The https://www.pmc-colinet.com RPP20 pipe threader and finishing machine is Designed for API & Premium Connections.
You can get these, supplies & more details at https://amzn.to/2pNy5YB OR https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575119394&toolid=10001&campid=5337842430&customid=Libra+SW&icep_item=131597578073&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg 5 Lug 3500 To change from the 4 on 9.44 Wheels to Modern Wheels.
THE KIT –
2 x trailer 5 on 4.5″ hub drum kits + 2 x 10″x 2-1/4″ electric brakes for Dexter and other brands 3,500 lbs trailer axle.
Drum Bolt pattern: 5 on 4.5″, bearing races and 1/2″-20 studs installed
Kits includes 2 x L68149 inner cone bearings, 2 x L44649 outer cone bearings, 2 x Grease seals 1.719″ x 2.565″, 2 x E Z lube grease caps with rubber plug.
You get 10 cone taper wheel/lug nuts 1/2″-20 thread
Each set is one left + one right 10″x 2-1/4″ electric brakes with 3″ center bore and a 4″ mounting bolts circle diameter