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