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


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


Back to Product Specs

Stock Number:
USS56-12-3QT
Stair Diameter:
5' - 6" (167.64cm)
Minimum Opening:
70" x 70" (175.26cm x 175.26cm)
Outside Radius:
33" (83.82cm)
Inside Radius:
6" (15.24cm)
Stringer Width, Outer:
11" (27.94cm)
Stringer Width, Inner:
5" (12.7cm)
Stringer Thickness:
1 - 1/2" (38.1 mm)
Tread Width at Outer Stringer:
14 (35.56cm)
Tread Width at Inner Stringer:
4 - 1/2" (11.43cm)
Tread Thickness:
1 - 1/2" (38.1 mm)
Tread Passageway:
24" (60.96cm)
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" (206.28cm 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.
896 / 406
Stair Capacity lbs. / kgs. @ 114" Ht.
1920 / 871

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






Spiral Stair - Non Mobile Gallery  –Site Map