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Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span

Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span

Item # C21510
Our Price: $8.55
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This 5/8" diameter pin fits 2" and 2-1/2" square receiver hitches. Includes retaining clip. Rubberized, plastic-coated ends give you a secure grip for easy installation and removal. Zinc finish resists corrosion. 1-800-940-8924 to order CURT hitch pins and clips part number C21510 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span. Hitch Pins and Clips reviews from real customers.
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  • Reviews (827)
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  • Videos (2)
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CURT Hitch Pins and Clips - C21510

  • Fits 2 Inch Hitch
  • Fits 2-1/2 Inch Hitch
  • Standard Hitch Pin
  • 5/8 Inch Diameter
  • 3-3/16 Inch Span
  • CURT

This 5/8" diameter pin fits 2" and 2-1/2" square receiver hitches. Includes retaining clip. Rubberized, plastic-coated ends give you a secure grip for easy installation and removal. Zinc finish resists corrosion.


  • Hitch pin secures ball mount or other hitch-mounted accessory in your trailer hitch receiver
    • Included clip inserts into end of pin to hold pin in place
  • Sturdy steel construction
  • Corrosion-resistant zinc-plated finish
  • Pin and clip have a rubberized, plastic-coated grip for easy installation and removal


  • Application: 2" x 2" and 2-1/2" x 2-1/2" trailer hitch receivers
  • Pin diameter: 5/8"
  • Usable length (span): 3-3/16"
  • Overall length: 5-1/2"

21510 Curt Pin and Clip For Class III, IV and V Trailer Hitch Receiver with Rubberized Plastic Grip

Video of Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span

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

Video Transcript for Review of Curt Hitch Pins and Clips - Standard Hitch Pin - C21510

Jeff: Hello everybody. This is Jeff at Today, we're going to take a look at this Curt class three, class four and class five hitch pin and clip, that fits two inch and two and a half inch hitch receivers. This hitch pin is what will secure your hitch mounted accessory in your trailer hitch receiver. The pin itself has a nice heat treated steel. It's very strong and durable, has a nice sink finish on it to resist corrosion, and if you notice on the clip and on the pin, it does have plastic grips on the ends right here, and those plastic grips make it easy to install and remove.

Same way on the clip, push it in and pull it out to remove it.A few specs on this. Again, it is designed to fit two inch by two inch and two and a half inch by two and a half inch trailer hitch receivers. The pin diameter is five eighths of an inch. Overall length, if we measure from this end to this end, on the pin itself is going to be right at five and one quarter inches. And the usable length would be once we install the clip and that's from inside the clip to the spot right there where it starts to bend is going to be right at three and one eighths inches for usable length, but that should do it for the review on this Curt class three, class four and class five hitch pin and clip for the two inch and two and a half inch hitch receivers..

Customer Satisfaction Score:

Customer Reviews

Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span - C21510

Average Customer Rating:  4.9 out of 5 stars   (827 Customer Reviews)

This 5/8" diameter pin fits 2" and 2-1/2" square receiver hitches. Includes retaining clip. Rubberized, plastic-coated ends give you a secure grip for easy installation and removal. Zinc finish resists corrosion.


I use this Curt hitch pin and clip when I'm using the receiver plug-even though I COULD use it with my hitch. Being an expensive hitch, I like RH5-XL when it's on my truck. The Curt is better than plain hitch pins because of the rubber on both the pin and the clip, which gives a better grip when it's cold or wet. Etrailer, as usual, got it to me fast, and the price was right. Also, I like that the clip goes through the pin instead of into a slot, making it somewhat harder for the clip to fall out or spread the legs of the clip over time-at least I think so.

Rich G.


Still working like a champ. No rust, a little wear on the pin, but it still works like day 1.


Easiest install ever. Less than 30 minutes. Did not have to remove spare tire. Perfect fit. Good build quality.


You guys think of everything although these items were not needed as I had locking pins available for hooking up the tow system. Might want to ask customer before adding items.

Etrailer Expert

Katrina B.


They should have asked whether you needed that pin or not. I am sorry that this step was missed. We can always set up a return label for you to return it. Let me get you over to customer service and they can discuss with you the best option.


The low profile was the best choice, especially on the Sienna. It was a bit of work since I had to remove the bumper cover and the zillion plastic clips and screws but definitely worth the extra work.


Works great!



After a year, its still working great! A little rusty but the roads get salted around here so its holding up great considering.


I was so excited with the ordering and videos showing details as well as the fast delivery from your firm. However, as of 5:00 today, I did not receive the hitch receiver (main part) and got an email satiating that it will be here on Friday. This puts me in an extremely disadvantage for my move because my installation appointment is on Friday and I make my move this Sunday. Now I am not sure what even to do at this point as the very main part won't be here until the day of my installation!!!!


They are holding up well after 1 year. Seriously what can I say about a pin and clip? They have not broken, they fit, and they do they job I want them to do.


We're thoroughly pleased with both Paula and our order (a tow hitch cover). The cover looks exactly the way it looks on the website!


Although we haven't put the piece on, there are a few reasons why I'm very pleased with the service provided. From the video tutorial, amazing and helpful! The fact that you mentioned the name of the parts needed and included the item# (which was helpful when it came to looking for the piece. Your website is very user-friendly. The arrival of our package was very-well wrapped and I will post my review (or add to my review), once we unbox and put the piece on, which again, the video is helpful again! Thank you very much!


Great product that I have used before!


This was the perfect length for my use. The only other thing I would consider is an anti-rattle pin but I don't haul enough to make it worth the hassle.


It does the job - I've had no problems with it. I had it installed along with the hitch at my local garage.


I purchased a trailer hitch, ball mount, pin, and wiring set for my 2006 Toyota Tacoma. They were delivered promptly and in good order. With the help of the online videos, as well as the informative written directions, I completed the installation of all items in less than an afternoon and everything fit and operated as advertised. I am very pleased with the products and the excellent service. Needless to say, I highly recommend

Dennis S.



The hitch and pin, along with the turn signals and brake lights continue to work consistently and dependably without any problems at all. Thanks again for the excellent products and service.


Thank you for such prompt service. I put this on my Polaris 570 mid size Ranger. The problem was a normal hitch was under the bed and a 2 inch rise was a bit too low for a level trailer. This fixed the problem moving the ball out further and higher. Much easier to hook up. I would recommend your company to others.


Great price … easy install…. Great quality product…..have bicycle platform rack installed on it.. also have Curt 4 way wiring harness and lighting… also excellent


Good for normal trailer hook up and towing, but when trailer hitch is not used and a trailer hitch insert is used a key locking clip and pin should be used to avoid any one stealing the insert you have inserted to replace the actual towing bracket. People have told me they had to learn the hard way on getting their College emblem stolen because they used the normal pin.

Etrailer Expert

Heather A.


If you need a locking pin I recommend part # 7683. Please keep in mind this lock will not work with double-walled hitches or some factory 2 inch trailer hitches that have an outside width wider than 2 5/8. If a longer pin length is needed, see hitch lock part # RH5-XL.


Nice sturdy pin and clip.



Still going strong one year later


Fit was perfect as advertised, great pr oduct.


Be nice if it actually worked on 2 1/2” hitches the pin is a 1/4 short on my gmc to put safety pin in

Etrailer Expert

Jenny N.


There are hitch pins that will have a longer usuable length like part # 337HP6256WC which has a 4-inch span.


This ball fit perfectly on the hitch. The camper hooks up to it very easily.


I'm very pleased with my purchase of the Curt trailer hitch. Self installation went fairly smooth. I'm getting a lot of use out of my hitch with my bike rack. The instructions were pretty straight forward, plus some YouTube videos helped. I would definitely recommend the Curt hitch.


The hitch pin arrived quickly and in good condition. A great product at a great price. is an excellent company to deal with.

Ron C.


Everything is still performing very well. Great products with excellent service.


I bought the trailer hitch lower kit, works very good and is solid. Bought the locking pin , easy to use and has held up in great condition. Last, I bought the load stabilizer, simple product but effective, thanks guys for being helpful and having great products


Ordered this with a trailer hitch. It is a solid product and I'm very happy with it.



still a solid product.


fits well. does what it supposed to do

Show More Reviews

See what our Experts say about this CURT Hitch Pins and Clips

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