Thread identification and measure SAE Fittings JIC 45°

(Society of Automotive Engineers Thread)

SAE JIC 45°

Indruduction

Flare fittings are a type of compression fitting used with metal tubing, usually soft steel and ductile (soft) copper, though other materials are also used. Tube flaring is considered to be a type of forging operation, and is usually a cold working procedure. During assembly, a flare nut is used to secure the flared tubing's tapered end to the also tapered fitting, producing a pressure-resistant, leak-tight seal. Flared connections offer a high degree of long-term reliability and for this reason are often used in mission-critical and inaccessible locations. 

The tool used to flare tubing consists of a die that grips the tube and a mandrel that is forced into the end of the tube to form the flare by cold working. The most common flare fitting standards in use today are the 45-degree SAE style, and the 37-degree AN style, also used with the JIC system. The AN / JIC style generally has a higher pressure rating for a given size tubing. SAE and AN/JIC fittings are completely incompatible due to the different flare angle. Furthermore, AN fittings (or those complying with subsequent standards) and JIC fittings are not interchangeable for design-controlled applications due to differing quality standards. The refrigeration and air conditioning industry usually uses 45° flare connections while hydraulic hoses are usually 37-1/2° flare connections.

Flared fittings are appropriate alternatives to solder-type joints when the use of an open flame is either not desired or impractical. Copper tube used for propane, LP, or natural gas may use flared brass fittings of single 45°-flare type, according to NFPA 54/ANSI. Z223.1 National Fuel Gas Code. The copper tube types used for water service applications commonly uses a flare to iron pipe connection when connecting to the main or the meter. Many plumbing codes, towns, and water companies require type L copper tubing or HDPE pipe in order to provide water service. All National Model Codes permit the use of flare fitting joints, however, the authority having jurisdiction (AHJ) should be consulted to determine acceptance for a specific application.

SAE 45° Threads Dimensions

Thread and agle Identification

As per all other fittings the thread and angle identification it remains the same like below:

1. Crest	5. Thread flank angle
2. Root	6. Taper angle
3. Flank	7. Male thread OD
4. Pitch (metric)	8. Female thread ID
Male	Female
End Connectionas
1.  Body size 2.  Shoulder 3. Face

 Thread Identification Table JIC 45° Flare

Standard Working Pressure

Commonly used in low-pressure, refrigeration and automotive piping systems, and are frequently constructed of brass and connected to copper tubing.

Note: SAE 45° Flare connectors are identical to JIC 37° Flare connectors, except for the angles of the seats.

For the brass fitting the max. working pressure is 2000Psi max (1/8" only).

Working Temperature

• for brass fittings: from -54°C to +121°C

 Sealing

The seal is made on the 45-degree flare seat. The threads hold the connection mechanically. Only connect male SAE 45 with female SAE 45.

How does a JIC fitting works:

Brass SAE 45° fittings are designed for use on low pressure copper, brass, aluminum or steel tubing. They are most commonly used for fuel equipment, plumbing, gases, refrigeration and vacuum lines. Flare fittings are easy to disassemble and can be reassembled many times with no effect on the seal, however brass is a soft material and susceptible to distortion, cracking, cross threading, etc. when over tightened. See diagram K.1 for more information. As a general guide only, they may have an intermittent temperature range of -65°F to +250°F, however at wide temperature ranges the maximum pressure rating drops significantly.

The all-brass fittings feature a vibration resistant construction that is UL listed and meets SAE J512 and SAE J513 requirements. The metal to metal seal resists mechanical pullout and is designed for high pressure service.

Configuration of JIC Fittings

SAE 45 Flare Fittings Features

• All brass construction
• Resists vibration with use of long nut
• UL listed
• Meets functional requirements of SAE J512 and SAE J513
• Working Pressure: 550 (3/4") to 2000 (1/8") psi
• Temperature Range: -65F to 250F
• Compatible Tubing: Copper, brass, aluminum, welded steel hydraulic

note: Not to be Mistaken for AN (Army Navy) Fittings

Conclusion:

Commonly known as JIC fittings and found in fluid power systems. Use caution when identifying this fitting, as the threads are the same as SAE J512 45-degree in -2, -3, -4, -5, -8 and -10 sizes. The sealing surface angles are different, however.

JIC fittings are also commonly confused with AN (Army Navy) fittings. Although the two are dimensional identical, the AN military standard calls for tighter tolerances and defines all fitting types, where the JIC uses AN specification as the base line for their own standards and covers fewer sizes. For these reasons JIC and AN fittings are not functionally interchangeable and so care needs to be taken to properly identify your connection to create a safe and leak resistant seal.