Fastener Guide / Specification & Engineering Control

Fastener Substitution / Equivalent Approval

A substitute must meet or exceed every requirement of the original: dimensions, material, strength, finish and quality. Only the design authority can approve it.

Last reviewed 2026-09-10 · Governing standard: Engineering change practice · reference FG-F169F9 · Report an error on this sheet

Substitution: a higher grade is not automatically a safe replacement. Nut, washer, coating, hardness and the design all have to agree. The drawing and the engineer govern.

Before approving a substitute

CheckWhy
Same product standard and dimensionsFit and function
Equal or better strength, with matching nutLoad capacity without new failure modes
Compatible finishCorrosion, friction and HE risk
Same thread series and classAssembly
Documented approvalTraceability and liability

These tables carry the same figures as the printed sheet below.

The printed sheet

Fastener Substitution / Equivalent Approval

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Text version of this sheet

Fastener substitution and equivalent approval

What it is

AT A GLANCE

APPROVAL

A substitute must meet or exceed every requirement of the original: dimensions, material, strength,

finish and quality. Only the design authority can approve it.

Substitutes need written approval

Before approving a substitute

Check

Why

Same product standard and dimensions

Fit and function

Equal or better strength, with matching nut

Load capacity without new failure modes

Compatible finish

Corrosion, friction and HE risk

Same thread series and class

Assembly

Documented approval

Traceability and liability

Key points

Higher strength is not always better: it can raise HE risk and overload a weaker nut or tapped hole.

Governing standards: Engineering change practice. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take precedence

over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-F169F9 · thefastenerapp.com/fastener-guide/specification-control/fastener-substitution-equivalent-approval · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← How to Eliminate Unnecessary Special FastenersEngineering Change and Deviation Control →

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Hardware and Building Supplies4%33
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