Extra large five-sided cutting broaches covering 7mm to 10.5mm — the range most standard sets stop well short of.
⭐ At a glance
📏 Four sizes: 7.0mm, 8.0mm, 9.25mm, 10.5mm, each 150mm long
✅ Suited to winding arbor bushing work on grandfather/longcase, wall and bracket clocks
📦 Set of 4 broaches
✔️ Brand new, unused
🔧 What it does & how to use
A cutting broach is a tapered, five-sided reamer used to enlarge or true up a round hole in metal — here sized specifically for the larger holes found in bigger clock movements, rather than the fine pivot work most standard broach sets are aimed at. Each of the five ground edges shaves a fine, even layer of material with every turn, letting you creep up to an exact fit rather than jumping straight to a larger size. Useful for clockmakers, horologists and restorers working on winding arbor bushings, mainspring barrel holes, and oversized pivot holes on longcase, wall and bracket clock movements.
- Select the broach: choose the size just larger than the current hole diameter.
- Insert and turn: push the tapered tip into the hole and rotate, applying light, even pressure.
- Check fit often: withdraw and test-fit the arbor or bushing regularly rather than over-cutting in one go.
- Step up gradually: move to the next size only if more material needs removing, working towards a clean friction fit for the new bushing.
- Clean up: clear away swarf from the hole before fitting the replacement bushing or arbor.
⚠️ Please check this set only covers 7mm–10.5mm — it's designed to complement a standard broach set for the larger holes it can't reach, not to replace one for everyday pivot-hole work below 7mm.
