2022 PRODUCTS CATALOG - INDUSTRIAL HOSE, COUPLINGS AND EQUIPMENT

PIPE THREAD USAGE There are several terms or abbreviations which have come into common use for denoting pipe threads. Some of these are: ■ Iron Pipe Threads ■ IPT ■ Tapered IPT ■ Straight IPT ■ IP—S ■ IP-T ■ NPT These may be satisfactory for general reference, but since there are several types of pipe thread, it is best to use the notations as given by a recognized standard (ANSI B2.1). The types in this standard which are used with industrial hose couplings are listed later in this section. Compatibility of threads and method of sealing determine which type of thread is to be used. An NPT male and female form a pressure-tight joint, and usually some type of sealing compound is placed on the threads. NPTF threads are similar in that the seal is made by tight fit between the threads. However the fit is close enough that a sealing compound is not needed. NPSM threads are used for either male or female fittings, but the seal is formed by compressing a packing or by metal contact between chamfers on the male and female. Size range is from 1/4” through 6” nominal pipe I.D. NPSH threads are similar to NPSM threads but are used mostly for fire hose or special couplings. Size range is from 1/2” through 2” nominal pipe I.D. The seal is made by compressing packing. GHT, garden hose threads, are a form of NPSH threads used on water hose. There is only one basic size of thread, 3/4 – 11-1/2. It is not compatible with 3/4-14NPT, NPSH or NPSM threads. Couplings which come in sets usually have a female with NPSM threads and washer; and a male with NPT or NPSM threads. Long shank couplings and pin lug couplings are examples where the male has NPSM threads. Reusable petroleum couplings are examples of sets in which the male has NPT threads. Standard brass inserts have NPTF males and solid females and NPSM swivel females. The seal is made by contact of chamfers or tight fit of threads. Couplings for hydraulic hose have threads which may conform to the above descriptions. In addition, there are many other types peculiar to the hydraulic field. For a complete description of threads, identification, sizes, methods of sealing and other related data, see Hydraulic Hose Catalog #35093. FEMALE MALE NPT (Thread Seal) NPT NPTF NPTF (Thread Seal) NPTF (DrySeal) NPT NPSM (Washer Seal) NPT NPTF NPSM NPSM (Mechanical Seal) NPT NPTF NPSH (Washer Seal) NPSH NPT GHT (Washer Seal) GHT COMBINATIONS OF PIPE THREADS THAT ARE COMPATIBLE: . COUPLINGS AND FERRULES www.gates.com 193 AGRICULTURE AIR BREATHING AIR DUCT AIR AND MULTI- PURPOSE CHEMICAL FOOD AND BEVERAGE ENGINE AND MARINE MATERIAL HANDLING MINING OILFIELD PETROLEUM PRESSURE WASH AND WASHDOWN STEAM WATER CLAMPS COUPLINGS AND FERRULES HOSE FINDER CHEMICAL RESISTANCE TABLE