LOAD BEARING COLLARS - ABYC H-27 RATED
TruDesign Load Bearing Collars are designed for use with TruDesign Skin Fittings and Ball Valves. A Load
Bearing Collar will allow an assembly of a Skin Fitting - Ball Valve - Tail to withstand a 500 lb. (227 kg) load
applied to the Tail (inboard end), for a minimum of 30 seconds - complying with North American ABYC H-27
standards. Compliance to this standard is mandatory for all vessels sold into the United States.
Technical:
- The below table shows the minimum and maximum thread length allowed to protrude inside the hull for each size skin fitting. This will ensure a snug fit of the collar against the hull. It should be noted that for very thin hulls that a backing plate be added to make the "effective hull thickness" a minimum of 20mm.
- The Skin Fitting can be shortened by cutting with a hacksaw. Measure the thread length from the top of the Skin Fitting Nut as pictured below. Then dry fit to ensure a snug fit against hull or backing plate.
- Ensure the thread length after cutting falls between the minimum and maximum values. Remove any ragged internal edges with a small file.
- For additional information on maximum hull thickness for different size skin fitting (Thru Hulls) refer to TruDesign skin fitting information sheet on our web site.
- If not installed correctly (e.g. if the Skin Fitting thread has not been reduced to a sufficient length) the Collar will be loose and will be able to move up and down the Ball Valve. When installed correctly, the Collar will be snug and not move
- For skin fitting installation refer to TruDesign Skin Fitting Information Sheet
