Trimax UMAX50 Premium Universal ‘Solid Hardened Steel’ Trailer Lock


  • One size fits all (from 1-7/8″, 2″, to 2-5/15″, all coupler types)
  • Key hole cover slides up to seal out dirt and grime
  • Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break.
  • Huge 6 tooth, 3/8″ dual ratchet locking system
  • Hardened 5/8″ 16mm steel shackle

Product Description
Trimax UMAX50 The UMAX50 features a rugged corrosion resistant finish. Provides instant security for your camper, boat or trailer when they are not hooked up to your vehicle. Features 1/2 turn technology that cannot be false locked. For dual force security add a TRIMAX chain or cable secured to an anchor point! Also, add a TRIMAX coupler lever lock for additional protection. Easy Installation. Slide ball up into coupler and replace u-shackle. Fits all of the followi… More >>

Trimax UMAX50 Premium Universal ‘Solid Hardened Steel’ Trailer Lock

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  1. #1 by Famous Amos on April 10, 2010 - 2:12 am

    This is probably an ok lock, but it is not entirely made up of solid hardened steel, making it possible to break, especially in cold weather. However, Amazon was terrific with letting us return the item at their cost, due to the inaccurate description.
    Rating: 3 / 5

  2. #2 by MO on April 10, 2010 - 4:41 am

    Works good. I have a little trouble putting the key in and getting the pins to slide but other than that it works ok.
    Rating: 4 / 5

  3. #3 by Patrick on April 10, 2010 - 5:05 am

    I bought this lock for our horse trailer, which has a standard, fulton-type hitch. It works great. I don’t worry anymore about leaving town and having someone steal the trailer. The only way cut this lock would be to use an acetylene torch and most thieves don’t want to take that much time.
    Rating: 5 / 5

  4. #4 by Gene F on April 10, 2010 - 5:12 am

    I bought the Trimax “Universal” lock only to find it was not universal. When attached to a Brenderup horse trailer’s coupler, it would slide off over the front or simply fall off if the coupler lever was raised. The lock seems to require a groove on the top of the coupler to hold the lock’s top bar-loop. Else, as on my trailer, it will not stay attached. It seems solid and may work for some trailers, but not for all.

    Instead, try the Master Lock Universal Trailer Coupler Lock #377DAT; it worked for me and seems as if it will work for all couplers. Also it’s $18 with free shipping instead of $36 plus $10 shipping for the Trimax.

    That said about this product and it’s inaccurate billing, I am happy with Mobile Mart who refunded my costs and paid for return shipping the lock.
    Rating: 1 / 5