Hex Nuts, Grade C are used primarily for the clamped counter-face of a bolted joint. This page summarizes where they fit, the industries that rely on them, and the practical points to get right when you specify them — to ISO 4034. Stocked across roughly M5 to M48, they cover general to heavy-duty work.
Typical Applications for Hex Nuts, Grade C
The most common settings where these are specified:
- Vibration-prone equipment: where a locking or flanged style resists loosening.
- Frames & weldments: captive or welded options for repeatable assembly.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
- Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
How to Specify Hex Nuts, Grade C for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M5–M48; check the full table below for the exact dimensions of each size.
- Locking & grade: Match the strength grade to the bolt, and choose a locking style (nyloc, all-metal, serrated flange) if the joint sees vibration.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to ISO 4034. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Hex Nuts, Grade C Are Not the Right Choice
Not on their own — they need a matching bolt or stud — and a plain nut is not a substitute for a locking type under heavy vibration.