Hydraulic thread question - what type?

[timsch]

I need an adapter to connect a 3/8" hydraulic return line to one of the return ports on my L275 shown below. I pulled the plug (gasketed, straight thread) for that port and took it to a local shop that makes hydraulic hoses, but they couldn't match the thread. I tried looking up PS 3/8 thread but found nothing that matched that designation. OD of the thread is ~0.645" & ~0.051" pitch.

The image below is described as a 3/8 Male BOSS

While this one is described as 3/8 JIC

Both are listed as hydraulic fittings.

Is there an equivalent thread for the PS 3/8 shown above?

 

[North Idaho Wolfman]

BSPP or O-ring boss fitting

Pull plug and measure and compare to this:

https://www.discounthydraulichose.com/mm5/thread_guide.pdf

 

[TheOldHokie]

I need an adapter to connect a 3/8" hydraulic return line to one of the return ports on my L275 shown below. I pulled the plug (gasketed, straight thread) for that port and took it to a local shop that makes hydraulic hoses, but they couldn't match the thread. I tried looking up PS 3/8 thread but found nothing that matched that designation. OD of the thread is ~0.645" & ~0.051" pitch.

View attachment 102806

The image below is described as a 3/8 Male BOSS

View attachment 102808

While this one is described as 3/8 JIC

View attachment 102809

Both are listed as hydraulic fittings.

Is there an equivalent thread for the PS 3/8 shown above?

Technically (BS-21) PS (obsolete) is the Rs variant of BSPP

Rs = external parallel thread for fits made on machined face per BS-21 Appendix C.

Most hydraulic shops/suppliers will know that as G thread or simply BSPP. You want a gasketed/bonded G thread port adapter. Something like this:

9002-06-04 | 3/8" JIC Male x 1/4" BSPP Male

Check out the deal on 9002-06-04 | 3/8" JIC Male x 1/4" BSPP Male at DiscountHydraulicHose.com

www.discounthydraulichose.com

The hydraulic shop should not have had any problem ID'ing it.....

Dan