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e-CFR data is current as of April 17, 2015

Title 29Subtitle BChapter XVIIPart 1917Subpart F → §1917.121

Title 29: Labor
Subpart F—Terminal Facilities

§1917.121   Spiral stairways.

(a) Definition. “Spiral stairway” means one with closed circular form, uniform sector-shaped treads and a supporting column.

(b) Requirements. Spiral stairways shall meet the following requirements:

(1) Stairways shall conform to the minimum dimensions of Figure F-1;

eCFR graphic ec21oc91.020.gif

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Spiral Stairway—Minimum Dimensions

  A (half-tread width) B
Normal use by employees11 inches (27.94 cm)6 inches (15.24 cm).
Limited access9 inches (22.86 cm)5 inches (12.7 cm).

(2) Stairway risers shall be uniform and shall range from 612 to 1012 inches (16.5 to 26.67 cm) in height;

(3) Minimum loading capability shall be 100 pounds per square foot (4.79kN), and minimum tread center concentrated loading shall be 300 pounds (1334 N);

(4) Railings shall conform to the requirements of §1917.112(c)(1). If balusters are used, there shall be a minimum of one per tread. Handrails shall be a minimum of 114 inches (3.18 cm) in outside diameter; and

(5) Vertical clearance shall be at least 6 feet, 6 inches (1.98 m) above the top step.

(c) Maintenance. Spiral stairways shall be maintained in safe condition.

[48 FR 30909, July 5, 1983, as amended at 62 FR 40201, July 25, 1997; 65 FR 40942, June 30, 2000]

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