Slip-joint pliers Knipex Cobra 300 mm — max pipe Ø 70 mm, max nut 60 mm

The Knipex Cobra 300 mm slip-joint pliers are designed for reliable gripping of pipes, tubes and hexagonal nuts. With a 300 mm overall length and a specially shaped jaw geometry, these pliers permit secure clamping of workpieces up to 70 mm in pipe diameter and nuts up to 60 mm across flats. The tool features a robust steel construction, an adjustable slip-joint mechanism and a quick-adjust push-button that allows fast repositioning without time-consuming presetting. Weighing approximately 530 g, the pliers combine strength and control for plumbing, installation and general maintenance tasks.

Advantages

The Cobra quick-adjust system enables rapid, one-handed adjustment to the required jaw width, so you can move between different pipe or nut sizes efficiently. Hardened gripping surfaces and precise jaw geometry provide a secure hold with minimal slippage on round and hexagonal profiles. The slip-joint design gives a stable, repeatable setting and the robust steel construction ensures durability under frequent professional use. The 300 mm length balances reach and leverage for a wide range of tasks while maintaining maneuverability in confined spaces.

Suitable for

• Gripping and turning pipes and fittings in plumbing and heating work
• Holding and tightening hex nuts and bolts up to 60 mm
• General installation and maintenance where variable jaw opening is required
• Work in confined spaces where a 300 mm tool provides reach with control

Key specifications

• Overall length: 300 mm
• Maximum pipe/tube diameter: 70 mm
• Maximum nut size: 60 mm (across flats)
• Weight: approximately 530 g
• Adjustable slip-joint with quick-adjust push-button
• Hardened gripping surfaces and precision-formed jaws
• Material: high-strength steel construction

How to use

Position the upper jaw on the workpiece and press the push-button to release the quick-adjust mechanism. Slide the lower jaw until the pliers sit securely on the pipe or nut, then release the button to lock the setting. Apply steady turning force using the handles while keeping the jaws aligned with the workpiece. For repeated sizes, the slip-joint provides a reproducible setting; for larger diameters use the widest jaw position. After use, wipe the tool clean and store it in a dry place to maintain performance.

Usage recommendations

Use the Knipex Cobra 300 mm pliers for metal and plastic pipes, fittings and hexagonal fasteners within the specified size limits. Avoid using the tool on live electrical conductors and do not use the pliers as a hammer. Regularly inspect the jaws for wear and keep the quick-adjust mechanism free of heavy contamination to ensure reliable operation.