To securely restrain prisoners under escort by a) linking 2-wrists together


linking a series of cuffs together by means of a tethering mechanism.


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 an Abloy Protec mechanism which drives ball bearings into recesses in the shackles. The tethering mechanism works by inserting a plunger into a separate spring loaded Abloy Protec mechanism which automatically locks the plunger in place. A key is used to release the plunger.

All locking mechanisms 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. Tethers are automatically locked when the tethering plunger is inserted into the plunger aperture(s). Release of the tether can only be achieved by using a key as described above.


Abloy Protec mechanism affording a very high number of differs and keys unique to this application. Note: The key blank profile is not available on the commercial market.

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.

Additional Features

3 position shackle(s) to accommodate wide range of wrist sizes (see section 7).

Three sizes of 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

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 to denote whether 9 or 10 slider mechanism.
NOTE: Key designed to enter one way round only.

Materials and Finishes

Shackle (castings), shackle ends - Mild steel, chrome plated
Handcuff body, tether body and hinge - Aluminium, anodised black
Magazine caps - Mild steel, nickel plated
Magazine, sliders and keys - Mild steel, nickel plated
Locking balls - Phosphor bronze
Locking plunger - Mild steel, zinc plated and passivated
Loose insert - Aluminium, anodised black
Tether plunger - Stainless steel

Dimensions and weights

Maximum height - 77mm
Maximum width - 55mm
Maximum width (folded) - 28mm
Maximum length - 382mm
Maximum length (folded) - 176mm
Wrist hole sizes - 53 x 79mm (max), 53 x 63mm (mid), 53 x 57mm (min)
(Major and minor axis dimensions of approx eliptical shape formed)

47mm dia = No. 3 insert
47 x 43mm = No.2 insert
47 x 38mm = No.1 insert

Weight (excluding keys) - 1000gms (est)