We're the manufacturer of our aluminum half couplings. We machine them in-house on our own CNC lathes using USA 6061-T6 bar stock.
Boyd Half couplings thread profile conform to ASME B1.20.1 and are very comparable to ones that you purchase from industrial supply houses.
Boyd half couplings are usually stocked by the hundreds. If for some reason we don't have it immediately available we can meet whatever your needs are within 2 weeks. If you have the time to wait, go ahead and place your order and in the notes section let us know that you can wait or to split the shipment.
NPT Fitting Sizes are based on the "PIPE" that would typically thread into these couplings. Use the Chart below to find the proper size match.
Its important to understand that both the Male and Female NPT fitting has a 1.8 DEG taper applied to the thread. This taper is intended to create an interference fit once threaded together. It is expected that the male mating fitting will not thread all the way down. Sufficient tightness is created approx 1 turn or less past hand tight, any further and you risk damaging the fitting. To get a liquid tight seal you will need to use thread sealant that is appropriate for your application.
NPT Half Couplings are tapered threaded fittings and can only be threaded from one end. Typically one end of the fitting has a large chamfer on the outside that designates "UP". You should always verify yourself before welding.
All Fittings are quality checked with an L1 NPT Thread Gauge (See diagram below) before we add them to inventory. We will not replace improperly welded fittings.
CAN YOU USE AN ALTERNATE NPT FITTING? CHECK THESE OUT.