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ROLL PIN · REMOVAL GUIDE
Removing a roll pin is almost never easier than installing one. A pin that's corroded, peened over, or driven into a blind hole can fight you, and the wrong approach bends the pin, bells the hole, or marks the part. Here's the clean way out.
Before you start
- Know your pin size. Match a punch to the pin's nominal diameter — a punch that's too small bends and skips, too large won't enter the bore. (Our size chart lists nominal diameters for every common roll pin.)
- Check the hole type. Through-hole (pin drives straight out the back) or blind (pin only exits the way it went in). This determines your whole approach.
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Support the part. Same rule as installation: solid, flat backing with a relief hole so the pin has somewhere to go.
Stuck or corroded? Use a penetrating oil — not grease. Penetrating oil wicks into the pin-to-bore interface and breaks a corroded bond; let it sit and reapply before driving. Grease sits on the surface, does nothing to free the pin, and can trap pressure in a blind hole. And once the pin's out: install the new one dry — a roll pin grips by spring tension, and oiling the bore reduces its hold.
Removing a through-hole roll pin
- Pick a roll pin punch matched to the pin diameter. A roll pin punch has a small nub at the tip that centers in the pin's hollow core — it won't skate off like a flat drift.
- Support the part over a bench block with a clearance hole aligned to the bore.
- Drive from the correct side. If the pin was installed from one face, drive it back out the way it came when you can.
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Steady, on-axis strokes. Let the pin move a little at a time. If it stops moving, stop hitting it and find out why before you mushroom it.
Removing a blind or stubborn pin
- Blind holes can't be driven through. Options: thread/grip the exposed end and pull, or (last resort) drill it out on size — slow, centered, and only if you're prepared to re-bore.
- Corroded pins: penetrating oil, time, gentle persuasion. Heat is a last resort and risks the part's finish or temper.
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Peened/mushroomed ends: dress the splayed edge flat with a file or stone before driving, or you're trying to force a flared pin back through a round hole.