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Interior and Exterior Wood Spiral Stairs


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


Back to Product Specs

Stock Number:
USS50-12-3QT
Stair Diameter:
5' - 0" (152.4cm)
Minimum Opening:
64" x 64" (160.02cm x 160.02cm)
Outside Radius:
30" (76.2cm)
Inside Radius:
6" (15.24cm)
Stringer Width, Outer:
10" (25.4cm)
Stringer Width, Inner:
5" (12.7cm)
Stringer Thickness:
1 - 1/2" (38.1mm)
Tread Width at Outer Stringer:
13 -1/2" (34.29cm)
Tread Width at Inner Stringer:
4 - 1/2" (11.43cm)
Tread Thickness:
1 - 1/2" (38.1 mm)
Tread Passageway:
21" (53.34cm)
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" (1 87.96cm 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.
1025 / 465
Stair Capacity lbs. / kgs. @ 114" Ht.
2036 / 924

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






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