Hex Bolts, Grade C are used primarily for structural and machine joints that must be tightened to a controlled preload. 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 4016. Stocked across roughly M5 to M48, they cover general to heavy-duty work.
Typical Applications for Hex Bolts, Grade C
The most common settings where these are specified:
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Structural steel: bolting beams, base plates and bracing where a defined preload and property class are required.
- Automotive & transport: chassis, suspension and powertrain mounting points subject to vibration.
- Heavy machinery: securing gearboxes, frames and guarding on plant that sees shock loads.
- Energy & infrastructure: tower, pylon and pipework supports exposed to weather and long service life.
How to Specify Hex Bolts, 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.
- Strength class: Choose the property class (e.g. 8.8, 10.9, 12.9 or A2/A4 stainless) for the load and environment, and tighten to the matching torque so the joint relies on preload, not friction.
- 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 4016. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Hex Bolts, Grade C Are Not the Right Choice
Not for permanent joints that will never be opened (a rivet or weld is cheaper), and not where the head must sit flush — use a countersunk screw instead.