Frame Taps M3

M3 threads are easy to ignore until one fails. On older horizontal-dropout frames, M3×0.5 holds the axle-positioning bolts that set the rear-wheel chainline. On a working frame, an M3 thread also shows up on cable guides, certain disc-brake adapter mounting holes, and the small hardware on internal-routing exit ports. A stripped M3 thread on any of these stops the job until the thread is restored.

The 1695 Frame Tap M3 chases an existing M3×0.5 thread; it doesn't cut a new one. The cutting edges follow the pitch and major-diameter of the existing thread and remove only the paint, corrosion, or distortion that's blocking it. The result is a thread that takes a fresh bolt cleanly without losing the thread's geometry.

When to chase an M3 thread

• After paint overspray at the factory has filled the thread
• After crash damage has bent or distorted the thread profile
• After corrosion or seized-bolt residue has built up in the thread
• Before installing new hardware in a frame that's been in storage

If the thread is genuinely stripped (the bolt has cut new threads into the surrounding metal), chasing won't fix it. The fix there is a thread insert or a Helicoil; different repair, different tool.

Use with the magnetic handle

The 1695 Frame Tap pairs with our magnetic Handle for Pedal Taps 1695/4BI for the leverage to cut cleanly without cross-threading. The magnetic-collet engagement holds the tap square to the work; a standard tap handle works too but the magnetic version stays put under hand-pressure on small-pitch threads.

Specs

• M3×0.5 chase tap
• Hardened tool-steel cutting edges
• Square-shank engagement, compatible with 1695/4BI Handle for Pedal Taps
• Article number: 1695 (M3 size)

For the M5×0.8 size, see our M5 frame tap. For the BSA bottom-bracket shell, see the BSA tap set.

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. Thread taps are a general-machinist tool that Unior makes for the broader hand-tool catalog and adapts to bike-specific thread sizes for the cycling line. Same hardened tool-steel and same heat-treatment as the rest of the tap family.

Pro tip from our mechanics

The right time to chase a frame thread is the moment a new bolt feels gritty going in, not after it strips. Two minutes with the right-pitch tap before bolting in fresh hardware is the cheapest insurance against a stripped thread an hour later. Our workshop hand tools guide covers thread-chase and other workshop work that quietly saves cranks, frames, and customer trust: Workshop hand tools every bike shop needs →