Applied Product Catalog 2017 2018 Page 863 Hydraulic Products

863 Hydraulic Products All Things Industrial SM Pipe Fittings Pipe fittings, also referred to as NPT or NPTF fittings, have tapered threads that create metal-to-metal seals on the threads. A quality sealant (such as Loctite 545) is recommended to provide a seal. Steel pipe fittings are widely used on low-pressure hydraulic systems, and are available in a wide variety of configurations. FITTING IDENTIFICATION Fitting Thread Size Comparison Chart The male connections have (Male unified thread class 2 fit) UN-2A specification threads and the female connections have (Female unified thread class 2 fit) UN-2B specification threads. The exceptions are male and female pipe threads. Tube Fittings There are four basic types of tube fittings: Flare, Flareless, Straight Thread O-Ring and Flat Face O-Ring Seal (FOR-SEAL ). Tube fittings seal in two ways. Flare and Flareless fittings use metal to metal contact joints. Straight Thread O-Ring and Flat Face O-Ring fittings use a rubber o-ring. Where extreme vibration is present, use Flareless, Straight Thread or Flat Face O-Ring Seal fittings. SIZING: For accuracy, it is recommended the male thread be measured. Measure the outside diameter. For our example, use size measures 7/16-20. Refer to the thread chart on this page for appropriate tube size and illustration. Pipe Fittings The American Society of Automotive Engineers, in cooperation with industry, set up a standard for improvement in pipe threads. This improvement is known as the Dryseal Pipe Thread. All Weatherhead pipe threads are American Standard Taper Dryseal Pipe Threads (NPTF). The metal-to-metal seal is formed by contact at the thread crest and root. Nominal pipe sizes do not agree with either the I.D., O.D. or thread sizes. To determine pipe size (up to 1 1/4), measure the diameter of the threads and subtract 1/4. For example, subtract 1/4 from a 1 pipe to obtain the nominal pipe size of 3/4. Pipe sizes can also be given in dash numbers. A dash number is always the numerator of an inch over 16th. For instance, if the pipe O.D. measures 1/2 that would be converted to 16ths (8/16), but be written as -8. SIZE (in) PIPE FOR-SEAL 37 FLARE FLARE-TWIN ERMETO 7000 SERIES STRAIGHT THREAD O-RING SAE 45 FLARE INVERTED FLARE 1/8 1/8-27 5/16-24 5/16-28 3/16 3/8-24 3/8-24 1/4 1/4-18 9/16-18 7/16-20 7/16-24 5/16 1/2-20 1/2-20 3/8 3/8-18 11/16-16 9/16-18 5/8-18 5/8-18 7/16 11/16-16 11/16-18 1/2 1/2-14 13/16-16 3/4-16 3/4-18 5/8 1-14 7/8-14 7/8-18 3/4 3/4-14 1-3/16-12 1-1/16-12 1-1/16-14 1-1/16-16 7/8 1-3/16-12 1-3/16-16 1 1-11-1/2 1-7/16-12 1-5/16-12 1-5/16-16 1 1/4 1-1/4-11-1/2 1-11/16-12 1-5/8-12 1 1/2 1-1/2-11-1/2 2-12 1-7/8-12 2 2-11-1/2 2-1/2-12 2 1/2 2-1/2-8 3-12 3 3-8 3-1/2-12 1 / 1 4 / " 3 / 3 8 / " 1 / 1 2 / "

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