Aerospace Locking Wire

Safety Lock Wire: simple, effective failsafe technology

Safety across a range of industries is of paramount importance, and there are a number of failsafe technologies that add additional layers of security.

Particularly within the aerospace, marine, automotive and industrial sectors where wear and tear, vibration and corrosion can cause failures, the use of Safety Lock Wire can prevent fasteners from shaking loose or falling out.

Safety lock wire can also act as a visual indicator that fasteners have been properly checked and tightened.

 

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What is Safety Lock Wire?  

Locking wire (safety lock wire) is a soft annealed wire used to secure nuts, bolts and components which are subject to vibration and/or a critical environment.

The wire, made of malleable stainless steel alloy, is passed through small holes on the fastener, looped back on itself and fixed to an anchor point (which can be another fastener).

Twisting the Safety Lock Wire creates tension on this fixed loop which prevents the fasteners from shaking loose and falling out.

Tips on using Safety Lock Wire correctly

  • Before applying the safety wiring, you should first tighten the nut or bolt to its correct tension. If possible, align the holes through which the safety wire will be passed, however do not align these at the expense of tensioning the fasteners incorrectly
  • Safety Lock Wire should always be installed so that the fastener tightens itself. In other words, the safety wiring should pull the head of the nut or bolt in a tightening direction once secured to the anchor point.
  • Don't overstress the safety wiring by overwinding it – this could cause it to fail, rendering it useless as a failsafe technology.
  • Once the safety wire has been installed, you should always clip ends off at least 4 to 6 turns after the loop.

Ensure you get the highest quality Safety Lock Wire for the correct application

We supply the wire on ½ or 1 kg spools, in handy ½ kg plastic tubs, or in coil. Standard sizes are available from stock, and non-standard sizes are produced on request.

Primary materials are stainless steel 304 and 316 and 321, Monel (Alloy 400), Inconel (Alloy 600) and Copper.

Materials are typically produced to the following international specifications:

  • DTD189A
  • MS20995C, QQ-W-423
  • MS20995NC, QQ-W-281
  • MS20995N, QQ-W-390
  • MS20995Cu, QQ-W-343F