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Hydraulic fittings

P

Paint Horse

Member
I ordered a new set of loader bucket cylinders. Ports are listed as 1/2 NPT. I picked up new hydrailic 1/2 Male pipe thread to 1/2 female pipe thread 90 fittings for those ports. I have pipe dope or tape both. My question is, as I'm trying to screw these fittings into the ports, I'm meeting resistence about 3 threads in. I've read that you only need 3.5 to 6 threads engaged, but I'm concerned that if I go any farther than resistence is, I'm going to strip these expensive new cylinders. Help!
 
(quoted from post at 16:38:55 11/24/22) I ordered a new set of loader bucket cylinders. Ports are listed as 1/2 NPT. I picked up new hydrailic 1/2 Male pipe thread to 1/2 female pipe thread 90 fittings for those ports. I have pipe dope or tape both. My question is, as I'm trying to screw these fittings into the ports, I'm meeting resistence about 3 threads in. I've read that you only need 3.5 to 6 threads engaged, but I'm concerned that if I go any farther than resistence is, I'm going to strip these expensive new cylinders. Help!
Click to expand...

What do you call resistance? Turning by hand, no wrench, or all you can turn with a 7/8 combination wrench? When we thread pipe 3 to 3-1/2 full turns (= threads) to where one stops being able to turn a fitting by hand is about right for initial engagement. Then wrench tighten for 2 to 3 more turns, so 6 to 7 turns total is about right.
 
First recommendation would be double checking with the supplier/manufacturer that what you received is actually what the specifications said as in 1/2 inch NPT. Usually by a close look at the threads particularly after a fitting has been screwed in it with some force will tell you if the threads are matching. Do you have another male 1/2 NPT fitting to try to screw it in there to try the fit? Sometimes the actual start and end diameter or lower and upper diameters vary as well as the depth the tap is turned in. So basically the general size of the female hole can vary.
 
maybe the cylinders are ORB ports! very possible. but on the other hand if your screwing them in 3 turns thats about right till u meet resistance. they are tapered threads! pull one out look at the threads if no damage maker tight by givener a couple more turns with a wrench and call it good.
 
Many cylinders have straight thread/o-ring type fittings. Have you absolutely determined that these are not that type? It would be a different thread, straight, and have a definite chamfered seat for the o-ring.
 
Yes, I checked with manufacturer before purchasing the 90 fittings. They said their ports are 1/2 NPT.

Guess I'll do another check with a different coupler.
 
Manufacturer states 1/2 NPT. Just tightened by hand , no wrench, about 3 turns before hitting that resistance. I'm going to try a different coupler just to check.
 
Thanks, I'll check again. Appears straight as I look at it, but could have a slight taper. Problem is, limited stores around here carry couplers, and my current cylinder has a split wiper, and deep scratch in the rod, and is dripping fluid like a river , and need to get it changed tomorrow.
 
(quoted from post at 19:32:25 11/24/22) Manufacturer states 1/2 NPT. Just tightened by hand , no wrench, about 3 turns before hitting that resistance. I'm going to try a different coupler just to check.
Click to expand...

Check another fitting but three turns by hand should be ok. You should get three to four more turns with a wrench. How many turns is not an exact number. Differences in taps and dies, along with wear in them from use will make the point of resistance vary.
 
A port for an oring sealed fitting will have a flat machined area or taper around the port. I am just saying this because a rough area around the port would support the presence of NPT.
 
,

Even using grease on the tap, I wouldn't risk getting chips inside a new cylinder. He said it is turning in three turns/threads by hand, it is deep enough.
 
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