Asked by: Jaafar Chellappan
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How do you tighten a JIC fitting?

Last Updated: 5th June, 2020

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THE “FLATS” TIGHTENING METHOD FOR JIC
  1. Tighten the nut by hand until it bottoms the seats.
  2. Using a marker, draw a line lengthwise on the nut and extend it onto the adapter.
  3. Using a wrench, rotate the nut to tighten. Turn the nut the amount shown on the chart.

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Similarly, you may ask, how do you tighten hydraulic fittings?

JIC fittings should be tightened by hand only until the two connecting surfaces meet. Then, fittings should be tightened with the use of two wrenches to the required number of flats. A “flat” is equal to a one-sixth rotation. To determine the required number of flats, refer to the fitting manufacturer's manual.

Beside above, how do you tighten NPT fittings? NPT fittings taper for a tighter fit.

  1. Insert the male thread into the female fitting.
  2. Turn the male pipe thread in a clockwise direction.
  3. Continue to turn the male pipe fitting in a clockwise direction until you can no longer do so, approximately two to four full revolutions depending on the size and type of fitting.

Considering this, can you over tighten an fittings?

Over-tightening can damage the fitting or the seal. That said, you should take care to tighten only to the recommended torque. Over-tightening can lead to damaged fittings and/or O-rings, cracked ports and most certainly a compromised connection seal.

What does JIC fitting stand for?

JIC fittings, defined by the SAE J514 and MIL-DTL-18866 standards, are a type of flare fitting machined with a 37-degree flare seating surface. JIC (Joint Industry Council) fittings are widely used in fuel delivery and fluid power applications, especially where high pressure (up to 10,000 psi) is involved.

Related Question Answers

Arabel Paggel

Professional

Can you over tighten pipe threads?

Over-tightening the connection can easily split the female portion of a pipe thread connection; this is especially an issue when installing male pipe thread fittings into cast iron ports on valves, motors, and cylinders. Using a liquid thread sealant for NPT connections is recommended over using Teflon tape.

Ramzi Swarte

Professional

How tight should flare fittings be?

9) Connect to the fitting: Hold the flared end on the fitting, and tighten the nut. Make it snug, but don't over-tighten. You can snug it up more if an air test reveals a leak.

Shawnta Arboli

Professional

What happens if a hydraulic system leaks?

One reason that hydraulic systems still leak excessively is that most of these systems continue to operate even after a leak occurs. Over-tightening a hydraulic fitting can crack the fitting and damage the seal, creating an even bigger problem. Contamination of hydraulic fluid is another problem that can cause leaks.

Zouhair Schleeweiss

Explainer

Do hydraulic fittings need Teflon tape?

You don't need or should use any teflon tape or pipe dope on hydraulic fittings. Neither are designed for those kinds of pressures and using them could create a less then perfect mating between connection surfaces causing more harm than good.

Lal Merlino

Explainer

How do you stop a hydraulic thread from leaking?

Here's what not to do when you find a hydraulic fitting leak and why.
  1. Don't use your hand to check for leaks.
  2. Don't just torque (tighten).
  3. Don't leave the system pressurized.
  4. Don't replace with a different fitting type to save time/money.
  5. Don't always blame the fitting.
  6. Don't reuse an O-ring.

Mamoudou Truve

Explainer

How do you seal hydraulic fittings?

The only thread sealing material they recommend being used was LocTite thread sealer with teflon. The teflon is used to lubricate the two metal surfaces because of the interference fit of an NPT fitting. Teflon tape was never to be used on a hydraulic system.

Yves Babayants

Pundit

ARE AN and JIC fittings interchangeable?

It's important to note that the AN and JIC specifications are no longer in existence in most cases. The majority of the hydraulic population agrees, the JIC (or SAE) 37 degree fittings are generally interchangeable with AN fittings.

Luigia Kleinekathofer

Pundit

How do you tighten a fitting without scratching it?

How to Tighten Chrome Fittings
  1. Wrap the fitting with a protective cover. You can use anything that will prevent scratches, such as a bit of cloth, duct tape or electrical tape.
  2. Open up your adjustable wrench so there is plenty of room for the fitting.
  3. Turn the wrench carefully to tighten the fitting.
  4. Remove the protective covering.

Patrizia Lazzeri

Pundit

How tight should water supply lines be?

One of the biggest problems when swapping out water supply lines is knowing how tight the connections should be. Obviously this is important to prevent water leaks. Most directions say to hand tighten then use a wrench for the last 1/4 to 1/2 turn.

Hongfen Linda

Teacher

Should you use Teflon tape on NPT fittings?

NPT threads are designed to be used with a sealing compound such as Teflon tape to create a leak-free seal, whereas NPTF threads form a mechanical seal by crushing the entire thread form. If NPT is used without a sealing compound then there can be leakages or other unpleasant issues.

Jenica Uzal

Teacher

Are NPT threads self sealing?

NPT connection
20.1´. This taper thread is a United States thread for self-sealing standard pipe connections. NPT (National Pipe Thread) connections are the most frequently used types of connection in the USA and Canada. NPT connections have a taper thread, which keys into the female NPT adapter.

Missoum Schweighart

Teacher

How do you seal NPT fittings?

Clean any grit off the threads and apply a thread sealant. Because NPT fittings seal at the threads instead of at a flare or at the hex, thread sealant is the only type of gasket you can use. We at Pegasus recommend a liquid or paste sealant such as Loctite PST 565 Thread Sealant instead of plumber's tape.

Farhana Vaget

Reviewer

Will a small water leak seal itself?

No matter how small a pipe leak is, you don't want water pouring out into your home. Unaddressed leaks tend to grow, too, so small problems won't stay small for long. You apply epoxy directly onto the leaking pipe, like you would with caulk or plumber's putty. The epoxy will temporarily form a seal over the leak.

Brigit Prot

Reviewer

Can you reuse NPT fittings?

Though the same function does not happen with NPT fittings, it is not recommended that NPT fittings be reused. Overtightening is common, particularly when a fitting is reused, which can cause galling or increase the likelihood of leakage.

Shuangfen Tulaikin

Reviewer

Do NPT fittings need sealant?

"NPT" threads do require sealant or tape. I find that the teflon based liquid sealant works better than the teflon tape. "AN" fittings should require nothing as they seal metal to metal based on slight angle differences.

Goiatz Almudi

Reviewer

How tight should gas fittings be?

There is no specific torque or other fixed installation technique. Use tape dope, tighten to hand tight, 2-3 more turns and leak test the bloody thing. According to this reference, the pipe should be in the fitting 9/16" for 3/4 NPT threads. This one states 0.400 inches for hand tight and 0.5457 for maximum.

Lupicinia Rementsov

Supporter

Do I use Teflon tape on pipe threads?

Plumber's tape, often called Teflon tape, helps you get a watertight seal on threaded pipe joints. It also helps lubricate the connection, making the threading a bit smoother, and it helps to prevent pipes from sticking when you want to disassemble the joint.

Fiz Litwack

Supporter

What size is #4 JIC?

JIC 37° Flare & Uno (O Ring Boss) Threads
MALE THREAD OD & PITCH DASH SIZE TUBESIZE
1/2 – 20 UNF -08 5/16
9/16 – 18 UNF -09 3/8
3/4 – 16 UNF -12 1/2
7/8 – 14 UNF -14 5/8

Ranulfo Clusellas

Beginner

What size is #6 JIC fitting?

JIC 37° Flare (SAE J514)
Inch size Dash size Thread Size
38 -6 916 - 18
12 -8 34 - 16
58 -10 78 - 14
34 -12 1 116 - 12