Master Lock 375DAT Class III/IV Snap-On Receiver Hitch Lock with 5/8-Inch Pin

by Master Lock

Product Features

• Trailer-hitch lock with 5/8-inch pin
• Locks boat trailers, utility trailers, camper trailers, and more onto hitch
• Precision tumbler mechanism resists picking; Class III/IV
• Sealed stainless steel body resists corrosion; solid brass cylinder cores and cases
• Fits 2-inch, square receiver tubes; accepts K1 key blank; limited lifetime warranty

Product Details

• Shipping Weight: 12 ounces
• Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
• ASIN: B00004SQM4
• California residents: Click here for Proposition 65 warning.
• Item model number: 375DAT
• Average Customer Review: 3.1 out of 5 stars  See all reviews (25 customer reviews)
• Amazon Best Sellers Rank: #39,152 in Automotive (See Top 100 in Automotive)
  • #62 in Automotive > Exterior Accessories > Towing Products & Winches > Hitch Accessories > Hitch Locks
• Discontinued by manufacturer: Yes

Product Description

Amazon.com Product Description

Keep that unattended trailer locked and secure with this snap-on hitch lock from Master Lock. The unit features a 5/8-inch, bent pin that slides into the trailer's receiver tubes with ease. The pin attaches to the lock so it can't be removed without one of the two included keys. Fitting 2-inch square receiver tubes, the lock is protected from the elements by Master Lock's Weather Tough seal for years of reliable trailer security. A stainless steel body and solid brass cylinder core resist corrosion for smooth operation and optimal security. And, an attached, plastic lock cover keeps moisture and road debris out of the keyhole for added protection. This Class III/IV lock also features a precision pin tumbler mechanism that resists picking. The unit accepts K1 key blanks for making additional keys. --Brian D. Olson

What's in the Box
Lock, two keys

Customer Reviews

Most Helpful Customer Reviews

27 of 27 people found the following review helpful:

5.0 out of 5 stars Master Lock 375DAT Snap on Receiver Hitch Lock w/ 5/8"Pin, August 21, 2001

By 

M. Peterson "mozero" (Lakeville, MN) - See all my reviews
(REAL NAME)   

This review is from: Master Lock 375DAT Class III/IV Snap-On Receiver Hitch Lock with 5/8-Inch Pin (Tools & Home Improvement)

After spending more than I care to mention on a bike rack and a hitch-mounted storage rack I felt I needed to protect them with a hitch lock. The Master Lock 375DAT is for a 2" receiver and replaces a 5/8" pin. I looked at a few bike and hardware stores and found it to be competitively priced on Amazon. It also appeared to be of better quality and lower price than some others I found at a hitch store as well. In assessing the lock I wanted to see how well it performed in three apsects: 1) Fit and ease of putting through the hitch pin opening 2) Ease of locking and opening with hitch attachments on; and 3) Did it make any noise or rattle.

Overall I was more than pleased with the lock. 1) With regard to placement I was pleasantly surprised to find that it slid through my slightly rusty receiver hitch better than any of my existing pins. I think this was because it is a better quality SST than my other pins. I also found the locking mechanism to be easier to lock in place than the conventional pin. Since the locking head is symmetrical I did not have to worry about getting the hole lined up just perfect to insert a cotter pin (also minimized knuckle scraps). 2) It was also easier to mount my storage rack attachment since you approach the lock from the side rather than having to address the cotter pin through the attachment. I had also intended to use with my bike rack which is held in place with a bolt. I forgot the bolt is held in place with a nut welded to the inside of the receiver tube so the lock is unable to go through. Not the fault of the lock, just disappointing that I either have to keep using the bolt or somehow remove to enable the lock to pass through. 3) I was a little concerned that there was some play in the lock and that it might create some noise. The play I noticed helps engage the key in the lock and does not appear to be a problem.

My only complaint is that I wish Amazon carried a version for my other car that has a 1 1/4" receiver which needs a 1/2" pin!

8 of 8 people found the following review helpful:

5.0 out of 5 stars Master Lock 375DAT Snap on Receiver Hitch Lock, March 10, 2006

By 

John Kelly (Greensboro, NC United States) - See all my reviews
(REAL NAME)   

This review is from: Master Lock 375DAT Class III/IV Snap-On Receiver Hitch Lock with 5/8-Inch Pin (Tools & Home Improvement)

Real nice product. I like the heavy rubber end that covers the lock. Sometimes on these locking bolts, they don't offer a seal on the lock and over time the lock rusts and is hard to work with. Being at the back of the truck, it's going to continue to be wet and the seal should keep the lock from not functioning as it should.

7 of 7 people found the following review helpful:

1.0 out of 5 stars Rusted on, April 17, 2008

By 

Matthew M. Sheridan - See all my reviews
(REAL NAME)   

This review is from: Master Lock 375DAT Class III/IV Snap-On Receiver Hitch Lock with 5/8-Inch Pin (Tools & Home Improvement)

After only 4 months, the lock part is rusted on the pin and I can't get it off. Also the key barely fit in the hole, even with the rubber piece protecting it from dirt and grime. The key is now stuck in the lock. Not that it matters, because I have to get the pin cut off anyways. I'd avoid this product.