Knipex 44 21 J31 SBA Retaining Ring Plier Internal .090 Tip 90 Deg

Specialised internal retaining-ring pliers

Knipex 44 21 J31 SBA pliers are built for technicians who remove or install internal circlips in tight bores. The 90-degree angled jaws and .090-inch tips reach into confined spaces where straight pliers cannot operate. Chrome vanadium electric steel provides the hardness and corrosion resistance required for repeated professional use.

Tip diameter limits minimum ring size

The .090-inch tips engage only internal retaining rings with matching or larger hole diameters; smaller rings will slip or deform. The 90-degree bend restricts access to bores with sufficient clearance for the angled head, so very shallow housings may prevent proper tip insertion. No spring-assisted opening is fitted, so grip strength determines operating speed.

Simple hand-tool setup with one common error

No adjustment or calibration is needed; the pliers work immediately out of the box. The most frequent mistake is selecting the wrong tip angle or diameter for the ring, which damages both the circlip and the bore. Users must verify the ring specifications match the .090-inch, 90-degree profile before starting the job.