Knipex 4421J01 Internal Retaining Ring Pliers Bent Nose

Product Description

The KNIPEX 4421J01 is a bent-nose internal retaining ring pliers designed for installing and removing internal snap rings in bores and housings. Built to DIN 5256 D standards, the tool features a 90-degree tip angle and a 0.90 mm tip diameter, making it well-suited for precision work in confined spaces. The forged steel body is oil-hardened for durability, and the plastic handles provide a non-slip grip during use. At 5 inches overall length, this is a compact tool sized for close-tolerance applications. Technicians in HVAC, plumbing, automotive, and general mechanical service rely on this style of pliers for circlip work across a wide range of assemblies.

The 4421J01 is intended for internal retaining rings with a diameter range of 5/16 to 1/2 inch. The bent-nose configuration provides access to rings seated in shallow or angled bores where a straight-nose tool cannot reach cleanly. This tool is used in residential and commercial service environments wherever internal circlips secure bearings, shafts, or components inside bored housings. The solid forged construction handles the side-loading stress typical of snap ring installation and removal without flexing.

Key Features

• Bent nose at 90 degrees for access to angled or recessed bores
• Ring diameter range: 5/16 to 1/2 inch
• 0.90 mm tip diameter with a 0.0350 inch tip size for precision fit
• Oil-hardened, forged steel body for long service life
• Non-slip plastic handles for secure grip
• Meets DIN 5256 D standard

Compatibility

Designed for use with internal retaining rings in the 5/16 to 1/2 inch diameter range. Suitable for standard bore applications where a bent-nose internal ring pliers is specified.

Installation Notes

Internal retaining ring pliers should be used by a qualified mechanic or service technician familiar with snap ring installation procedures. Always depressurize, de-energize, or otherwise make safe the assembly before servicing any component retained by a circlip. Wear appropriate eye protection, as retaining rings can release under load. Ensure the correct tip size is engaged fully in the ring holes before expanding the ring to avoid tip slippage.