# stair-tread-depth-maximum-variation — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For stair-tread-depth-maximum-variation, paragraph citation is 1926.451(e)(4)(xiv); type of requirement is maximum variation; value (imperial) is 1⁄4 inch; applies to is Tread depth; regulation section heading is Access, recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** stair-tread-depth-maximum-variation _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(e)(4)(xiv) _(our reading, not quoted from the source)_
- **Type of requirement:** maximum variation _(our reading, not quoted from the source)_
- **Value (imperial):** 1⁄4 inch _(verified: appears in the quote below)_
- **Applies to:** Tread depth _(verified: appears in the quote below)_
- **Regulation section heading:** Access _(verified: appears in its own passage below)_

## What the source says

> (xiv) Tread depth shall be uniform, within 1⁄4 inch, for each flight of stairs.

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Regulation section heading

> (e) Access.

## Source

- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-L/section-1926.451

Last verified: 2026-09-14. Review by: 2027-08-31.
Part of [Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)](https://referencesource.org/osha-scaffold-dimensional-tolerances/).