Axle Vise

Holding a hub axle in a bench vise during cone-and-locknut work is the kind of step that goes one of two ways. Done right, the axle stays put while two cone wrenches torque the locknut against the cone. Done with a standard bench vise's flat steel jaws, the axle's threads get crushed against the jaw faces, and the axle won't accept the cone or locknut on the next reassembly. The 1639/2 is the axle-side adapter that converts a standard bench vise into an axle clamp without damaging the threads it's holding.

How it works

The 1639/2 is a hardened-steel pair of half-blocks with a matching parallel channel cut between them at the working face. The two halves of the vise drop into a standard bench vise; the axle drops into the channel between them; closing the bench vise pinches the two halves together against the axle's circumference. The axle is held by the full surface of the parallel channel, not by the flat faces of the bench vise jaws.

Two features matter for daily-use shop service:

1. Spring-loaded opening. The two halves separate automatically when the bench vise loosens. No fiddling to retrieve the lower half from the vise after a service, no dropping the lower half on the floor mid-job.
2. Guide pins. The two halves are kept parallel by pins running through guide holes. Without the pins, the halves can rotate out of plane and grip the axle along a line rather than across a surface; with the pins, the grip stays true and the axle stays still.

Spec

• Material: hardened steel
• Axle sizes: 9 mm and 10 mm
• Mechanism: spring-loaded; guide-pin alignment between halves

Compatibility

The 1639/2 holds 9 mm and 10 mm quick-release hub axles. That covers:

• 9 mm front-hub QR axles (the universal road and MTB front-hub standard for QR-equipped bikes)
• 10 mm rear-hub QR axles (the universal road and MTB rear-hub standard for QR-equipped bikes)

For thru-axle hubs (12, 15, or 20 mm), the axle itself is usually serviced in the hub rather than removed; cap removal goes to the Hub Genie 1758/4 rather than to an axle vise. The 1639/2 is the right tool for QR hubs that still ship on most road, gravel, and city bikes; thru-axle hubs use a different workflow.

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 1639/2 sits in a category of small Unior bench tools that look simple but earn their bench space through the work they don't do: they don't damage the axle threads, they don't drift out of alignment during the service, and they don't need to be put back together every time. The spring-loaded opening saves seconds on every job, which adds up across a shop's service week.

Pro tip from our mechanics

The axle vise grips on the smooth section of the axle between the cones, not on the threaded ends. Position the axle so the channel grips the smooth section; the cones and locknuts stay outside the channel, where the wrenches need access. Gripping on the threaded section is what damages threads; gripping on the smooth section is the design intent. The full hub-service workflow lives at Bearing and headset service: a workshop guide →