Locating Pin Fit Calculator

Formula

• Pin max = nominal + upper deviation
• Hole min = nominal + lower deviation
• Clearance = hole size − pin size at each limit
• Press force ≈ μ × p × π × D × L for interference

About this calculator

Part of our Fixture & Tooling Calculators collection. Clamping, locating pins, tolerance stack-up, and gauge R&R.

How it works

Max and min pin and hole sizes come from nominal diameter plus tolerance deviations. Clearance limits show the fit range at assembly. Interference fits estimate contact pressure and press or extraction force from elastic properties and friction.

Enter your values in the inputs above and click CALCULATE. Results appear on the right without a page reload. No login and no server upload.

Worked example

10 mm locating pin with typical H7/n6 style deviations.

1. Pin 9.983 to 9.994 mm
2. Hole 10.000 to 10.018 mm
3. Clearance 0.006 to 0.035 mm → clearance fit

Result: Clearance fit; no press force on assembly.

When to use

• Checking pin-hole fit class before fixture detail design
• Estimating press or extraction force on interference pins
• Validating locating pin tolerance stack with part tolerances

Limitations

• Press-fit pressure uses simplified elastic model
• Assumes cylindrical pin and hole without taper or chamfer effects
• Material modulus from preset table unless custom is selected

FAQ

Clearance vs interference locating pins?

Primary locators often use slight clearance for easy loading. Dowel pins for repeatability may use light interference or line-to-line fits.

What is fit code?

Clearance (always gap), interference (always overlap), or transition (depends on actual sizes within tolerance).