G Clamps
G clamps give you a solid third hand for holding timber, steel, and sheet tight while you drill, glue, weld, or cut without it creeping.
When you're trying to keep a workpiece dead still, a decent G clamp stops slips, ruined cuts, and pinched fingers. They're the go-to for bench work, site fixes, and quick jigs. Pick the throat depth and opening to suit the job, then clamp square and don't overdo the screw.
What Jobs Are G Clamps Best At?
- Holding timber for drilling and fixing Clamps keep stud, batten, or ply tight to a bench or trestle so the bit doesn't snatch and the hole lands where you marked it.
- Gluing and laminating Pulls joints together on trims, carcasses, and repairs while adhesive cures, so you are not relying on one hand and a prayer to keep it aligned.
- Welding and metal fab set-up Pins angle, box, and plate in position for tacks and cuts, especially when you need repeatable pressure without the work shifting as it heats.
- Site repairs and temporary jigs Holds a straightedge, packer, or guide in place for quick trimming and routing when you cannot be bothered building a full jig for a one-off.
- Bench work and vice alternatives Gives you quick, local clamping where a vice will not reach, like the edge of a door, a wide panel, or awkward shaped bits.
Choosing the Right G Clamps
Match the clamp to the opening and reach you actually need, because a small clamp that fits beats a big one you cannot position.
1. Opening capacity (how wide it will clamp)
If you are clamping thin sheet, trims, or small blocks, a smaller opening is quicker and easier to handle. If you are pulling together thicker timber, boxed steel, or stacked materials, go up a size so you are not fighting the last few threads.
2. Throat depth (how far it reaches in)
If you only ever clamp on edges, shallow throat is fine and usually stiffer. If you need to clamp further into a panel or away from the edge, you need more throat depth or you will never get the pad where the pressure needs to be.
3. Frame and screw feel (stiffness and control)
If you are doing glue-ups or anything that needs even pressure, pick a clamp that winds smoothly and does not flex under load. If the frame twists or the screw feels gritty, you will spend your time re-aligning instead of getting the job done.
Who Uses G Clamps on Site?
Chippies and joiners use G clamps for glue-ups, trimming, and holding guides when fitting out. Fabricators and welders rely on them for set-up and tacking when you need the job to stay put. Maintenance teams keep a couple in the van for quick repairs where you need hands-free holding while you drill, cut, or bond.
G Clamp Accessories That Save Your Work
A couple of simple add-ons stop damaged faces and slipping clamps, especially on finished joinery and painted metal.
1. Clamp pads and soft jaw protectors
These stop the clamp foot bruising timber, denting aluminium, or marking finished edges, so you are not filling and touching up after what should have been a quick hold.
2. Bench dogs and clamping blocks
Use them to spread pressure, keep things square, and stop the workpiece riding up as you tighten, which is the usual reason a joint opens up mid glue-up.
Shop G Clamps at ITS
Whether you need a small G clamp for bench work or bigger sizes for thicker stock, we stock a proper range of g clamps UK trades actually use. It is all held in our own warehouse, in stock and ready for next day delivery so you can get clamped up and cracking on.
G Clamps FAQs
Are G-clamps and C-clamps the same?
In day to day trade use, yes, they are the same style of clamp and most people mean the same thing. You will see both names used for the classic G shaped frame with a screw that tightens onto a pad.
How long do G-clamps last?
A decent G clamp will last years of site and workshop use if you do not abuse the screw or bend the frame. Keep the thread clean, give it a light oil now and then, and do not use a cheater bar to over-tighten because that is what strips threads and twists frames.
What size G clamp should I buy first?
Buy to the opening you actually clamp most often, not the biggest you can find. For general bench and site fixing, a couple of mid sizes cover most jobs, then add deeper throat or larger opening clamps when you start clamping panels or thicker assemblies.
Will a G clamp mark timber or painted metal?
It can do, especially on softwood, MDF edges, and anything already painted or powder coated. Use a bit of scrap timber as a packer or fit soft pads so the clamp foot does not leave a witness mark.
Why does my workpiece creep as I tighten the clamp?
It is usually uneven pressure or a slippery contact point. Square the clamp up, use a packer to level the faces, and tighten in stages while you hold the work where it needs to sit, rather than cranking it down in one go.
