Planning and Dimensional
Information

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

Stock Number: USS140-86-QT
Stair Diameter: 14'- 0" (426.72cm)
Minimum Opening: 87" x 110 (220.98cm x 279.4cm)
Outside Radius: 84" (213.36cm)
Inside Radius: 43" (109.22cm)
Stringer Width, Outer: 11 - 1/4" (28-58cm)
Stringer Width, Inner: 8" (20.32cm)
Stringer Thickness: 2" (50.8mm) - Opt. 2 -1/2" (63.5mm) or 3" (76.2mm)
Tread Width at Outer Stringer: 12 -1/2" (31.75cm)
Tread Width at Inner Stringer: 7 - 1/2" (19.05cm)
Tread Thickness: 1 - 1/2" (38.1mm)
Tread Passageway: 37" (93.98cm) - Opt. 35" (88.9cm) or 36" (91.44cm)
Handrail Width: 4 - 1/2" (11.43cm) - Opt. 5 - 1/2" (13.97cm)
Handrail Thickness: 2" (50.8mm) - Opt. 2 - 1/2" (63.5mm) or 3" (76.2mm)
Baluster Spacing: Approx. 6" (15.24cm), - Opt. 4" (10.16cm), or alternating 2", 3", 2"
Turn per Inch of Rise: 0.9375 Degrees
Rise per Degree of Turn: 1.067" (27.l mm)
Floor to Floor Risers Degrees of Turn
74" to 82"   (1 87.96cm to 208.28cm) 10 62 to 69 Degrees
>82" to 90"   (208.28cm to 228.60cm) 11 69 to 77 Degrees
>90" to 98"   (228.60cm to 248.92cm) 12 77 to 84 Degrees
>98" to 106"   (248.92cm to 269.24cm) 13 84 to 92 Degrees
>106" to 114"   (269.24cm to 289.56cm) 14 92 to 99 Degrees
> 1 14" to 122"    (289.56cm to 309.88cm) 15 99 to 107 Degrees
Tread Capacity
lbs. / kgs.
1080 / 492 Stair Capacity
lbs. / kgs.
@ 114" Ht.
7306 / 3316

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