Cable Gland thread types and what the purpose is of each
Why does Thread Type Matter? – When it comes to cord grips, cable glands and strain relief fittings, choosing the right thread type for the job makes all the difference. The success of your application relies on proper installation which is why choosing the correct thread is so important.
Factors to consider when choosing a thread type
All thread types have their own advantages, uses and locations they originated in. The locational origins of these styles still affect what is used with the exception of Metric. Metric originated in Europe and is used worldwide as the standard. While the other styles, NPT, and PG are directly affected by the location of origin. An applications threading may also need to have elongated threads meaning additional thread length is required to mount through a piece of equipment or enclosure. NPT, PG and Metric are the most common styles of threads, and Sealcon products ae available in all 3 configurations. For an in-depth description and guide to all our styles please download our FREE Guide to Choosing Thread Types.
NPT vs Metric vs PG (a sample of our guide)
NPT stands for National Pipe Thread and is the US standard for tapered threads for connectors and fittings. NPT threads are usually longer than Metric or PG and taper toward the end. The taper rate for all NPT threads is 1/16. NPT threads are designed to create a liquid-tight seal upon tightening. The flanks of the threads compress against each other which allow them to form a seal when torque is applied.
NPT threads are used in a wide range of materials to suit a variety of environments and conditions and are most commonly used on products in the United States. You would want to use NPT threads in applications that require an effective seal from liquids, gases, and steam.
Even though Metric threads are European, they are the most common thread type used world-wide. Metric threads are characterized by their major diameter and pitch, both expressed in millimeters. For example, an M20 x 1.5 fitting has a major diameter of 20mm and a pitch of 1.5mm. You would want to use Metric threads in export equipment or on projects that could be used in many locations world wide.
PG stands for Panzer-Gewinde and is an older German thread type. PG threads are straight threads designed with a smaller thread depth and larger flank angle. The 80° angle of the PG thread gives a shorter profile than the more common 60° angle found in Metric threads.
In our Thread Guide we walk you thru Straight vs Tapered threads and how to calculate the number of TPI or threads per inch.
Download our FREE Guide to Choosing Thread Types
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