45 Degree Flare Half Union

Photo of a 45 Degree Flare Half Union
Fitting Connection Part # 756127
Manufacturer Part # 248X8
Price $3.83 / each
Condition/Availability New, In-Stock, Most Items Ship Within 24 hours

Category Union - Brass & Pipe Fittings
Sub-Category Half Union
Sub-Sub-Category Male Pipe Thread to Flare Half Union (248)
Item Description 45 Degree Flare Half Union
O.D. Tube 1/2
Male Pipe 3/8
Straight Thread 3/4-16
Hex 0.75
Length 1.62
Meets Standard SAE 010102
Material Yellow Brass
Manufacturing Process Extruded


Copper, brass, aluminum, plastic and welded steel hydraulic tubing that can be flared.

Depends on tubing used. Will stand burst pressure of standard tube – up to 5,000 P.S.I. with bundyweld (double flared) and 3,500 P.S.I. with copper tube depending on size.


Good vibration characteristics depending on tubing used.

Approved by Underwriters’ Laboratories No. AU-1344 for hazardous liquid, fuel equipment.
Meets specifications of the Society of Automotive Engineers (S.A.E.) Tube Fittings Standards. 1/8 inch thru 5/8 inch.

Low cost, availability, reusability. Available in long and short nut styles.

Fuel, oil, air, water lines, LP and natural gas lines, hazardous liquids or gaseous chemical not corrosive to tubing material and brass.


Male National Pipe Thread Taper  (NPT) threads are referred to as MPT ('Male Pipe Thread'), MNPT, or NPT(M) for male (external) threads.  An equivalent designation is MIP (Male iron pipe).  NPT is a U.S. standard for tapered threads used on threaded pipes and fittings. In contrast to straight threads that are found on a bolt, a taper thread will pull tight and therefore make a fluid-tight seal.  Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. These threads are now used in materials other than steel and brass, including PTFE,[2] PVC, nylon, bronze and cast iron.

The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide the seal. As the thread body is tapered (0.75 in/ft) a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the crests and roots of the threads because of the taper). This means that NPT fittings should be burr free and lubricated using a lubricating material like lubricating paste or tape. (The use of tape also helps to limit corrosion on the threads, which otherwise can make future disassembly nearly impossible.)
SAE Standard 010102

This part is built to a Society of Automotive Engineers standard SAE 010102.  You can buy a copy of this standard from the American National Standards web store at:


This standard may be important to you is because all manufacturers who reference this standard are expected to be building duplicate parts.  The parts should be interchangeable, no matter the manufacturer: the same length, size, shape, threads, material, etc.  Everything about the parts should be a duplicate. Some Asian (China, India, Pakistan, Taiwan, etc.) parts have claimed to manufacture to this standard, but some parts have been found to be deficient in multiple areas.  The greatest area of deficiency has been materials:  copper, brass, bronze, PVC, etc.  Our brass comes from a USA firm and meets tight standards.  The variability of the brass and the thickness of the part in various areas may be deficient and result in subpar performance.  We offer a version of this part that is the manufacture’s standard.  It is a little shorter and a little thinner than the SAE version, while we still use USA brass, copper, PVC, etc.  We also offer an import version because some buyers prefer a very low price and are willing to take the risk on materials and other variances.