Bushing ASME B16.11 – Threaded

Q: What is a thread bushing?
A: A thread bushing, also known as a threaded insert or a threaded bush, is a type of fastener used to create a threaded hole in a material where a threaded fastener can be inserted. It is typically a cylindrical metal or plastic component with internal threads and external features that allow it to be securely fitted into a pre-drilled or pre-tapped hole, providing a threaded surface for mating with screws, bolts, or other threaded fasteners.

Q: What is the standard for threaded bushings?
A: The standard for threaded bushings may vary depending on the specific industry or application. However, there are commonly used standards that define the dimensions, thread sizes, and specifications for threaded bushings. The most widely recognized standard for general-purpose threaded bushings is the American National Standard Institute (ANSI) B1.20.1, which covers pipe threads and related fittings. For specialized applications, specific standards or industry specifications may exist, such as those defined by the International Organization for Standardization (ISO) or the Society of Automotive Engineers (SAE).

Q: What is the difference between an adapter and a bushing?
A: The terms “adapter” and “bushing” are often used interchangeably, but there is a subtle distinction between the two.

An adapter is a device used to connect two different components or systems that are not inherently compatible. It typically consists of two or more different types of connections, such as different thread sizes or different types of interfaces, allowing them to be joined together. Adapters are often used to facilitate the transition between different standards, types, or sizes of components.

On the other hand, a bushing is primarily used to create a threaded hole or reduce the size of an existing threaded hole. It acts as an intermediary component that adapts or converts a larger threaded opening to a smaller threaded opening, enabling the use of smaller fasteners. Bushings are generally focused on adjusting thread sizes or converting between different thread types within a single system or component.

Q: What is a threaded reducing bushing?
A: A threaded reducing bushing is a type of bushing designed to adapt or reduce the size of a threaded hole. It is commonly used when it is necessary to transition from a larger threaded opening to a smaller one. A reducing bushing typically has two different-sized threaded ends, allowing it to be inserted into the larger hole and providing a smaller threaded opening for the use of a smaller fastener or component. This type of bushing is often used in plumbing, electrical, and industrial applications where it is necessary to connect different-sized pipes, conduits, or fittings with varying thread sizes.