To securely restrain prisoners under escort.

The basic wrist locking unit consistS of a steel shackle sliding in a cast aluminium body similar to an open shackle padlock. When fully extended, the shackle can be made to hinge back to provide access for the wrist. Locking is achieved by rotating the magazine of a conventional AVA mechanism which drives ball bearings into recesses in the shackles. The 1K52 comprises of two such units attached through chain links and a swivel link to provide flexibility of movement.

Principle of operation
Handcuff units are key retaining in the unlocked condition. In use, shackles are closed onto the wrist, the key turned (anti-clockwise) and removed. Release is the reverse of the above procedure.


Standard features

  • 9 or 10 slider AVA mechanism affording a very high number of differs and keys unique to this application viz:-
    The standard version has 9 sliders and a shorter than standard length bit; the special 'H' version has 10 sliders on a standard bit length, but with one thinned down wing - neither blank being available on the commercial market.
    NOTE: 'H' version is identified by step in the conical recess of the magazine cap.
  • False notching and common internal profile on sliders to deter manipulative attack.
  • Key retaining mechanism to ensure that handcuffs cannot be left unlocked with key removed
  • Magazine retaining cap designed to be irremovable short of destroying the body.
  • Deadlocking action and two-point locking on each shackle ensures that each product can withstand a minimum force of 5.0kN.
  • Confusing key profile to deter attempts to sight-read the combination.
  • 3 position shackles to accommodate a wide range of wrist sizes.
  • Smooth finish and absence of sharp corners (particularly around wrist holes) to ensure that handcuffs do not cause injuries, even after long periods of restraint.
  • Identification mark on key ('0' for 10 slider; '9' for 9 slider) which should face towards grubscrew in base when entering key to ensure correct alignment.
    NOTE: Key designed to enter one way round only.

Additional features
Three sizes off loose inserts (available as optional extras) to further reduce the opening for very small wrists. Reductions in normal diameter as follows:-

  • No. 1 - 19.0mm
  • No. 2 - 14.5mm
  • No.3 - 10.0mm


Materials & finishes

  • Shackle (castings), shackle ends and chain links - Mild steel chrome plated
  • Swivel link - Stainless Steel
  • Handcuff body - Investment cast aluminium; anodised and spray painted Black
  • Magazine caps - Mild steel, nickel plated
  • Magazine, sliders and keys - Brass
  • Locking balls - Phosphor bronze
  • Locking plunger - Mild steel, zinc plated and passivated
  • Loose insert - Investment cast aluminium, spray painted Black