The pit stop usa difference were the experts we help you find a way to win. Npt fitting sizing does not refer to the physical dimension of the threads.
Npsm Pipe Thread Ansi B 1 20 1 1983 R1992
An fitting thread pitch. Male threads are inserted into female threads. Typical layout for expansion joints. These are the same thread sizes that have been used in aircraft and industrial applications for many years. Pitch can be expressed in both threads per inch as well as in millimeters. Pitch identification is reliant on the specific thread standard such as npt iso bspt etc. After measuring the diameter of your threads determine their spacing in threads per inch.
Thread size chart for an fittings. Click above to shop all fittings or try our search function in the top right corner. Pitch refers to the distance between the threads. In the case of metric connections measure the thread to thread distances. For some odd reason the automotive industry wants to make an fittings sound like something special. Huge selection over 100000 products from the top performance brands.
Youll typically see metric fastenersfittings described as something like m16 x 15 in which m16 refers to the diameter of the fastener and the 15 refers to the thread pitch. Mixing them can cause leakage at the flare. For example an6 bolt has a 38 24 thread whereas an an6 fitting has a 916 18 thread. Sae j518 code 61 and code 62 4 bolt flanges. Npt threads are tapered to create an interference fit and often use thread tape or thread sealant to form a liquid tight seal without the use of crush washers o rings or gaskets. Each an size number has its own standard thread size which can be seen in column three of the chart.
The chart to the right will clarify this point. Male threads project on the outside of the fitting while female threads are found on the inside of the fitting. You must measure carefully to be sure. Record the values and compare your measurements with the figures provided in this guide. The thread pitch on these metric sizes are also quite close to the thread pitch of some sae sizes 10mm 254 tpi 125mm 203 tpi 15mm 169 tpi 2mm 127 tpi. The sizing chart is in reference to the inside diameter of a schedule 40 black iron pipe.
To get an accurate value ensure that the thread pitch gauge is fitting well on the threads. Each an size number has its own standard thread size see column three of the chart. Fitting thread size chart the following chart is intended as a quick reference guide for thread size by dash size. Again these are the same thread sizes that have been used in aircraft and industrial applications for many years. Use this handy chart to determine the an fitting size based on corresponding thread sizes. Male and female threads refer to the placement of the threads on your fitting.
Note that 37 an and 45 sae fittings and tooling are not interchangeable due to the different flaring angles.
Gallery of An Fitting Thread Pitch
