Hex Head Cap Screws, Fully Threaded, Grade C are used primarily for a fully threaded hex head screw in product grade C for general construction and non-precision work. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to ISO 4018. Stocked across roughly M5 to M64, they cover general to heavy-duty work.
Typical Applications for Hex Head Cap Screws, Fully Threaded, Grade C
The most common settings where these are specified:
- Steel construction: secondary steelwork and brackets.
- Timber engineering: bolted timber connections.
- Agricultural equipment: rugged general fixings.
- Scaffolding and falsework: temporary works.
How to Specify Hex Head Cap Screws, Fully Threaded, Grade C for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M5–M64; 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 4018. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Tighten to the torque for the size and property class with a calibrated wrench — the joint is held by preload, not by the thread friction alone.
- Ensure at least one full thread projects beyond the nut after tightening, and never re-use a bolt that has been tightened into yield.
- Under slotted or oversized holes, fit a hardened washer so the preload does not relax into the hole edge.
Common Selection Mistakes with Hex Head Cap Screws, Fully Threaded, Grade C
- Specifying class 12.9 "to be safe" in a corrosive environment — high classes are more sensitive to hydrogen embrittlement and stress corrosion; 8.8 hot-dip galvanized often outlasts them outdoors.
- Choosing a length that puts the shear plane through the threaded portion when a plain shank (partially threaded bolt) was available.
- Mixing stainless bolts with plated-steel nuts: the joint loses its corrosion logic and can gall or seize.
Where Hex Head Cap Screws, Fully Threaded, 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.
Custom manufacturing · Made to drawing
Need a hex head cap screws, fully threaded, grade c outside the standard range?
Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
