Mechanical & Civil Engineering
Press-Fit Interference Contact Pressure Calculator
Estimate the contact pressure and required mounting force for a cylindrical press-fit interference joint.
Your inputs
Change any value to update the result instantly.
Contact pressure
100 MPa
Mounting force
56,548.7 N
Engagement length
30 mm
Diametral interference
0.02 mm
What this calculator does
Press-Fit Interference Contact Pressure Calculator: Applies the standard shop-floor or joint-design relationship so the force, speed, allowance or strength can be worked out from the process inputs.
What your result means
The headline figure is the process setting or joint strength implied by your inputs. Treat it as a starting point to validate against the tool maker's data and a trial part.
Formula and working
p = δ × E ÷ D; F = π × D × L × p × μ
- 1
Collect the inputs
Diametral interference = 0.02 mm; Nominal joint diameter = 40 mm; Engagement length = 30 mm; Modulus of elasticity = 200,000 MPa; Coefficient of friction = 0.15
- 2
Apply the formula
p = δ × E ÷ D; F = π × D × L × p × μ
- 3
Result
Contact pressure = 100 MPa
Frequently asked questions
Symbols and assumptions
- interference
- Diametral interference (mm)
- diameter
- Nominal joint diameter (mm)
- length
- Engagement length (mm)
- modulus
- Modulus of elasticity (MPa)
- friction
- Coefficient of friction
- • Nominal tooling, material and process conditions are assumed; machine, tool-wear and lubrication effects vary in practice.
- • Recommended cutting data always sits inside the tool maker's published envelope, which takes priority.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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