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45mm Round Mechanical Drum Brake Kit – 1450kg$437.08 – $566.28 inc GST
45mm Square Mechanical Drum Brake Kit – 1450kg$646.45 – $816.70 inc GST
40mm Square Mechanical Drum Brake Kit – 1000kg$588.28 – $631.00 inc GST
Mechanical Override Brakes
9″ Mechanical Drum Brakes on 40mm Square and 45mm square Axles.
Mechanical drum brake axle ratings are 1450kg for a single axle or 2000kg for a tandem axle setup.
Axle ratings as follows
40mm and 45mm Axles are ideal for override trailers up to 200cm or 2 meters. Axle flex occurs in longer axles. Axle flex, in turn, causes vibration fatigue.
Trailers that are wider than 2 meters use 45mm Square axles. Stronger axles carry their load better and as such do not suffer axle fatigue.
Finally, this article is also a good read about why U-bolts may be the Major Cause of Accidents.