Inserts, Screw Thread, Helical Coil 19Cr-9.2Ni, Corrosion Resistant Steel, Procurement Specification for
|Publication Date:||1 February 2019|
This specification covers closely-wound helical coil, screw thread inserts made of a corrosion resistant steel formed wire with a chemical composition in accordance with Table 1 an identified under the Unified Numbering System as UNS S30200or UNS S30400 that can be formed by an insert manufacturer to achieve the requirements of this procurement specification. The inner surface of the insert coil, after assembly into a screw thread tapped hole, provides internal threads of standard 60° Unified form.
Primarily to provide hard, wear-resistant internal screw threads in light alloys or nonmetals, to provide the parent tapped material increased shear strength by installing an insert of sufficient length to develop the full load of the bolt, and for salvaging worn or damaged internal threads.