Knipex 48 41 J21 Internal Retaining Ring Pliers

Product Description

The KNIPEX 48 41 J21 is a precision circlip plier designed for installing and removing internal retaining rings in bores and housings. Built to DIN 5256 D standards, this tool features 90-degree inserted tips and handles a ring diameter range of 3/4 inch to 2-3/64 inch. The steel body is engineered for heavy-duty shop use, with a zero backlash operation and an overstretching limiter that prevents ring or tip damage during use. Overall length is 165.00 mm (approximately 6.5 inches), and the tool weighs 0.395 pounds. Mechanical technicians, maintenance professionals, and assembly technicians working with circlip fasteners will find this plier well-suited for precise, controlled ring placement.

The 48 41 J21 is used in applications where internal circlips must be seated into grooves inside bores, cylinders, housings, or bearing pockets. The 90-degree tip angle allows access in tight or recessed installations where straight-tip pliers cannot reach effectively. Typical install scenarios include drivetrain assemblies, hydraulic cylinder rebuilds, pump housings, and general mechanical maintenance. The adjustable stop screw helps the technician set a consistent tip spread, reducing the risk of overexpansion and improving repeatability across multiple rings of the same size.

Key Features

• 90-degree inserted tips for accessing internal circlip grooves in recessed bores
• Overstretching limiter with overexpansion guard prevents ring and tip damage
• Zero backlash operation provides precise tip control during ring placement
• Adjustable stop screw allows repeatable tip spread setting for consistent work
• Bolted joint construction for rigid, play-free tip alignment
• Meets DIN 5256 D standards for circlip plier performance

Compatibility

Designed for internal retaining rings with a diameter range of 0.750 inch to 2.047 inch (3/4 inch to 2-3/64 inch). Suitable for use wherever DIN-style internal circlips are specified in bore or housing applications.

Installation Notes

Installation and removal of internal circlips should be performed by a qualified mechanic or maintenance technician familiar with circlip fastener systems. Always relieve system pressure and de-energize any associated equipment before disassembling housings or bearing pockets. Use the adjustable stop screw to pre-set tip spread before ring engagement to avoid overexpansion. Eye protection is strongly recommended, as circlips can release stored energy suddenly during installation or removal.