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Fixed Bore Sprockets
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Fixed bore roller chain sprockets, sometimes called finished bore, are designed to fit a specific shaft size and include a keyway and setscrew so they're ready to install. Fixed bore sprockets are attached directly to shaft and do not require a bushing. They are generally used in low power applications and have less clamping power than bushed bore sprockets. Unlike plain bore sprockets, they cannot be customized or machined to accommodate shaft variations or suit special application or size requirements.