Single stage gearheads have SINGLE in the file name 
and are for PS and PX series gearheads with reduction of 3:1 to 10:1

Double stage gearheads have DOUBLE in the file name 
and are for PS and PX series gearheads with reduction of 15:1 to 100:1

Note each gearhead has the model with the standard mounting kit, either
the short or long adapter. The file name will indicate the thickness of the 
AD adapter in the file name. Example, the PS60-X2-SINGLE-16_5-AD.stp includes
the 16.5mm thick adapter.

Which adapter does your mounting kit use?
1. The mounting kit search database on our website indicates the adapter thickness
and indicates general dimensions for that particular motor.
2. This is a function of the length of the motor shaft.
Frame	Motor shaft length   Adapter Length
60	16.0 - 35mm		16.5mm
60	35.1 - 41mm		22.5mm
90	20.0 - 40mm		20.0mm
90	40.1 - 48mm		28.5mm
115	22.0 - 50mm		24.0mm
115	50.1 - 61mm		35.0mm 
142	26.0 - 62m		30.0mm 
142	62.1 - 82mm		50.0mm 


This presumes the standard adapter flange is used in the mounting kit. 
If the motor is oversized or has an adapter different thickness than above
(shown in the mounting kit search results), you may email emn_support@parker.com 
with the gearhead part number and mounting kit for a stp solid model.

With the NEMA faced PX (PX23,PX34,PX42,RX23,RX34,RX42) the input of the of the 
gearhead is the same as the standard metric. ie, the PX/RX23 uses the MU60 mounting kits,
PX/RX34 uses the MU90, PX/RX42 the MU115.

The model does not include the bushings inside the pinion as there are different
size bushings for different motor shafts nor is the pilot recess or bolt circle taps shown.

Note the right-angle Stealth RS and RX series gearheads have one length housing for 
any ratio (5:1 up to 100:1) but still use the MU universal mounting kits, the same 
as the inline Stealth PS and PX.