The Society of Automotive Engineers (SAE) has standardized the mounting flanges for hydraulic pumps and motors using a letter codes and the number of bolts used. Plus, manufacturers can often bring a product to market quicker since there aren’t many custom options. The fewer the choices, the easier it is on engineers. The standard takes a seemingly infinite number of combinations and boils it down to a manageable number of combinations. SAE led the way with standardized shafts and mounting flanges in SAE J744. There was a standardization that took place years ago. Why aren’t there more? Also, what about the outside of the parts? They look like they were designed to be mated with something. With the use of these couplers, we can adapt and fit many different types of shafts together, but interestingly, there are so few choices! Granted, there are lots of choices in the catalogue, but it seems that there should be many more shaft sizes, spline cuts and keys to choose from. Jaw-style couplers help with joining shafts together. Straight sided splines are all to SAE standard.It is not uncommon that we will need to couple pumps, motors and/or engines together. Actual major diameter may be smaller than form diameter by the form clearance for the subject spline. Spline OD* as listed for shafting, stubwelds and nibs is the form diameter. Pressure angles on all involute splines listed are 30 degrees. Imperial involute splines are to ANSI B92.I-1970. In some instances undercut chucking registers may be present at one end.

Splined shafting is hobbed for the full listed length. Couplings have thin wall, take care if welding. They are intended for joining two splined shafts together and the outside diameter of the coupling cannot be guaranteed to be true to the axis of the spline. SPLINED COUPLINGS are manufactured from K1045 Carbon steel. Preheat parts to 200☌ temp before welding. For best results use a stainless steel electrode such as STAINCRAFT (CIG). Welding operations should be carried out using a low hydrogen electrode. Hub outside diameter reflects a tolerance of - 0.000” + 0.001”.

All items are supplied in soft condition and may be induction or case hardened. is machined true to spline axis after broaching. SPLINENED HUBS are manufactured from K1045 Carbon Steel.

Sae 6b spline dimensions