How to find the right Bushings & Bushed Bearings AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Bushings & Bushed Bearings
- Bearing type vs job
- Plain sleeve or flanged bushings support a rotating or sliding shaft. QD and Taper-Lock bushings clamp a sprocket, sheave or pulley to a shaft and are not bearings. The category mixes two unrelated parts, so confirm which one you need before you start matching sizes.
- Material for the load and speed
- Choose by the PV (pressure × velocity) limit on the maker's datasheet. Oil-impregnated sintered bronze suits light-to-moderate continuous rotation. Solid or cast bronze suits heavy, slow, shock loads. PTFE-lined steel or polymer suits dry or oscillating service. Exceeding the PV limit is the main cause of fast wear and seizure in plain bearings.
- Exact dimensions and unit system
- Match the inner diameter, outer diameter and length, plus the flange diameter and thickness if it is flanged. Do not substitute inch parts for metric parts or the reverse. Near-miss sizes give either a loose shaft or a bushing that will not press in.
- Housing fit and shaft finish
- Follow the maker's recommended housing bore and shaft tolerances. Use a hardened, smooth shaft for polymer and PTFE-lined bushings. The interference fit and the shaft surface set both the running clearance and the wear rate.
Brands that matter
- Bunting Bearings: Wide range of inch sintered and cast bronze sleeve and flanged bushings.
- Oilite: The original oil-impregnated sintered bronze bushing brand; often used as a generic term.
- igus: iglidur self-lubricating polymer bushings in many metric and inch sizes.
- GGB: PTFE-lined metal-polymer bushings such as the DU type, for dry running.
- Boston Gear: Long-established supplier of bronze sleeve and flanged bearings.
- TB Wood's: Major maker of QD bushings and matching sheaves.
- Martin Sprocket & Gear: QD and Taper-Lock bushings to fit its sprockets and sheaves.
- Dodge: Originator of the Taper-Lock bushing system.
What to avoid
- Unbranded bronze bushings that give no material grade or dimensional tolerance
- Buying a QD bushing to replace a Taper-Lock bushing, or the reverse
- Guessing sizes from a worn part instead of measuring the housing bore and shaft
Questions
Is a QD bushing a bearing?
No. It is a split tapered clamp that locks a sprocket or sheave to the shaft, and it does not let the shaft rotate inside it.