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Mastiff 400/35 Double Swing Gate Opener

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Heavy Duty Double Swing Opener. Regular arm length.


$1,399.00 incl GST

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Mastiff 400 Swing Gate Operator for DOUBLE gates

Regular arm length - 350mm stroke. Able to push a 4m steel gate weighing up to 350kgs with a peak thrust of 3500N.


  • 2 x 24v Actuator Motors with Aluminium casing and Stainless Ram
  • Standard Mounting Brackets
  • CB17 Outdoor Control Box with control board, built-in RF receiver/antenna and external cable glands.
  • Stand-alone Transformer
  • 3 x TM3 Transmitters
  • 1 x set of 24v backup Batteries.
  • 1 x Outdoor Wireless Keypad.
  • 1 x Gate Metal Stopper for the centre of your driveway with concrete bolts
  • Instruction Manual

Fully closed length between centres of bracket pivot pins: 795 mm

Fully open length between centres of bracket pivot pins: 1155mm (Only use 1135mm max for setup allowing for 20mm spare giving a 330mm true stroke length)

This model requires the gate stop (included) to be installed in the centre of your driveway for the gates to make contact with when fully closed. 

NOTE: If your posts are more than 200mm wide, you will not be able to hinge the gates in the centre of the posts; they should then be hinged towards the inside property edge of the posts, no more than 100mm in from the post corner.

The Mastiff arms also have a keyed release mechanism in them to allow manual movement if ever required (and is used during install):


System Power24v
Number of Remotes Included3
Keypad IncludedYes - Wireless
Warranty12 months 'back to base'