Fastener Guide / Engineering & Failure Analysis

Thread Stripping

Stripping is when the threads shear off, usually on the nut or tapped hole, while the bolt body is intact.

Last reviewed 2026-09-10 · Governing standard: ASME B1.1-2023; ISO 898-2:2022; FED-STD-H28 · reference FG-448A0E · Report an error on this sheet

Stripping at a glance

Typical causeShort thread engagement, weak nut, soft tapped material, oversize holes
Engagement rule of thumbSteel nut: at least 1 x diameter; aluminum tapped hole: about 2 x diameter
Other causesCross-threading, coating build-up, mismatched thread series
PreventionCorrect nut grade, full engagement, thread inserts in soft metals

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

The printed sheet

Thread Stripping

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Text version of this sheet

Thread stripping

What it is

FAILURE MODE

Stripping is when the threads shear off, usually on the nut or tapped hole, while the bolt body is intact.

stripped

Stripping: threads fail before the bolt

Stripping at a glance

Typical cause

Short thread engagement, weak nut, soft tapped material, oversize holes

Engagement rule of thumb

Steel nut: at least 1 x diameter; aluminum tapped hole: about 2 x diameter

Other causes

Cross-threading, coating build-up, mismatched thread series

Prevention

Correct nut grade, full engagement, thread inserts in soft metals

Key points

A nut should be the weaker link designed to fail by bolt fracture, not stripping; that is why nut grade must match the bolt.

Governing standards: ASME B1.1-2023; ISO 898-2:2022; FED-STD-H28. 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-448A0E · thefastenerapp.com/fastener-guide/failure-analysis/thread-stripping · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Shear FailureTorque / Preload Failure →

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