5 Inch Gauge Fine Scale Wheel Standards

Information extracted from ”Code of Practice” document Appendix 5.
Refer to this document for more details.


5in Fine Scale profiles
Standard Wheel Dimensions:
  Imperial (inches) Metric (mm)
Back to Back (BB) 4.688 119.0
Flange Depth 0.140 3.6
Flange Thickness (FT) 0.106 2.7
Flange Angle - Front 12~20° 12~20°
Flange Angle - Rear 08°
Wheel Check (BB+FT) 4.794 121.7
Wheel Root Radius 0.07 1.8
Wheel Tyre Taper 1.5~2° 1.5~2°
Wheel Tyre Width (minimum) 0.535 13.6
Flange Tip Profile Half round

Rolling Stock Dimensions:
  Imperial (inches) Metric (mm)
Coupler Height (above rail) 31/4 82.5
Drawbar X-section (minimum) 5/8 x 3/16 16 x 5
Coupler Pin Diameter (minimum) 0.25 (1/4) 6.35
Running Gauge Clearance (minimum) 3/8 10