Try a manufacturer, product type, bearing reference, calculator or technical topic.
Practical calculators and identification tools for industrial maintenance, replacement parts and power transmission.
Start with a bearing number, three dimensions, application details or photograph notes. The Bearing Finder creates a structured identification brief for Bridge Engineering to verify and quote.
Answer practical questions about the operation, workpiece material, size, machine and production requirements. The Cutting Tool Finder creates a recommendation and quote-ready technical brief.
Enter both pulley pitch diameters and either centre distance or belt pitch length.
Uses the standard approximate open-belt pitch-length equation. Results are a selection guide only; the nearest commercially available belt may require centre-distance adjustment. Confirm the belt section, allowable speed, wrap angle and manufacturer recommendations before ordering.
Calculate driven speed, speed ratio and approximate belt speed.
Assumes no belt slip and uses pulley pitch diameters. Actual driven speed can vary with belt type, loading, wear and installation tension.
Calculate nominal pitch length and nearest whole tooth count.
Uses pulley pitch diameters derived from tooth count and pitch. Confirm available belt tooth counts, minimum pulley teeth, tooth profile and allowable centre-distance adjustment.
Estimate chain length in pitches and the nearest even number of pitches.
Provides an approximate two-sprocket chain length. Final selection should use an even number of pitches where possible and allow for tensioning, wear adjustment and manufacturer recommendations.
Initial grease quantity guide using G = 0.005 × D × B.
This is a general initial-fill guide. Relubrication quantity and interval depend on bearing type, speed, temperature, contamination, housing free space and grease supplier guidance.
Indicative parallel key size by shaft diameter.
Indicative standard parallel-key dimensions only. Confirm key material, hub and shaft keyway depths, tolerances, torque and applicable standard before manufacture.
Important: These calculators are initial selection aids. Confirm final dimensions, ratings and application suitability against the relevant manufacturer’s technical information.
The O-ring calculator now sits within our dedicated Oil Seals, O-Rings & V-Rings product page, alongside oil-seal measurement guidance and a VA-versus-VS V-ring profile diagram.