How To Tell Buttress Drum Plugs From NPS Drum Plugs?

As for 2 inch plastic plugs

Plastic drums most often have two bungs; a 2″ NPT opening and a coarse 2” buttress thread opening.How To Tell Buttress Drum Plugs From NPS Drum Plugs is an essential issue before installation . If you have no idea on what thread you have on your drums? Here is how you tell the difference between buttress and NPS (NPT )threads.

Tell from Appearance

A easy way to distinguish between NPT and Buttress is by their appearance. Buttress threads have a thread where there the lines are spaced further apart making them look more coarse. So they are sometimes called “coarse threads”. NPT, by contrast, has threads much closer together so they are often referred to as “fine threads”.They are best illustrated in the the following two pictures.

Tell from Functions

  • NPT ,the abbreviation of National (American) Pipe Thread, belongs to the American standard of 60 degree taper Pipe threads .Thread Helix Angle smaller, in favor of the self-locking of the thread, so it is usually used in the place where need to be protected against loosening.
  • In the same lenght ,Buttress/ coarse thread teeth number less than the NPT , the section size of each tooth is bigger, the stress is good, better suited to bear large pulling force and impact force

Tell from Definitions from wiki

  • The buttress thread form, also known as the breech-lock thread form,[1] refers to two different thread profiles. One is a type of lead screw and the other is a type of hydraulic sealing thread form. The lead screw type is often used in machinery and the sealing type is often used in oil fields.In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal.
  • American National Standard Pipe Thread standards, often called national pipe thread standards for short, are U.S. national technical standards for screw threads used on threaded pipes and pipe fittings. They include both tapered and straight thread series for various purposes including rigidity, pressure-tight sealing, or both.
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