Heavy-Duty 12-Inch F-Clamps, 4-Pack, 1320 Lbs Forged Alloy Steel

The GleamRad Heavy-Duty 12-Inch F-Clamps are built for metalworkers, welders, and fabricators who need dependable holding force during cutting, grinding, and welding tasks. Made from drop-forged alloy steel rather than stamped sheet metal, this four-pack of clamps is designed to keep workpieces firmly anchored under substantial fabrication pressure.

Each clamp delivers up to 1,320 lbs (600 kg) of clamping capacity. With a 4-3/4-inch (120 mm) throat depth, the jaws reach well past outer edges to secure broad plates or assemble box tubing closer to the center of your work. The 12-inch (300 mm) opening provides ample clearance for thick stock, structural tubing, or layered materials.

Operation centers on a smooth-turning threaded spindle coated in a black-oxide finish that resists rust and shop corrosion from heat and spatter. The sliding arm moves along the steel rail for rapid positioning, and an integrated steel end-stop prevents the arm from accidentally sliding off the bar. At the contact point, a tilting swivel pad automatically adjusts against angled or round surfaces to distribute pressure evenly.

Keep in mind that these clamps are capped at a 12-inch capacity, so projects requiring wider spans will need larger equipment. Additionally, the heavy-gauge forged alloy construction adds noticeable weight when setting up multiple clamps on a single assembly.

Verdict: The GleamRad 12-Inch F-Clamp 4-pack provides high-strength clamping and generous throat depth for metal fabrication and welding setups. It is an excellent choice for anyone needing strong, reliable holding power across structural stock and angled materials.

• Clamping Capacity: 1,320 lbs (600 kg)
• Opening Capacity: 12 inches (300 mm)
• Throat Depth: 4-3/4 inches (120 mm)
• Material: Drop-forged alloy steel bar and jaws
• Spindle Finish: Black oxide
• Package Quantity: 4 clamps

A great fit if you:

• Need up to 1,320 pounds of holding force for welding, cutting, or grinding.
• Work with thick plates, box tubing, or stacked stock under 12 inches thick.
• Require a deep 4-3/4-inch reach to clamp further inward from workpiece edges.
• Work with round or angled materials that require a pivoting swivel pad.

Consider something else if you:

• Need a clamp opening wider than 12 inches for oversized assemblies.
• Prefer lightweight clamps for small, delicate projects.

What is the maximum holding capacity of each clamp?
Each clamp is rated for a maximum clamping capacity of 1,320 lbs (600 kg).

What are the opening and throat dimensions?
The clamps feature a 12-inch (300 mm) maximum opening capacity and a 4-3/4-inch (120 mm) throat depth.

Can these clamps securely hold round or angled materials?
Yes, the clamp includes a tilting swivel pad designed to sit flat against angled or round stock to spread pressure evenly.

How is the spindle protected against shop rust and corrosion?
The threaded spindle is treated with a black-oxide finish to resist rust and corrosion in hot, spatter-heavy work environments.