Quick Connects, Skid Steer vs Kubota

[Discount Hydraulic Hose]

I forgot to mention...

Your skidsteer couplers have an SAE thread on the back end. The couplers on your tractor have an NPTF thread. If you're going to convert one to the other, you need couplers that mate with your existing couplers, and the same threads as the ones you are replacing.

Should you decide to pull off the H4-63 couplers, and switch them with flush-face couplers to mate with the ones your skidsteer, you'll need skidsteer couplers with NPTF thread, not the SAE thread that's on the ones you have now.

In that case, I would suggest you buy 4HTF4-HT4F4, a matched set (1 male, 1 female) of flush-face skidsteer couplers with NPTF thread. You can get this set for $47.50 on our web site.

 

[avc8130]

Ken,

I appreciate the help! I think I am going to go with the flush face connectors like the skid steer has. That seems more "universal" for a FEL 3rd function.

I did some internet searching on the different pipe thread types. From what I could find the NPTF and NPSF should be compatible when used with sealant. Is this not true?

ac

 

[J_J]

NPSF is a dry seal thread.

National Pipe Straight Fuel NPSF

http://www.google.com/url?sa=t&sour...zHTtfVhVw&sig2=UJCQSo4S7EtC-QKWXkM60g&cad=rja

A variation of the Dryseal thread is the NPSF
(National Pipe Straight Fuel). It is used for
internal threads and a NPTF external thread can
be screwed into it to provide a satisfactory
mechanical connection and a hydraulic seal.

 

[avc8130]

NPSF is a dry seal thread.

National Pipe Straight Fuel NPSF

http://www.google.com/url?sa=t&sour...zHTtfVhVw&sig2=UJCQSo4S7EtC-QKWXkM60g&cad=rja

A variation of the Dryseal thread is the NPSF
(National Pipe Straight Fuel). It is used for
internal threads and a NPTF external thread can
be screwed into it to provide a satisfactory
mechanical connection and a hydraulic seal.

So I should be good buying any flush face couplers as tehy will be the female and they will interface just fine with regular pipe thread bulkhead fittings on the machine.

Time to figure out the sizes. I think the skid steer is 1/2" and the tractor is 3/8".
ac

 

[Discount Hydraulic Hose]

I'm not sure if NPSF is an official designation, but NPSM is National Pipe Straight Mechanical. It's a parallel thread with the same pitch as NPT and NPTF. Female Pipe Swivels are NPSM, for example. The seal is internal, and if your NPTF male is has the proper internal chamfer, it will seal with a female NPSM.

As to sizes, I looked up the part numbers you listed before, and both of them were 1/2" couplers. The couplers on the tractor also had 1/2" NPTF thread on them, so the flushface couplers you replace them with should have the same thing, unless you want to mess with additional bushings or adapters.

Fortunately, 1/2" couplers with 1/2" NPTF thread are very common and fairly inexpensive. As I said in my previous message, we offer a pair of 1/2" flushface couplers with 1/2" NPTF thread for less then $50 per set on our web site.

ISO 16028 Flushface Quick Couplings