click here to see how we are inspired...
Interior and Exterior Wood Spiral Stairs


7 Ft. - 0 In. Diameter, Three Quarter Turn Series, Spiral Stair


Back to Product Specs

Stock Number:
USS70-12-3QT
Stair Diameter:
7' - 0" (213.36cm)
Minimum Opening:
88" x 88" (220.98cm x 220.98cm)
Outside Radius:
42" (106.68cm)
Inside Radius:
6" (15.24cm)
Stringer Width, Outer:
11 - 1/4" (28.58cm)
Stringer Width, Inner:
5" (12.7cm)
Stringer Thickness:
1 -1/2" (38.1mm)
Tread Width at Outer Stringer:
16 - 1/2" (41.91cm)
Tread Width at Inner Stringer:
4 - 3/4" (12.07cm)
Tread Thickness:
1 - 1/2" (38.1mm)
Tread Passageway:
33" (83.82cm)
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
>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.
728 / 390
Stair Capacity lbs. / kgs. @ 114" Ht.
2570 / 1160

Specifications for heights up to 190" (4.83m) are available upon request.






Spiral Stair - Non Mobile Gallery  –Site Map