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Engineering Calculator · 008

Seal Radial Interference Calculator

Calculate diametral and radial interference between a cable OD and an uncompressed circular seal opening.

Cable dimensions
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

Diametral interference1.5mm
Radial interference0.75mm
Diameter-based interference9.09%

Formula
id=Dcable−Dseali_d=D_{\mathrm{cable}}-D_{\mathrm{seal}}ir=Dcable−Dseal2i_r=\frac{D_{\mathrm{cable}}-D_{\mathrm{seal}}}{2}

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

Direct answer

What this result means

Diametral interference is cable OD minus seal opening ID. Radial interference is half that difference. A positive result means geometric overlap; a negative result means clearance. Neither result defines sealing pressure or allowable compression without material and product data.

Seal Radial Interference Calculator engineering relationship diagramThis is a dimensional interference calculation only. Elastomer modulus, gland compression geometry, friction, temperature and tolerances control the installed contact condition. This dedicated schematic represents seal radial interference and is not to scale.SEAL GEOMETRY · TOOL 008Cable outside diameterDiametral interference
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

This is a dimensional interference calculation only. Elastomer modulus, gland compression geometry, friction, temperature and tolerances control the installed contact condition.

Calculation relationship
id=Dcable−Dseali_d=D_{\mathrm{cable}}-D_{\mathrm{seal}}ir=Dcable−Dseal2i_r=\frac{D_{\mathrm{cable}}-D_{\mathrm{seal}}}{2}

This is a dimensional interference calculation only. Elastomer modulus, gland compression geometry, friction, temperature and tolerances control the installed contact condition.

Formula terms

Variables

DsealUncompressed seal opening diametermm

Use sequence

From measurement to review

  1. Measure the cable OD and identify whether the seal dimension is nominal or measured.
  2. Calculate overlap or clearance using the same length unit.
  3. Compare the geometry with the manufacturer’s sealing range and installation instructions.

Limits

What this calculation does not confirm

  • Both cable and opening are treated as circular.
  • The percentage is referenced to seal opening diameter, not elastomer strain energy.
  • No sealing performance or ingress rating is inferred from geometric interference alone.

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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 guidanceHow does the seal radial interference calculator apply the difference between cable diameter and seal opening diameter?

The tool applies the difference between cable diameter and seal opening diameter. It keeps the entered values, units and assumptions visible so the result can be checked or repeated.

02Calculator guidanceWhat engineering review can the seal radial interference calculator support?

It supports a preliminary review based on the difference between cable diameter and seal opening diameter. It does not select a final cable-gland model or confirm standards compliance, ingress performance or installation approval.

03Calculator guidanceWhy must whether the seal ID is an uncompressed reference dimension and use the published gland sealing range for the final check be checked before using the seal radial interference calculator result?

Verify whether the seal ID is an uncompressed reference dimension and use the published gland sealing range for the final check.

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.

Request product support