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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Vibration Severity Checker →Estimate remaining bearing L10 life
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.
Frequently Asked Questions
Learn More
Lubricant Viscosity Grade Boundaries
How ISO VG, AGMA, SAE engine, SAE gear, and NLGI labels relate, with product data sheet, OEM, compatibility, and source-gap warnings.
Bearing Lubrication Intervals: SKF Source Boundaries & Grease Selection
How SKF relubrication guidance uses speed factor, bearing factor, load ratio, temperature, contamination, grease quantity factors, and OEM review.
Reviewing PM Intervals With Weibull and Source Gaps
How to use Weibull reliability analysis and cost modeling to find the PM interval that minimizes total maintenance cost. Covers data collection, parameter interpretation, and when PM is counterproductive.
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