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LD1
Epic Contributor
So does crown forklifts
kennyd
Advertiser
No sealants needed on ORFS either, just a drop of oil smeared on the o-ring is all that’s ever needed on them.
We sell a small bottle of sealant on our website, perfect for small projects where you don’t need a large expensive bottle.
the old grind
Elite Member
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- Mid-Michigan
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- NH T-1520 HST, NH TC33DA HST, Case DX26 HST, .Terramite T5C, . NH L785
Loctite 545 is ok, but I'd rather use 567 (high temp) on hydraulic threads. But the reason tapes/dopes have teflon IS to lubricate threads that are tapered so they can be tightened to an 'interference' fit. (akin to 'shrink' or 'pressed' fit)
As a qualified machinist, I get it when a pipefitter tells me NPT fittings can still leak. Thread roots and crowns are not consistently formed/shaped, so there can be a flow path at the major dia of the female thread or the minor dia of the male thread, among others. But Teflon has no business there. Its slipperyness detracts from actually sealing, and that's why only NPT tapes/dopes contain it and as an assembly aid. As a 'dope' I can imagine it being dissolved by hot oil or similar.
I'm old school enough that I grease vs 'goop' fiber gaskets, spray head gaskets with alum paint or smear anti-seize, and btw I don't use glue on tape.
My 'old ways' still means all caustic, high temp, or fuel (NPTF) fittings get old-fashioned Permatex No 2 Non-Hardening, (read the label) my standard for all fuel, hydro or coolant, quenching, or bluing tank etc 'pipe work'.
Hate to admit I laugh when guys put dope on flared, JIC, or compression fittings. Just messy, it can be. Worst threads I've dealt with in a long time are those on TSC's made-up hoses. I trashed several HFT-quality 12" adjustable wrenches plumbing the FEL added to my JD using 16" johnson bars. I had two of ten connections leak, but had to use a 15" adj and 18" pipe wrench with cheaters to do well on the last half of 'em.
btw, Happiness is having a Parker store 10 min away from your shop.
As a qualified machinist, I get it when a pipefitter tells me NPT fittings can still leak. Thread roots and crowns are not consistently formed/shaped, so there can be a flow path at the major dia of the female thread or the minor dia of the male thread, among others. But Teflon has no business there. Its slipperyness detracts from actually sealing, and that's why only NPT tapes/dopes contain it and as an assembly aid. As a 'dope' I can imagine it being dissolved by hot oil or similar.
I'm old school enough that I grease vs 'goop' fiber gaskets, spray head gaskets with alum paint or smear anti-seize, and btw I don't use glue on tape.
My 'old ways' still means all caustic, high temp, or fuel (NPTF) fittings get old-fashioned Permatex No 2 Non-Hardening, (read the label) my standard for all fuel, hydro or coolant, quenching, or bluing tank etc 'pipe work'.Hate to admit I laugh when guys put dope on flared, JIC, or compression fittings. Just messy, it can be. Worst threads I've dealt with in a long time are those on TSC's made-up hoses. I trashed several HFT-quality 12" adjustable wrenches plumbing the FEL added to my JD using 16" johnson bars. I had two of ten connections leak, but had to use a 15" adj and 18" pipe wrench with cheaters to do well on the last half of 'em.
btw, Happiness is having a Parker store 10 min away from your shop.
mcfarmall
Veteran Member
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- Kubota M5660, Farmall C, JD 260 lawn tractor
Loctite PST pipe sealant or the Loctite hydraulic & pneumatic sealant designed for NPT or NPTF threads. Anybody that perpetuates the lie that "brass pipe threads don't need any sealant" should be flogged.
STORB or anything else with a sealing o-ring or washer gets nothing on the threads and a little grease on the o-ring.
No joke.
STORB or anything else with a sealing o-ring or washer gets nothing on the threads and a little grease on the o-ring.
No joke.
kennyd
Advertiser
Loctite 545 is ok, but I'd rather use 567 (high temp) on hydraulic threads. But the reason tapes/dopes have teflon IS to lubricate threads that are tapered so they can be tightened to an 'interference' fit. (akin to 'shrink' or 'pressed' fit)
As a qualified machinist, I get it when a pipefitter tells me NPT fittings can still leak. Thread roots and crowns are not consistently formed/shaped, so there can be a flow path at the major dia of the female thread or the minor dia of the male thread, among others. But Teflon has no business there. Its slipperyness detracts from actually sealing, and that's why only NPT tapes/dopes contain it and as an assembly aid. As a 'dope' I can imagine it being dissolved by hot oil or similar.
I'm old school enough that I grease vs 'goop' fiber gaskets, spray head gaskets with alum paint or smear anti-seize, and btw I don't use glue on tape.
Hate to admit I laugh when guys put dope on flared, JIC, or compression fittings. Just messy, it can be. Worst threads I've dealt with in a long time are those on TSC's made-up hoses. I trashed several HFT-quality 12" adjustable wrenches plumbing the FEL added to my JD using 16" johnson bars. I had two of ten connections leak, but had to use a 15" adj and 18" pipe wrench with cheaters to do well on the last half of 'em.
btw, Happiness is having a Parker store 10 min away from your shop.
Good stuff.
Another issue I commonly see is when people try to re-use NPT fittings and hose ends over and over, then when they leak try to wrap more tape or load up more pasty whatever is laying around goop on them to try to get them to seal. A NPT fitting should be considered one-time use IMHO, whether it's used in hydraulics, gas or water service.
