural and flange bolting
- Sheet metal fixing (weld and cage nuts)
- Adjustable fixings (wing nuts)
Materials & grades
- Carbon steel (4.6, 8.8, 10.9, 12.9)
- Stainless steel A2 (304) / A4 (316)
- Alloy steel (B7, high-tensile)
- Brass and non-ferrous
Points to consider
- Match nut class to bolt grade.
- Nylon-insert nuts are limited to about 120 °C; use all-metal lock nuts above.
- Use heavy hex nuts for structural and pressure applications.
- Note ISO vs DIN across-flat differences on some sizes (e.g. M10: 16 vs 17 mm).
Frequently asked questions
What grade nut should I use with an 8.8 bolt?
A class 8 nut (or higher) is matched to 8.8 bolts, so the thread strips in the bolt rather than the nut if overloaded.
How do lock nuts work?
They resist loosening using a nylon insert, deformed thread or serrated face that adds friction.
Why are M10 nut sizes different?
ISO 4032 M10 nuts are 16 mm across flats while older DIN 934 nuts are 17 mm; check which standard your tools match.