CPI™ / A-LOK® Tube Fittings

Parker CPI™ and A-LOK® Instrumentation Tube Fittings are designed as leak-free connections for process, power and instrumentation applications. These single and two ferrule fittings are manufactured to the highest quality standards and are available in a broad range of sizes, materials and configurations.

Parker CPI™ and A-LOK® Instrumentation Tube Fittings are supplied complete and ready to use. The ferrule(s) swage onto the tube as it moves down the body seat creating a pressure/vacuum-tight seal on both tube and body by the interface pressure and surface finish of mating components. The Parker Suparcase® ferrule (back-ferrule only on A-LOK®) creates a strong mechanical hold on the tube.

Parker CPI™ / A-LOK® tube fittings can be used with a wide variety of tubing materials and a broad range of tube wall thicknesses. CPI™ / A-LOK® seals equally well on both thin wall and heavy wall tubing. Tubing and fitting materials should be selected to be compatible with the fluid media. Due to thermal expansion characteristics and chemical stability, the tubing should be of the same material as the fitting. (The exception is brass fittings and copper tubing).

CPI™ Fittings
CPI™ fittings feature a three piece, single ferrule design to work on all instrument grade tubing. Fittings are coated in Molybdenum Disulfide to prevent galling and provide lubrication. The ferrule is treated with Suparcase® technology to ensure sealing and provide excellent anti-vibration performance. CPI™ fittings’ superior body seat surface finish seals in gases and liquids. These fittings are excellent in high thermo cycling applications.

A-LOK® Fittings
A-LOK® Fittings are an industry standard for all insturment grade tubing. These double ferrule fittings have silver coated threads reduce galling. Back ferrules are treated with Suparcase® technology to provide a strong mechnanical grip on the tube.

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Additional information

Brand

Features

• Fittings for Tube to Male Pipe, Tube to Female Pipe, Tube to Tube Unions, Port Connectors, Tube to Welded Systems and Components.
• Available as standard in Heat Code Traceable, 316 Stainless Steel
• Other materials include Brass, Aluminum, Monel, Hastelloy C® and many more
• Available in combination with a variety of ISO Threaded to Fractional Tube Connectors and ANSI pipe thread configurations
• Do not twist tubing during installation
• Use with wide variety of tubing materials and a broad range of tube wall thicknesses
• Seals equally well on both thin wall and heavy wall tubing
• Secure leakproof joints capable of satisfying high pressure, vacuum and vibration applications
Specifications

Ordering CPI™/A-LOK® Tube Fittings
Parker CPI™ / A-LOK® tube fitting part numbers are constructed using alphanumeric characters to identify the size, style and material of the fitting. Generally, the first portion of the item number is listed on the proceeding product pages (Size, Type and Thread). Material and Options will then be added on to these item numbers. These designators are listed in the reference tables (Fitting Materials and Options). Fittings might not be available in every configuration.

Body Shape: A letter or combination of letters and numbers are used to designate the type of fitting for body designator. (i.e. SBZ or MBT = male branch tee, GBZ or FA = female adapter, etc.) See proceeding pages for fitting types codes. May also be referred to as Body, Style or Shape.

Port Size: Tube and pipe thread sizes are designed by the number of sixteenths of an inch (1/2” tube = 8/16” = 8) (1/4” pipe thread = 4/16” = 4). See Tube End Dimensional Data table for Size designators. Proceeding product pages list sizes for fitting types.
All Straights & Elbows: Call out largest CPI™ / A-LOK® tube end size first followed by the smaller CPI™ / A-LOK® tube end or pipe thread size.

Fractional Tees & Crosses: For drop size tees – first size the run (1 to 2) and then branch (3). Example – the size designator for a male run tee for 3/8” O.D. tube and 1/4” male pipe thread would be 6-4-6. For crosses – first size the run (1 to 2) and then the branch (3 to 4). For tees with all ends the same, use the tube and size before and after the style designator; i.e. 4-4-4 JBZ (CPI™), 4ET4 (A-LOK®).
Thread Types: See Thread Types table in How to Order for designators. Generally designated with first portion of item number.

Sealing: BSP Taper threads require the use of a thread sealant. BSPP threads require a sealing washer. This washer may either be a metal gasket (copper is standard) or a “bonded seal” (elastomer bonded to a metal retaining washer). The BSPP, form “A” requires the use of a bonded seal. The BSPP, form “B” (cutting face) may be used with or without a sealing washer. For applications where the cutting face may not seal or where galling is a potential problem, the use of a washer is suggested.

Examples: The Thread Type Designators have been bolded in the following examples for easy recognition:
• 4-4K FBZ-SS = 1/4” CPI™ tube fitting by 1/4” BSPT pipe thread
• 6-4R RA-SS = 3/8” female NPT by 1/4” BSPP (form A) reducing adapter. A bonded seal should be used with this fitting.
• 6MSC4BR-316 = 3/8” A-LOK® tube fitting by 1/4” BSPP (form B). A copper washer should be used with this fitting.
Materials: Basic Material Type (B=Brass, S=Steel, etc). Parker CPI/A-LOK Tube fittings for special applications, can be furnished in almost every material suitable for machining.

Options: See the Options table for available options and designators. After the complete CPI™/A-LOK® number simply add a “dash” then the suffix for the option.

Special Fittings: Consult the factory. If there is any question as to the fitting desired, particularly for special fitting configurations, it is suggested that a customer print be submitted.

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