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ENEnglish繁中繁體中文ESEspañolARالعربيةFRFrançaisITItalianoPTPortuguêsRUРусскийDEDeutschJA日本語VITiếng ViệtKO한국어THไทยTRTürkçe

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Engineering Calculator · 028

Cable Gland Reducer Ratio Calculator

Compare source and target nominal diameters to calculate diameter ratio and circular-area reduction.

Threads & entry 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

Diameter ratio1.6:1
Target circular area39.06%
Circular-area reduction60.94%

Formula
RD=DsDtR_D=\frac{D_s}{D_t}AtAs=(DtDs)2\frac{A_t}{A_s}=\left(\frac{D_t}{D_s}\right)^2

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

Direct answer

What this result means

A reducer changes from a larger source nominal diameter to a smaller target diameter. Diameter ratio is source divided by target; circular-area comparison uses the square of the diameter ratio. Nominal diameter comparison does not prove thread compatibility.

Cable Gland Reducer Ratio Calculator engineering relationship diagramCircular area varies with diameter squared. The calculation is a geometric comparison and does not model wall thickness, thread profile or flow. This dedicated schematic represents thread reducer and is not to scale.ENTRY REDUCTION GEOMETRY · TOOL 028Source nominal diameterDiameter ratio
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

Circular area varies with diameter squared. The calculation is a geometric comparison and does not model wall thickness, thread profile or flow.

Calculation relationship
RD=DsDtR_D=\frac{D_s}{D_t}AtAs=(DtDs)2\frac{A_t}{A_s}=\left(\frac{D_t}{D_s}\right)^2

Circular area varies with diameter squared. The calculation is a geometric comparison and does not model wall thickness, thread profile or flow.

Variables

DsourceLarger source nominal diametermm
DtargetSmaller target nominal diametermm
RdDiameter reduction ratio—

Use sequence

From measurement to review

  1. Enter nominal diameters only after identifying source and target thread families.
  2. Calculate diameter and circular-area ratios.
  3. Select an adaptor only from matching thread designations and current dimensional drawings.

Limits

What this calculation does not confirm

  • Both compared areas are treated as circles.
  • Nominal diameters are not treated as thread interchangeability evidence.
  • Adaptor wall thickness, bore and mechanical strength are outside this calculation.

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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 cable gland reducer ratio calculator apply nominal diameter ratio and circular area ratio?

The tool applies nominal diameter ratio and circular area ratio. It keeps the entered values, units and assumptions visible so the result can be checked or repeated.

02Calculator guidanceWhat engineering review can the cable gland reducer ratio calculator support?

It supports a preliminary review based on nominal diameter ratio and circular area ratio. It does not select a final cable-gland model or confirm standards compliance, ingress performance or installation approval.

03Calculator guidanceWhy must both thread families be checked before using the cable gland reducer ratio calculator result?

Verify both thread families, pitches, gender, usable bore and complete adaptor drawing.

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