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Planning and
Dimensional |
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Planning and
Dimensional |
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6 Ft. - 8 In. Diameter, Three Quarter Turn Series, Spiral Stair
| Stock Number: | USS68-12-3QT |
| Stair Diameter: | 60 - 8" (203.2cm) |
| Minimum Opening: | 84" x 84" (210.82cm x 210.82cm) |
| Outside Radius: | 40" (101.6cm) |
| 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 Stringer: | 14 - 3/4" (37.47cm) |
| Tread Width at Inner Stringer: | 4 - 3/4" (12.07cm) |
| Tread Thickness: | 1 -1/2" (38.1 mm) |
| Tread Passageway: | 31" (78.74cm) |
| 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 | Riser | 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. |
694 /315 | Stair Capacity lbs. / kgs. @ 114" Ht. |
1696 / 769 |
Specifications for heights up to 190" (4.83m) are available upon request.