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Threaded Inserts

A Threaded Insert consists of a sleeve with a female thread that can accept a bolt or other type of threaded fastener. The insert can have different dimensions, be made of different materials, and come in different configurations or tooling. Its design and function is to hold fast in thin or soft materials, making the threaded fastener secure. Although some threading inserts have only one cutting surface, others have multiple cutters so that when one tooth wears out, work can move to a sharp tooth. The threading insert’s shape determines the number of sides and cutting angles.

Common Types of Threaded Inserts, Described According to Shape:

  • Diamond-shaped threading inserts have four sides and two acute angles for thread cutting.
  • Round or circular threading inserts are circular devices used in button mills and radius groove turning. Some are adjustable to employ unused edge portions once part of the edge is worn.
  • Triangular threading inserts have three equal sides and three tips with included angles of 60°. Like other multi-toothed products, they are used with indexable machines.
  • Trigon threading inserts have a modified triangular shape. To allow for higher included angles at the tips, these cutters have bowed sides or intermediate angles on the sides
  • Square threading inserts have square-shaped cutting tips with four equal sides. They are used for precision thread cutting.
  • Rectangular threading inserts have two long sides and short sides. They are used for grooving operations where the short sides contain the actual cutting edge.
  • Pentagon threading inserts have five equal sides and angles for specific types of thread cutting.
  • Hex or hexagonal threading inserts have six sides.
  • Octagon or octagonal threading inserts are eight-sided and typically indexable for complex cutting operations.


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