Choose an internal puller collet by the bearing bore, not the outside diameter. The correct collet expands inside the bore with enough contact depth to grip securely, while remaining within its specified expansion range and compatible with the puller bridge or slide hammer.
Clean the bore and measure its inside diameter with a suitable gauge or caliper. Compare that measurement with the collet's working range, not simply the nominal size printed on the case.
A collet needs room to expand and lock against the bore. Selecting one at the extreme end of its range can reduce contact and increase the chance of slipping under load.
The collet must reach far enough into the bearing or race to expand behind a sound internal surface. Shallow engagement can pull on a chamfer or damaged edge instead of the intended bore wall.
Confirm the thread, adapter, bridge, or slide-hammer connection before beginning. A correctly sized collet still needs a compatible extraction tool that keeps force centered.
Rust, burrs, or a broken race can prevent even contact. Clean loose debris and reassess the tool choice if the bore is damaged enough that the collet cannot expand uniformly.
A bridge and forcing screw can keep the pull more axial than a slide hammer. This is useful when the housing edge is delicate or the bearing is seated deeply in a blind bore.
Apply light tension first, then verify that the collet remains seated and the puller is aligned. If it shifts, release force and choose a better size or a different removal method.
Workshops servicing varied bore sizes benefit from a complete, labeled collet set. DNT Tools can help align a collet range with the common bearing bores and extractor connections in your work.
Stop if the tool starts to tilt, the grip moves off the intended bearing surface, the forcing screw binds, or the required force is uncertain. A DNT Tools support discussion can help match the puller, separator, collet, and adapters to the job.
Ask DNT Tools about a compatible setup
