Lubrication Interval Calculator
Estimate interval and side-relubrication quantity for review against SKF, OEM, grease, and site data
Check bearing relubrication intervals with explicit source boundaries. SKF handbook guidance obtains relubrication interval from a diagram using speed factor, bearing factor, and C/P load ratio; this app uses a local closed-form approximation and estimated bearing dimensions for planning review only. It exposes the temperature, contamination, orientation, grease-family, and load factors it applies, then warns that the result is not a manufacturer-approved interval, CMMS instruction, warranty decision, automatic-lubricator setting, or substitute for OEM and qualified reliability review.
Select the right grease for your bearings
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Bearing Life Calculator →Read the bearing lubrication intervals guide
Bearing Lubrication Intervals Guide →How It Works
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Enter Bearing and Speed Inputs
Enter bore diameter, bearing type, shaft speed, operating temperature, contamination level, shaft orientation, grease family, and C/P load ratio. The app estimates outside diameter and width from bore, so replace those estimates with catalog D and B before using the quantity in a work instruction.
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Review Source Boundaries
Read the warnings before using the output. The interval is a local approximation to SKF/Schaeffler-style relubrication guidance, not a digitized SKF diagram or manufacturer-approved interval.
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Check the Planning Factors
Review the visible temperature, contamination, orientation, grease-family, and load multipliers. These are representative planning factors and do not replace product data sheets, condition monitoring, seal/housing review, or OEM instructions.
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Verify Before Scheduling
Use the interval and side-relubrication quantity as a screening result. Confirm actual bearing series, D/B dimensions, grease path, purge path, housing fill, grease compatibility, route practicality, and qualified reliability approval before updating CMMS or an automatic lubricator.
Built For
- Maintenance planners screening relubrication intervals before OEM and site-history review
- Reliability engineers checking whether a route needs closer condition-monitoring validation
- Millwrights estimating side-relubrication quantity before confirming catalog D/B dimensions
- Vibration analysts comparing a planning interval against observed temperature and condition trends
- Plant operators identifying high-frequency relubrication cases that need root-cause review
- CMMS administrators documenting assumptions before a qualified reviewer approves interval changes
- Training staff showing why grease path, purge path, and manufacturer data matter
Features & Capabilities
Bounded Saved State
Normalizes shared-link and autosaved values before applying them, so malformed bore, speed, temperature, load, bearing, contamination, orientation, or grease-family values cannot silently drive reports or exports.
Local Source-Gap Approximation
Shows a source warning that SKF obtains interval from a diagram using speed factor, bearing factor, and C/P load ratio. The app uses a local approximation that must be checked against current manufacturer data.
Grease Quantity Boundary
Displays side-relubrication replenishment quantity using Gp = 0.005 × D × B with estimated D and B, and notes that SKF lists Gp = 0.002 × D × B for relubrication through bearing-ring features.
Source Warning Export
Includes the source warnings, assumptions, residual source gaps, and source-ledger IDs in the report and PDF export so the review trail is visible outside the app.
Review Factors
Exposes temperature, contamination, shaft orientation, grease-family, and C/P load-ratio multipliers as planning assumptions rather than hidden final-design logic.
Comparison
| Review Area | What the App Screens | Still Required |
|---|---|---|
| Interval | Local approximation from bore, RPM, bearing type, temperature, contamination, orientation, grease family, and C/P ratio | SKF/Schaeffler/OEM diagram or software check with actual bearing and grease data |
| Quantity | Side-relubrication Gp = 0.005 D B using estimated outside diameter and width | Actual catalog D/B, grease path, purge path, relief fitting, and housing fill review |
| Grease | Representative grease-family multiplier | Product data sheet, base oil viscosity, thickener compatibility, NLGI grade, temperature range, and regulatory limits |
| Environment | Representative contamination and vertical-shaft multipliers | Seal condition, water/process ingress, washdown, vibration/shock, and condition-monitoring data |
| Schedule | Continuous-duty annual event estimate | Duty cycle, route logistics, CMMS approval, automatic-lubricator sizing, and qualified reliability review |
Assumptions
- Bore, RPM, temperature, bearing type, contamination, orientation, grease family, and C/P ratio are user-entered and not measured by the app.
- Outside diameter and width are estimated from bore and must be replaced by catalog values for maintenance records.
- The interval curve is a local approximation to published relubrication guidance and remains a source gap until checked against manufacturer diagrams or software.
- The displayed quantity uses SKF side-relubrication factor Gp = 0.005 D B; ring-feature relubrication can use Gp = 0.002 D B.
- Condition monitoring, grease compatibility, seal condition, purge path, housing fill, and OEM instructions remain outside the calculation.
Limitations
- Does not digitize SKF/Schaeffler relubrication diagrams or manufacturer bearing tables.
- Does not accept exact bearing series, outside diameter, width, cage, clearance, seal/shield, or product-specific grease data.
- Does not size automatic lubricators, interpret ultrasonic data, approve CMMS schedules, or verify warranty requirements.
- Does not cover oil lubrication systems, sealed-for-life bearings, miniature pre-lubricated bearings, or special environmental exposures.
- Does not substitute for OEM, grease supplier, lubrication technician, reliability engineer, or safety review.
References
- SKF Bearing Maintenance Handbook 10001 EN - relubrication interval diagram guidance and grease quantity factors.
- SKF Rolling Bearings 17000 EN - bearing speed, lubrication, and maintenance context.
- Schaeffler Rolling Bearing Lubrication WL 81 115/4 EA - relubrication and grease-life context.
- NLGI Grease Glossary - grease terminology and classification context.