Press Fit / Clearance Checker - Shaft/Bore Review Prompt
Check interference or clearance between shaft and bore against ISO/ANSI tolerance classes
Free source-aware press fit and clearance prompt for reviewing measured shaft-to-bore difference. Enter nominal diameter, measured shaft OD, measured bore ID, engagement length, a local RC/LC/LT/LN/FN fit-row prompt, and assembly context. The app reports interference or clearance, local row range, simplified steel contact-pressure and force prompts, and a rough steel thermal expansion prompt. It does not reproduce licensed ASME B4.1 or ISO 286 tables, approve a bearing fit, select a manufacturer fit class, create an inspection record, size a press, or authorize pressing/heating work.
Screen thermal growth impact on fit before manufacturer and drawing review
Thermal Growth Calculator →Screen press or pull force prompts before selecting rated tooling
Bearing Puller Force Estimator →Review bearing speed and clearance context before manufacturer mounting decisions
Bearing Speed Limit Checker →Compare ISO tolerance-zone prompts separately from this ASME/ANSI local row screen
Tolerance Fit Calculator →How It Works
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Enter Measured Dimensions
Input nominal diameter, measured shaft OD, measured bore ID, and engagement length in inches or millimeters. The app treats shaft minus bore as the measured difference.
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Choose a Local Fit Row
Select a local ASME/ANSI-style RC, LC, LT, LN, or FN row prompt. The local rows are not licensed-table reproduction and must be checked against the current standard, drawing, and product data.
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Set Assembly and Material Context
Select press, thermal, or manual context and whether the local steel baseline is reasonable. Other materials and bearing-specific use keep manufacturer and material gaps visible.
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Review the Source Boundary
Use the warnings to see what is not solved: ISO 286 tables, bearing internal clearance, manufacturer mounting data, material stress, hub geometry, inspection uncertainty, tooling, and safe-work controls.
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Document the Gaps
Export the report only as a review prompt. Do not use it as an inspection acceptance record, press setup, thermal procedure, or engineering approval.
Built For
- Millwrights documenting measured shaft-bore difference before escalating to the drawing and bearing manufacturer
- Machinists comparing measured dimensions to a local fit-row prompt before final tolerance review
- Reliability teams screening possible creep, fretting, or over-tight fit causes without claiming root cause
- Quality inspectors preparing a source-gap note before formal inspection disposition
- Engineers checking whether simplified steel pressure and force prompts need a full interference-fit study
Assumptions
- Positive shaft minus bore difference is reported as interference; negative difference is reported as clearance.
- Local RC, LC, LT, LN, and FN rows are stored as ASME/ANSI-style source-gap prompts and converted for metric display.
- Contact pressure and force prompts assume steel-on-steel, simplified geometry, and a local friction coefficient.
- Thermal prompt uses a rough steel coefficient of thermal expansion and does not solve product temperature limits.
Limitations
- Does not reproduce licensed ASME B4.1 or ISO 286 tables or approve a tolerance class.
- Does not determine bearing internal clearance, manufacturer mounting fit, residual clearance, or operating temperature suitability.
- Does not check hub stress, hollow shaft behavior, wall thickness, material yield, Poisson ratio, keyways, grooves, coatings, lubrication, or fatigue.
- Does not create an inspection acceptance record, shop traveler, press setup, thermal procedure, LOTO plan, PPE plan, or safe-work authorization.
References
- ASME B4.1 - Preferred Limits and Fits for Cylindrical Parts
- ISO 286-1 and ISO 286-2 - ISO code system for tolerances on linear sizes
- ASME Y14.5 - Dimensioning and Tolerancing
- Machinery's Handbook - press, shrink, and interference-fit reference context
- OSHA 29 CFR 1910.212 and 1910.147 - machine guarding and hazardous-energy controls
Frequently Asked Questions
Learn More
Bearing Fits: Why Thousandths of an Inch Matter
How to review shaft-fit source boundaries, why loose or tight fits create different risks, and what manufacturer, drawing, inspection, and thermal gaps control.
Thermal Growth and Bearings: What Changes When Machines Heat Up
How temperature affects shaft fit, housing fit, alignment, and internal clearance. CTE values for common materials and when to use C3 or C4 clearance bearings.
Bearing Installation: Getting It Right Without Damaging the Bearing
Pressing, heating, pulling, and the installation mistakes that create the next failure. When to use an induction heater versus a hydraulic press.
Bearing Removal Force: How Much Pull Does It Take?
Estimating press and pull force for safe bearing installation and removal. When to use mechanical pullers, hydraulic pullers, or induction heating.
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