Threaded insert / knurled / expanding / brass
15, 16, 18 series SPIROL


  • Type:

    threaded, knurled, expanding

  • Material:


  • Configuration:


  • Applications:

    for plastics

  • Size:

    Min.: 4 mm

    Max.: 12.7 mm


Series 15, Series 16, and Series 18 Expansion Inserts provide permanent, reusable threads for light duty applications. Insertion of the screw expands the Insert pressing the diamond knurl surface into the hole wall. Available in Series 15 (standard), Series 16 (headed) and in Series 18 which is a Reverse Expansion Insert that offers exceptional pull-out resistance when the screw is installed from the non-headed end of the insert.
Expansion Inserts are designed for non-critical applications. Ease of installation, not torque and pull-out resistance, is the primary design criteria. Diamond knurls are a cost-effective solution to increase friction enhancing interference between the insert and the hole wall.


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