6mm galvanised slipper spring are measured 765mm eye to tip of the slipper.
Spring fatigue will stretch spings beyond 765mm.
- Spring Thickness
- The number of leaves.
Dacromet or Galvanised
The choice between Dacromet springs and Galvanised springs is not difficult. Dacromet springs vary greatly in quality.
As a result, Couplemate prefers Galvanised springs to last longer than most Dacroment coated springs.
- 765mm Eye to Tail.
- 6mm Leaf Thickness.
- 45mm Wide.
- The eyebolt is 1/2″.
- 1/2 inch x 7/8 inch x 45mm bush.
- Free Camber 150mm.
- Eye to Center Bolt 330mm.
- Hanger Centres 700mm.
6mm Slipper Spring Ratings.
- 3 Leaf – 300kg.
- 4 Leaf – 450kg.
- 5 Leaf – 500kg.
- 6 Leaf – 600kg.
- 7 Leaf – 675kg.
- 9 Leaf – 800kg.
45mm wide boat springs with 6mm leaf thickness are suitable for metropolitan travel.
How to beat vibration fatigue in boat trailers.
Compressing a spring with a hydraulic ram and measuring the torque required during compression, is one method to rate springs.
Finally, springs are galvanised and then rated.