Irwin 40EXT 18″ Vise-Grip Locking Chain Clamp Extension Chain

The IRWIN 40EXT is an 18″ replacement/extension chain built for the 20R VISE-GRIP locking chain clamp. If your original chain is worn, lost, or too short for larger workpieces, this OEM chain brings your clamp back to full function and expands its reach. Installed with the included screws, the 40EXT restores secure wrap-around clamping on irregular shapes—pipe, mufflers, odd fixtures, and non-parallel parts—where standard jaw pliers struggle. The chain links seat cleanly in the 20R’s drive mechanism, so closing pressure is even and predictable, and the locking action holds without slipping while you cut, grind, weld, or fixture parts.

Made for shop and field use, the 18″ length gives extra wrap for bigger diameters or to catch an anchor point on asymmetrical pieces. If you maintain welding stations, exhaust work, or fabrication jigs, having a fresh chain on a 20R clamp keeps setup fast and repeatable. This simple swap keeps a proven tool in service and avoids replacing the entire clamp.

Irwin 18″ Vise-Grip Locking Chain Clamp Extension Chain At a Glance

• Built for 20R clamps: Direct fit for IRWIN VISE-GRIP 20R locking chain clamps.
• 18″ chain length: Adds reach for larger pipes, housings, and irregular parts.
• Even, secure wrap: Chain engages the 20R drive for steady locking pressure.
• Refresh or repair: Replaces worn or damaged chains to extend tool life.
• Fast install: Includes screws to mount on the existing clamp body.
• Shop & field ready: Reliable hold for cutting, grinding, welding, and fixturing.
• Compact spare: Easy to store in a tool bag or service kit.

Markets

• Welding & Fabrication Holds round and odd shapes during cut, grind, and tack operations.
• Automotive & Exhaust Wraps around mufflers, pipes, and brackets for repair and fit-up.
• Construction & MRO Clamps valves, handrails, and hardware for on-site work.
• Manufacturing Useful at assembly benches for fixtures and repeatable setups.
• Municipal & Facility Maintenance One clamp covers a wide range of diameters and shapes.
• Trade Schools Keeps shared 20R clamps serviceable for student use.

A locking chain clamp is only as good as its chain. Shops that rely on the 20R keep a 40EXT on hand to replace stretched or damaged links and to gain length for larger diameters. The 18″ chain lets the clamp wrap securely around pipes, housings, and non-parallel parts where C-clamps and jaw pliers can slip or leave uneven pressure. With new screws in the pack, installation is quick and the clamp returns to smooth, repeatable locking. For weld bays, exhaust work, and maintenance teams, this small part restores holding power, reduces setup time, and keeps a familiar tool working across more jobs.

Irwin 40EXT 18″ Vise-Grip Locking Chain Clamp Extension Chain Features

• Direct OEM Fit: Designed for IRWIN VISE-GRIP 20R locking chain clamps.
• 18-Inch Length: Accommodates larger diameters and awkward geometries.
• Durable Chain Links: Withstand torsion from the 20R’s locking mechanism.
• Included Hardware: Replacement screws for a secure installation.
• Consistent Clamping: Maintains uniform pressure around the workpiece.
• Service-Friendly: Simple field replacement extends tool service life.

Irwin 40EXT 18″ Vise-Grip Locking Chain Clamp Extension Chain Includes

• (1) 18″ Extension/Replacement Chain
• (5) Mounting Screws

Irwin 40EXT 18″ Vise-Grip Locking Chain Clamp Extension Chain Specifications

• Brand / Model: IRWIN 40EXT
• Type: Extension/replacement chain for locking chain clamp
• Compatible Tool: IRWIN VISE-GRIP 20R Locking Chain Clamp
• Overall Length: 18″
• UPC: 038548000404
• Product Dimensions (pack): 5.5″ x 2.25″ x 0.75″
• Product Weight (pack): 0.57 lb (258.55 g)
• Group: Vise/locking plier accessories

Irwin 40EXT 18″ Vise-Grip Locking Chain Clamp Extension Chain Warranty

• Irwin’s Full Lifetime Guarantee Against Manufacturing Defects

Why Customers Choose the Irwin 18″ Vise-Grip Locking Chain Clamp Extension Chain

Teams choose the IRWIN 40EXT to keep a trusted 20R locking chain clamp in rotation and ready for larger work. The 18-inch chain restores smooth engagement with the clamp’s drive wheel, so pressure is even around pipes and odd shapes, and the lock holds while you weld, grind, or fit parts. With the included screws, the swap is quick—no hunting for hardware—and the clamp returns to dependable service. It’s an inexpensive way to extend tool life, expand capacity, and maintain reliable holding power across fabrication, exhaust repair, and general maintenance tasks.