18" Locking C-Clamp Pliers

The Palmgren 18" Locking C-Clamp is designed to deliver repeatable holding power across demanding fabrication, welding, and woodworking operations. The heavy-duty forged steel frame maintains rigidity under load while the adjustable locking mechanism provides controlled clamping pressure across a wide range of material thicknesses.

When your project demands a firm, reliable grip on large workpieces, the Palmgren 71800 18" Locking C-Clamp delivers the holding power and versatility professionals need. Built for welding shops, fabrication facilities, and metalworking operations, this clamp combines an 18-inch jaw capacity with a hardened steel body to handle the toughest clamping tasks with confidence.

Designed for professional shop environments, this locking C-clamp provides secure positioning during welding, grinding, cutting, and assembly work. The large jaw capacity supports oversized workpieces while maintaining stable clamping performance throughout extended operation.

The forged steel body is engineered for long service life under repeated shop use. Heat-treated components improve durability and resistance to deformation while maintaining consistent locking performance during high-pressure applications.

The adjustable lead screw mechanism with 1/4" hex key drive allows operators to fine-tune clamping force based on material thickness and application requirements. This controlled adjustment helps maintain workpiece stability while reducing movement during fabrication processes.

18-Inch Jaw Opening Capacity
The generous 18-inch opening handles large panels, thick stock, and oversized workpieces that smaller clamps simply cannot reach. Whether you're clamping steel beams, large assemblies, or thick plate, the 71800 provides the reach you need.

Precision Locking Mechanism
The screw-type locking adjustment gives you exact control over clamping pressure. Set your pressure once and lock it in "” the clamp holds securely without drift or slippage during welding or grinding operations.

One-Hand Release Trigger
The built-in release trigger lets you open the clamp with a single hand, keeping your other hand free to manage the workpiece. This ergonomic feature dramatically improves workflow efficiency when repositioning parts.

Hardened Steel Construction
Manufactured from hardened steel, the 71800 resists deformation under heavy clamping loads and holds up to the heat, sparks, and mechanical stress of active shop environments.

• Welding and tack welding large assemblies
• Metal fabrication and structural assembly
• Woodworking projects requiring wide jaw reach
• Holding fixtures during drilling, grinding, or cutting
• General industrial clamping tasks
• Heavy-duty repair and maintenance work
• Securing irregular workpieces during machining

Q: What's the difference between an 18" clamp and a 6" clamp?
A: The 18" clamp reaches much larger workpieces (up to 18" opening) compared to 6" (up to 6" opening). Choose based on the size of parts you typically clamp.

Q: Can I use the 18" C-clamp for welding?
A: Yes. C-clamps are commonly used for fixture work and temporary clamping during welding. The drop-forged jaws withstand heat exposure.

Q: How do I adjust pressure on the 18" clamp?
A: Insert the provided hex key into the lead screw and turn to adjust both jaw opening and clamping pressure. The locking nut can hold your setting.

Q: What materials can this clamp hold?
A: Wood, metal, plastics, and composites. The hardened teeth provide grip on most surfaces. Use protective pads for finished or painted surfaces.

Q: Is the clamp suitable for bench use or jobsite work?
A: It's ideal for both. The large size makes it a shop staple, but it's portable enough for jobsite clamping and fixture work.