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Planning and
Dimensional |
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Planning and
Dimensional |
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6 Ft. - 6 In. Diameter, Three Quarter Turn Series, Spiral Stair
| Stock Number: | USS66-12-3QT |
| Stair Diameter: | 6' - 6" (198.12cm) |
| Minimum Opening: | 82" x 82" (205.74cm x 205.74cm) |
| Outside Radius: | 39" (99.06cm) |
| Inside Radius: | 6" (15.24cm) |
| Stringer Width, Outer: | 11 - 1/4" (28.58cm) |
| Stringer Width, Inner: | 5" (12.7cm) |
| Stringer Thickness: | 1 - 1/2" (38.1 mm) |
| Tread Width at Outer Strin-ger: | 14 - 1/2" (36.20cm) |
| Tread Width at Inner Stringer: | 4 - 3/4" (12.07cm) |
| Tread Thickness: | 1 - 1/2" (38.1 mm) |
| Tread Passageway: | 30" (76.2cm) |
| Handrail Width: | 3 - 1/2" (8.89cm) - Opt. 4 - 1/2" (11.43) or 5 -1/2" (13.97cm) |
| 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 |
>96" 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. |
717 / 325 | Stair Capacity lbs. / kgs. @ 114" Ht. |
1724 / 782 |
Specifications for heights up to 190" (4.83m) are available upon request.