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Engineering Calculator · 125

Average Seal Contact Pressure Calculator

Calculate mean seal-contact pressure from an independently known normal force and actual load-bearing contact area.

Seal geometry
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Average seal contact pressure2MPa
Average seal contact pressure20bar

Formula
pavg=FnAcp_{\mathrm{avg}}=\frac{F_n}{A_c}1 N/mm2=1 MPa1\,\mathrm{N/mm^2}=1\,\mathrm{MPa}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

Average contact pressure is the normal force divided by the actual contact area. A 100 N normal force over 50 mm² gives 2 MPa, or 20 bar. This is a mean value; it does not describe minimum local pressure, force distribution or whether the complete seal will prevent leakage.

Average Seal Contact Pressure Calculator engineering relationship diagramUse force normal to the sealing surface and the area actually carrying that force. A tightening torque, total gland exterior area or projected pressure area does not automatically provide these inputs. The figure shows distributed normal loading; real contact pressure can vary around the seal. This dedicated schematic represents seal normal load distributed contact area and is not to scale.Distributed normal force F_nLoad-bearing contact area A_cNORMAL FORCE OVER CONTACT AREA · TOOL 125Normal contact forceAverage seal contact press…
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

Use force normal to the sealing surface and the area actually carrying that force. A tightening torque, total gland exterior area or projected pressure area does not automatically provide these inputs. The figure shows distributed normal loading; real contact pressure can vary around the seal.

Calculation relationship
pavg=FnAcp_{\mathrm{avg}}=\frac{F_n}{A_c}1 N/mm2=1 MPa1\,\mathrm{N/mm^2}=1\,\mathrm{MPa}

Use force normal to the sealing surface and the area actually carrying that force. A tightening torque, total gland exterior area or projected pressure area does not automatically provide these inputs. The figure shows distributed normal loading; real contact pressure can vary around the seal.

Formula terms

Variables

AcActual load-bearing contact areamm²

Use sequence

From measurement to review

  1. Identify the sealing contact surface and obtain its normal load and actual contact area.
  2. Enter force in newtons and contact area in square millimetres.
  3. Use the mean pressure for a stated preliminary comparison and assess local contact, relaxation and complete-product tests separately.

Limits

What this calculation does not confirm

  • Force is a nonnegative magnitude and area is positive; the arithmetic gives only the spatial average.
  • Material stiffness, gland geometry, friction, local pressure gradients and force relaxation are not modeled.
  • A mean contact pressure above fluid pressure is not by itself evidence of sealing, IP classification or installation approval.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceWhy is seal contact pressure called an average here?

Dividing total normal force by total contact area gives a mean. The calculation does not reveal low-pressure paths, local peaks or whether every point remains in contact.

02Calculator guidanceCan tightening torque be entered as normal seal force?

No. Torque and normal force have different units and their relationship depends on construction, friction and load transfer. Obtain normal force independently before using this calculation.

03Calculator guidanceDoes mean seal pressure greater than water pressure establish leak tightness?

No. Local gaps, roughness, cable geometry, relaxation and installation can control leakage. Verify the complete assembly with a suitable test rather than treating the average as a sealing criterion.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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