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Planning and
Dimensional |
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Planning and
Dimensional |
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4 Ft. - 6 In. Diameter, Three Quarter Turn Series, Spiral Stair
| Stock Number: | USS46-10-3QT |
| Stair Diameter: | 4' - 6" (137.16cm) |
| Minimum Opening: | 58" x 58" (142.24cm x 142.24cm) |
| Outside Radius: | 27" (68.58cm) |
| Inside Radius: | 5" (12.7cm) |
| Stringer Width, Outer: | 9 - 3/4' (24.8cm) |
| Stringer Width, Inner: | 5" (12.7cm) |
| Stringer Thickness: | 1 - 1/2" (38.1 mm) |
| Tread Width at Outer Stringer: | 12 -1/2" (31.75cm) |
| Tread Width at Inner Stringer: | 4-1/2" (11.43cm) |
| Tread Thickness: | 1 - 1/2" (31.75mm) |
| Tread Passageway: | 19" (48.26cm) |
| Handrail Width: | 2 -1/2" (6.35cm) - Opt. 3 - 1/2" (8.09cm) or 1- 1/2" (3.81cm) |
| Handrail Thickness: | 1 - 1/2" (38.1 mm) |
| Baluster Spacing: | Approx. 6" (15.24cm), Opt. 4' (10.16cm), or alternating 2", 3",2" |
| Turn per Inch of Rise: | 2.857 Degrees |
| Rise per Degree of Turn: | 0.35" (8.89mm) |
| Floor to Floor | Risers | Degrees of Turn |
| 74" to 82" (187.96cm to 208.28cm) | 9 | 188 to 208 Degrees |
| >82" to 90" (208.28cm to 228.60cm) | 10 | 208 to 231 Degrees |
| >90" to 98" (228.60cm to 248.92cm) | 11 | 231 to 255 Degrees |
| >98" to 106" (248.92cm to 269.24cm) | 12 | 255 to 278 Degrees |
| >106" to 114" (269.24cm to 289.56cm) | 13 | 278 to 301 Degrees |
| >114" to 122" (289.56cm to 309.88cm) | 14 | 301 to 324 Degrees |
| >122" to 130" (309.88cm to 330.20cm) | 15 | 324 to 347 Degrees |
| Tread Capacity lbs. / kgs. |
1051 / 477 | Stair Capacity lbs. / kgs. @ 114" Ht. |
1752 / 795 |
Specifications for heights up to 190" (4.83m) are available upon request.