⚠️ For ground-adjustable propellers only. Do not use these washers on Saber prop extensions, crush plates or wooden props. Extension and crush plate installs use the standard washers supplied with our prop bolts.

Genuine Nord-Lock wedge-locking washer pairs: X-Series in 3/8″ and 1/2″, standard Nord-Lock in 7/16″ (Nord-Lock does not make the X-Series in 7/16″). All are Delta Protekt zinc-flake coated. The X-Series is a step up from the standard Nord-Lock washers usually supplied with ground-adjustable props.

Wedge-locking: each pair has cam faces on the inside and serrations on the outside. The cam angle is steeper than the thread pitch, so the bolt cannot back itself out under vibration.
Built-in spring (X-Series only): the X-Series washers are slightly cone-shaped, which keeps clamp load on the joint as parts settle or expand and contract with temperature. That is where they beat standard Nord-Locks.
Coating: Delta Protekt zinc flake (KL100 base coat, VH302GZ top coat), through-hardened steel.
Sizes: 3/8″, 7/16″ and 1/2″ bolts. Sold per washer pair, one pair per bolt.

Installation

Install each pair with the cam faces together and the serrated sides facing the bolt head and the hub.
Nord-Lock recommends lightly lubricating the threads and the area under the bolt head.
Torque to your propeller manufacturer’s specification with a calibrated torque wrench. The prop maker’s torque always takes priority.
Not for wooden mating surfaces, and the surface they bite into must be softer than the washer (standard aluminum hubs are fine).

Reusing washers

Inspect every time you remove them. Nord-Lock does not set a fixed reuse limit; it depends on the clamp load and conditions, so each pair has to be checked before it goes back on.
Replace the pair if the cams are flattened or rounded, the serrations are worn smooth or chipped, or there is any rust, cracking or distortion.
Saber recommends a new pair after 5 installs even if they still look good, or sooner if anything looks worn. Always replace both washers of a pair together.
Reinstall cam face to cam face with the serrations facing out.

Not sure what you need? Call (817) 326-6293.

Extension Hardware

Constant-Speed Extension O-Ring (Hartzell C-3317-228)

Nord-Lock Wedge-Locking Washers – Ground-Adjustable Props Only