Sigma’s engineers have developed and qualified a range of fasteners and self-locking nuts for aerospace applications, offering a complete design, test and approval service for customers.

Our self locking nuts were developed and qualified after our engineers designed and calibrated a finite element model supported by empirical data. These self locking nuts are now produced in a dedicated lean manufacturing cell, delivering significant cost savings for our customers.

Our SigmaLite range of aircraft parts is also home to new versions of the self-locking nuts, along with concept designs for a range of lightweight metallic end fittings, redesigned and manufactured using both traditional and additive manufacturing techniques.


  • Sizes from 3/16” to 1.1/4” pipe OD

  • In house designers & engineers

  • Turnkey project management

  • Accredited to all recognised industry standards