Saracen Ultra FHL400 manual

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Parts identification & fitting diagram.


The FullStop® Saracen Ultra Hitch Lock can be fitted when your vehicle is hitched or unhitched, but should never be fitted during transit. It is against the law in the UK to tow whilst using a Hitch Lock.

Fitting when hitched

Insert key (5) into Male Lock Portion (3), push and turn 90° clockwise to unlock.

If a stabiliser is fitted, lift the handle to the vertical position.

Position the Main Body (1) over the hitch handle ensuring the handle end is recessed fully into the enclosed end of the Main Body (1). Fit the Base Section (2) onto the bottom of the Main Body ensuring the holes line up with each other. Slide the Female Lock Portion (4) through all the holes.

Insert the Male Lock Portion (3) into the Female Lock Portion (4) and turn 90° anti-clockwise to lock. 

Fit the protective Lock Cap (7).

If a stabiliser is fitted its handle may be pushed back down into position over the hitch lock.

Fitting when un-hitched

Installation of the Saracen Hitch Lock when fitting onto an unhitched caravan, is identical except that the included Security Ball (6) must be inserted into your coupling to inhibit the caravan being hitched onto a vehicle.


It is highly recommended that a secondary security device (such as a wheel clamp) should be used to inhibit theft by some unconventional form of towing. Visit 

Explore the entire Fullstop range here


Fit protective Lock Cap (10) over the Shield Plate (1) to help prevent ingress of dirt or water.

Grease the lock face and ball bearings before first use, with a light oil such as 3-IN-ONE or equivalent.

Thereafter spray any moving parts of the lock body with a light oil such as 3-IN-ONE or equivalent every eight weeks.


Please store your keys in a safe place and remember to register your product.

Please register within 14 days of purchase. Please retain your original purchase receipt.


The following spare parts are available to purchase:

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