Dynatech Engineering Ltd


At Dynatch Engineering, we manufacture and supply secure cable restrictors. Our cable restrictors are available in casement and tilt/turn version or door version, in a range of colours including white, brown, stainless steel and black.

Hold Open Restrictors

We supply hold open restrictors designed to operate in a minimum 12mm air gap. They will hold doors open at up to and above 90° (130° and above if required). Different positioning of the frame/sash parts will give the required hold position.

Our hold open restrictors include:

  • Hold-Open 500mm Restrictor
  • Hold-Open 355mm Restrictor

Slimline Restrictors

Our high-quality slimline restrictors work in air gaps from a minimum of 4mm upwards, the "Slimline Restrictor" is perfect for timber and composite windows and doors. Due to the in-built flexibility in the operating arm, our slimline restrictors will also operate in a 12mm air gap.

Window Restrictors

We supply a comprehensive range of window restrictors ideal for safety purposes.

Our window restrictors range includes:

  • AutoLatch Window Restrictor
  • Laminated Window Restrictor
  • Laminated Window Restrictor
  • Resting Window Restrictor

Finger Bolts

We stock a selection of standard and extended finger bolts suitable for aluminium doors. Our finger bolts are made from stainless steel and are available as an extended button version for double doors.


We provide in-line sashjacks and glass rebate sashjacks to prevent a sash dropping due to moving glazing packers. Our sashjacks ensure the correct fitting of a sash is guaranteed.

Find us on Google

We can be found on google.co.uk

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