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  1. Hitch Pins and Clips
  2. JR Products
  3. Snapper Pin
  4. 5/16 Inch Diameter
  5. 2-1/2 Inch Long
  6. 2-1/2 Inch Span
Coupler Pin - 5/16" x 2-1/2"

Coupler Pin - 5/16" x 2-1/2"

Item # 37201051
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Coupler Pin - 5/16" x 2-1/2" 2-1/2 Inch Long 37201051
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Spring-tensioned, zinc-plated steel snapper pin prevents your trailer's coupler from unlatching and releasing from your hitch ball. Pin measures 5/16" diameter x 2-1/2" usable length. 1-636-306-4830 to order JR Products hitch pins and clips part number 37201051 or order online at Free expert support on all JR Products products. Guaranteed Lowest Price and Fastest Shipping for Coupler Pin - 5/16" x 2-1/2". Hitch Pins and Clips reviews from real customers.
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  • Reviews (7)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

JR Products Hitch Pins and Clips - 37201051

  • Snapper Pin
  • 5/16 Inch Diameter
  • 2-1/2 Inch Long
  • 2-1/2 Inch Span
  • JR Products

Spring-tensioned, zinc-plated steel snapper pin prevents your trailer's coupler from unlatching and releasing from your hitch ball. Pin measures 5/16" diameter x 2-1/2" usable length.


  • Snapper pin prevents your trailer's coupler from unlatching
  • Spring-tensioned design creates a strong hold
  • Zinc-plated steel is corrosion resistant


  • Pin diameter: 5/16"
  • Usable length: 2-1/2"

01051 JR Products Large Coupler Lock Pin - 5/16" Diameter x 2-1/2" Usable Length

Video of Coupler Pin - 5/16" x 2-1/2"

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for JR Products Coupler Pin Review

What's going on neighbor, Adam here with etrailer. Today, we're gonna be taking a look at a coupler pin. So this one is gonna be like some of the other ones that we carry here at etrailer, but this one's gonna be zinc coated. It's going to have a diameter of about 5/16 of an inch. It's gonna be about 2.5" long. So, if you have something connected to your vehicle, whether it is a boat like this, it's gonna have a coupler.

So with this, you need to put that into place just so this lever isn't going to disengage and loosen it around the ball. We have a couple of different types. I definitely like the zinc coated portion of it. I don't necessarily love the fact that we don't have a little tab. So some of the different clips, we're gonna have a little bit of extra metal on the end here.

So this one isn't too difficult to get up, but it doesn't have like a dedicated little spot for your finger. You kind of just have to pull this and call it a day. Another thing that this one does not come with is a chain to connect it to wherever. So I like having the chain just because I lose things a lot, but if you are not like me and you can keep track of stuff a little bit better, this isn't really gonna wander off on you. But at the end of the day, it's just a coupler pin.

You just wanna make sure that the 2.5" long, it's going to be long enough to go completely through. So if you have a latch like this, super thin, this is gonna be plenty good. Just make sure the diameter is going to be anywhere upwards of 5/16 of an inch, as you can see if it's through there, nice and snug. And this thing is not going anywhere. If you do have an easy coupler like this, the diameter is right, but the length isn't.

So when I put it in there, it just comes out to the edge. So it isn't gonna be the right size. So, you do have a couple of like this. We have a longer ones here at etrailer. So definitely go with one of those. And that'll do it for our zinc coated coupler pin..

Customer Reviews

Coupler Pin - 5/16" x 2-1/2" - 37201051

Average Customer Rating:  4.9 out of 5 stars   (7 Customer Reviews)

Spring-tensioned, zinc-plated steel snapper pin prevents your trailer's coupler from unlatching and releasing from your hitch ball. Pin measures 5/16" diameter x 2-1/2" usable length.


Simple but effective piece of mind that all is secure



good product. quick service.






See what our Experts say about this JR Products Hitch Pins and Clips

  • Curt Ball Mount and Hitch Receiver Lock
    Yes, I can confirm that all of those parts do fit together. The Coupler Pin - 5/16" x 2-1/2" item # 37201051 will be loose inside that ball mount though. You will get quite a bit of play. The hole in the Curt Class III Ball Mount with 2-5/16" Ball - 2" Rise or 4" Drop - 7,500 lbs item # C45042 accepts a 5/8" pin. I recommend purchasing a Curt Trailer Hitch Receiver Lock - 2" Hitches - Chrome item # C72KR. This will secure your ball mount inside your hitches receiver and keep it from being...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Adam E
Installed by:
Adam E
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video by:
Chris R
Employee Mike S
Written by:
Mike S

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