# crawling-board-grabline-minimum-diameter — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For crawling-board-grabline-minimum-diameter, paragraph citation is 1926.451(g)(1)(iii); type of requirement is minimum diameter; value (imperial) is three-fourth inch; value (metric) is 1.9 cm; applies to is Each employee on a crawling board (chicken ladder), recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** crawling-board-grabline-minimum-diameter _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(g)(1)(iii) _(our reading, not quoted from the source)_
- **Type of requirement:** minimum diameter _(our reading, not quoted from the source)_
- **Value (imperial):** three-fourth inch _(verified: appears in the quote below)_
- **Value (metric):** 1.9 cm _(verified: appears in the quote below)_
- **Applies to:** Each employee on a crawling board (chicken ladder) _(verified: appears in the quote below)_
- **Regulation section heading:** Fall protection _(verified: appears in its own passage below)_

## What the source says

> (iii) Each employee on a crawling board (chicken ladder) shall be protected by a personal fall arrest system, a guardrail system (with minimum 200 pound toprail capacity), or by a three-fourth inch (1.9 cm) diameter grabline or equivalent handhold securely fastened beside each crawling board;

## 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

> (g) Fall protection.

## 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/).