# prefabricated-access-frame-maximum-rung-spacing — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For prefabricated-access-frame-maximum-rung-spacing, paragraph citation is 1926.451(e)(6)(vi); type of requirement is maximum spacing; value (imperial) is 163⁄4 inches; value (metric) is 43 cm; applies to is Integral prefabricated scaffold access frames, recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** prefabricated-access-frame-maximum-rung-spacing _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(e)(6)(vi) _(our reading, not quoted from the source)_
- **Type of requirement:** maximum spacing _(our reading, not quoted from the source)_
- **Value (imperial):** 163⁄4 inches _(verified: appears in the quote below)_
- **Value (metric):** 43 cm _(verified: appears in the quote below)_
- **Applies to:** Integral prefabricated scaffold access frames _(verified: appears in the quote below)_
- **Regulation section heading:** Access _(verified: appears in its own passage below)_

## What the source says

> (6) Integral prefabricated scaffold access frames shall: (i) Be specifically designed and constructed for use as ladder rungs; (ii) Have a rung length of at least 8 inches (20 cm); (iii) Not be used as work platforms when rungs are less than 111⁄2 inches in length, unless each affected employee uses fall protection, or a positioning device, which complies with § 1926.502 ; (iv) Be uniformly spaced within each frame section; (v) Be provided with rest platforms at 35-foot (10.7 m) maximum vertical intervals on all supported scaffolds more than 35 feet (10.7 m) high; and (vi) Have a maximum spacing between rungs of 163⁄4 inches (43 cm). Non-uniform rung spacing caused by joining end frames together is allowed, provided the resulting spacing does not exceed 163⁄4 inches (43 cm).

## 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/).