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Engineering Calculator · 029

Cable Gland Enlarger Ratio Calculator

Compare source and target nominal diameters to calculate enlargement ratio and circular-area increase.

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 area256%
Circular-area increase156%

Formula
RD=DtDsR_D=\frac{D_t}{D_s}ΔAAs=(DtDs)2−1\frac{\Delta A}{A_s}=\left(\frac{D_t}{D_s}\right)^2-1

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

Direct answer

What this result means

An enlarger changes from a smaller source nominal diameter to a larger target diameter. Diameter ratio is target divided by source; circular-area increase follows the square of the diameter ratio. The result is not a thread cross-reference.

Cable Gland Enlarger Ratio Calculator engineering relationship diagramThe area comparison helps describe scale change, while the actual bore and external envelope must come from the adaptor drawing. This dedicated schematic represents thread enlarger and is not to scale.ENTRY ENLARGEMENT GEOMETRY · TOOL 029Source nominal diameterDiameter ratio
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

The area comparison helps describe scale change, while the actual bore and external envelope must come from the adaptor drawing.

Calculation relationship
RD=DtDsR_D=\frac{D_t}{D_s}ΔAAs=(DtDs)2−1\frac{\Delta A}{A_s}=\left(\frac{D_t}{D_s}\right)^2-1

The area comparison helps describe scale change, while the actual bore and external envelope must come from the adaptor drawing.

Formula terms

Variables

DsourceSmaller source nominal diametermm
DtargetLarger target nominal diametermm
ReDiameter enlargement ratio—

Use sequence

From measurement to review

  1. Identify source and target thread families before entering their nominal diameters.
  2. Calculate the geometric scale change.
  3. Check adaptor bore, outside dimensions, available space and thread engagement.

Limits

What this calculation does not confirm

  • Circular nominal diameters are compared.
  • The calculation does not convert between Metric, PG, NPT or other thread systems.
  • Mechanical and sealing suitability require the exact adaptor datasheet.

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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 enlarger 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 enlarger 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 thread designation be checked before using the cable gland enlarger ratio calculator result?

Verify thread designation, pitch, gender, available bore and installation envelope.

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