Forged Tow Bar Receiver 4 inch Drop Suit 70mm Ball
70mm Tow Ball suit 4.5 tonne heavy duty Electric Couplings. No CRN means the tow ball is not legal for use on Australian roads and highways.
- 32mm Shank
Trailers over 3.5t towing capacity made after 2009 using 70mm balls must comply with Australian standards and be ADR Approved.
Towing Balls over 3.5t must be tested for 2,000,000 cycles at the full, rated load.
A castellated nut and split pin have been supplied to enable the nut to be fixed with a pin after a torque wrench is applied.
70mm tow balls NOT marked in the fashion below, do NOT comply with Australia Standards. AS4771.2 demands
- Manufacturers mark.– Who is responsible for this tow ball.
- Tow Ball Rating – Max towing rating
- Tow Ball Size – What coupling this tow ball fits.
- Batch Number – Identifies potential batching problems. (new legislative requirement)
12.3.3. Over 3.5 tonnes ‘ATM’
184.108.40.206. Over 3.5 tonnes ‘ATM’ – ‘D-value’ rated Dynamic Testing
220.127.116.11.1. The horizontal alternating force of minimum (kN) +/- 0.6 x ‘Coupling’ ‘D-value’ (kN) acting in a line parallel to the ground and in the longitudinal median plane of the towing vehicle for at least 2 million cycles.
18.104.22.168. Over 3.5 tonnes ‘ATM’ – ‘D-value’ and ‘V-value’ rated Dynamic Testing
22.214.171.124.1. Horizontal alternating force of minimum (kN) +/- 0.6 x ‘Coupling’ ‘D-value’ (kN) acting in a line parallel to the ground and in the longitudinal median plane of the towing vehicle and a vertical alternating force of minimum (kN) static vertical ‘Coupling’ load +/- (0.6 x ‘Coupling’ ‘V-value’ (kN)) acting vertically for at least 2 million cycles.
The static vertical ‘Coupling’ load (kN) = 9.81 x S where: S = ‘ATM’ – ‘GTM’ (tonnes).
IMPORTANT NOTICE – 70mm Balls
Tow balls purchased from Couplemate Trailer Parts contain the certified CRN identification number on the Invoice. The CRN on the approval letter will be the same CRN on the Invoice.
Furthermore, show vehicle inspectors the invoice during the inspection of the trailer or vehicle if required.