Aerospace Products Company

123 North Pine Street

Indianapolis, IN 46202


Fax 317.269.1522

Rod End Hardware - Locking Devices

Aircraft Locking Devices are sophisticated mechanical fasteners used in a variety of aerospace applications, including critical flight control and landing gear systems. These parts provide a positive lock to prevent rotation in mechanical linkages or actuator systems while simultaneously allowing for linear adjustment. Locking action is obtained via a keying device that locks a shaft to a keyway in a rod end terminal and is secured by a jam nut that is then attached to the locking device with safety wire. Depicted below is the innovative Double Locking Device (DLD) featuring a secondary lock with an integral screw.

Standard and custom locking devices manufactured and stocked by Aerospace Products Company include:

  • NAS 1193
  • MS 14198
  • MS 14227
  • NAS 513
  • NAS 559
  • AS 81935 (Mil-B-81935/3)
  • EN 2546 (Metric)
  • Numerous OEM proprietary designs

Our firm also produces and stocks the jam nuts used in conjunction with the locking devices including:

  • NAS 509
  • NAS 1423
  • BACN11U

The Boeing BACN11U is a new A-286 nut design with significantly closer tolerances and more stringent testing than the NAS standards. It is intended to immediately replace ALL of the NAS standard nuts on Boeing aircraft.

The NAS 1193 Positive Index Locking Device functions as a washer with a locking tab, but is comprised of two halves with serrations on one side of each. The serrations can allow for very fine linear adjustment of a mating rod end in some applications. Parts are investment castings, material is 17-4 per AMS 5355 or AMS 5343.
Aerospace Products Company manufactures and stocks the entire series of NAS 1193 locking devices, along with similar parts to metric dimensions and special customer designs.

Single washer style locking devices are produced in a wide variety of materials, including 17-4, 15-5, 4130 Alloy and Inconel 718.

The NAS559 design is a locking key that seats in the keyway of the rod end and under the threads of the jam nut. In a typical actuator application the actuator rod is slotted on the end to accept the lug end of the locking key. Thus, the keyway of the rod end and a slot of the actuator piston rod are secured by the key. Finally, a jam nut holds the key securely in place after being properly torqued and correctly safety-wired.

Aerospace Products Company was instrumental in the technical development of these standards, and manufactures and stocks the parts in all the available configurations.

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