Fastener Guide / Engineering & Failure Analysis

Galling and Seizure

Galling is thread seizure from adhesive wear, where surfaces cold-weld during tightening. It is common with stainless on stainless and with titanium or aluminum.

Last reviewed 2026-09-10 · Governing standard: ASTM F593-24 / F594 (appendix on galling); maker guidance · reference FG-5768B4 · Report an error on this sheet

Galling at a glance

Most at riskStainless bolt with stainless nut, fast power tools, fine threads
SignsRising torque, nut locks mid-run, torn threads
PreventionAnti-seize, slower tightening, different nut alloy or condition, coated nuts, coarse threads
After it gallsDo not force it back; cut and replace

Governing standards: ASTM F593-24 / F594 (appendix on galling); maker guidance. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take precedence over this sheet.

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

The printed sheet

Galling and Seizure

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Text version of this sheet

Galling and seizure

What it is

FAILURE MODE

Galling is thread seizure from adhesive wear, where surfaces cold-weld during tightening. It is common

with stainless on stainless and with titanium or aluminum.

Galling: threads cold-weld and seize

Galling at a glance

Most at risk

Stainless bolt with stainless nut, fast power tools, fine threads

Signs

Rising torque, nut locks mid-run, torn threads

Prevention

Anti-seize, slower tightening, different nut alloy or condition, coated nuts, coarse threads

After it galls

Do not force it back; cut and replace

Governing standards: ASTM F593-24 / F594 (appendix on galling); maker guidance. 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-5768B4 · thefastenerapp.com/fastener-guide/failure-analysis/galling-and-seizure · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

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