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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: $7.13
Hitch Pins and Clips
Shipping Weight: 0.57 lbs
In Stock
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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 (813)
  • Q & A (0)
  • 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   (813 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.


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.

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.
-- Etrailer Expert Katrina B - 05/15/2023


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.


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!!!!


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.

Still working like a champ. No rust, a little wear on the pin, but it still works like day 1.
Rich G - 04/23/2019


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.


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!


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.


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


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!


Fit was perfect as advertised, great pr oduct.


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


fits well. does what it supposed to do


Nice sturdy pin and clip.

Still going strong one year later
Stephen - 10/03/2022


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

There are hitch pins that will have a longer usuable length like part # 337HP6256WC
Hitch Pin and Clip For 2-1/2" and 3" Hitches - 5/8" Diameter x 4" Span
which has a 4-inch span.
-- Etrailer Expert Jenny N - 03/31/2022


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.
Dennis - 10/07/2014


Works well.


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.


Very nicely made with a protective coating on th handle portion


Perfect fit for the 2022 Honda CRV. Installation was straight forward with the included instructions and watching the installation video also helped. Overall, it took about an hour and a half to install.


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

still a solid product.
Haywad - 04/20/2022


Easy installation. Great for hauling bikes etc. Cosmetically hitch looks great with no rust


Good quality pin and clip set for an affordable price.


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.

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.
-- Etrailer Expert Heather A - 11/07/2018


All good with all items that i bought

Show More Reviews

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

  • Recommended Pin And Clip To Replace Lost Pin On Curt Folding Cargo Carrier For 2 Inch Receivers
    It sounds like the pin that allows the cargo carrier to be tilted up or down is what you are missing. I have attached a photo of the pin on a cargo carrier. If that is the pin and clip that is missing I recommend using part # C21510 as a replacement. This pin is designed for 2 inch and 2-1/2 inch trailer hitches and my contact at Curt said the pin would work well for you.
    view full answer...
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  • What is the Weight Rating of the Curt Pin and Clip # C21510
    Hitch pins are not given weight ratings because they are built with such extreme weight bearing capabilities that the trailer hitch, ball mount or trailer coupler is more likely to fail than the hitch pin. Most Class IV trailer hitches have a maximum towing capacity of 12,000 lbs and a tongue weight capacity of 1,000 lbs. Before you tow your horse trailer, you will also want to verify the towing capacity of your tow vehicle. There are instances where a Class IV hitch is available for...
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  • Hitch For A 2013 Chevy Express 4500 Cutaway
    We offer universal fit hitches that fit many different vehicles. To add a class IV or V hitch to your 2013 Chevy express 4500 Cutaway from the hitches we carry, would require the hitch to be welded in place. I recommend the Curt Class V Universal Weld-on Receiver Hitch Item # 15903. This hitch fits frame rail spacing from 18" apart up to 61" apart, has a 1500lb max tongue weight with a 15000lb gross towing capacity, a 2" x 2" receiver tube opening with a 5/8" hitch pin hole. I also recommend...
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  • What is Difference Between Hitch Pin Diameters of 1-1/4 inch and 2 inch Hitches
    The Curt Class I and II Pin and Clip # C21410 is designed for use on 1-1/4 inch trailer hitches which do have 1/2 inch diameter hitch pin holes. The larger 5/8 inch hitch pins are used on the larger 2 inch hitch size. For that we have the part # C21510.
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  • Bolt Hole Measurements of the Curt Trailer Hitch Receiver Class III 2" # 13408
    My contact at Curt Manufacturing confirmed, that the bolt holes on the Curt Trailer Hitch Receiver Class III - 2" # 13408, are spaced 4.35" on center from front to back. The forward most holes are spaced 39.937" apart on center, and the rear most holes are 39.437" apart on center.
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  • Bumper Clearance on Curt High-Low Adapter # C59KR
    The Curt High-Low Adapter # C59KR should work for giving you ground clearance for your cargo carrier. The measurement from the shank hitch pin hole to the back end of the top receiver is 5-1/2", which should be enough clearance for your bumper. Refer to the diagram attached below and measure your hitch setup to make sure. Note this adapter does not come with a hitch pin and clip. If you need one, I recommend the Curt # C21510. Check out the videos linked below for more details on these...
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    Image 1 for
  • Adapter For 2 Inch Hitch to Use Curt Bike Rack C18085
    While there is not a replacement sleeve adapter for the rack, there is a way to still use it in your 2 inch hitch so you don't have to get a new bike rack. What you can do is use a 2" to 1-1/4" adapter, and it will also need a pin and clip to secure the adapter to your hitch: - Hitch Adapter 2" to 1-1/4" Trailer Hitch Receiver # 80300 - Pin and Clip # C21510
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  • Recommended Hitch Pin for Curt Trailer Hitch on a 2019 Honda Pilot
    The hitch pin hole on the Curt Trailer Hitch Receiver # C13146 for your 2019 Honda Pilot has a 5/8" diameter as you can see in the attached installation video. If you are just wanting a standard hitch pin and clip then I recommend the part # C21510. For a locking hitch pin I recommend the Curt # C23519 instead.
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  • Can Chains be Connected to Curt Hitch Extender
    There is not a place for safety chains to connect to the 18" Curt Extender for 2" Receivers # C45796 so you would need to get new safety chains as well; I have added a link to our selection of safety chains for you to check out such as the 60" # C19749. Keep in mind you will need Pin and Clip # C21510 in order to attach the extender to your current hitch, and that an extender is going to reduce the capacity of your current trailer hitch by 50 percent.
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  • What is the Correct Hitch Pin Size for a 16 Foot Trailer
    The hitch pin you need is going to depend on which size receiver you have on your hitch. More than likely you have a 2" receiver, which means you want a 5/8" diameter hitch pin like the Curt Pin and Clip for 2" and 2-1/2" Hitches - 5/8" Diameter x 3-3/16" Span # C21510. Just to be clear, the cotter pin is the smaller pin that comes with the hitch pin in order to secure it. If you're looking for a ball mount and have a 2" receiver, I recommend the etrailer Ball Mount Kit - 3/4" Rise or...
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  • What Size Hitch Pin Fits Pro Series Cargo Carrier for 2 Inch Hitch
    For a traditional pin and clip, I would recommend Curt's hitch pin and clip # C21510. This hitch pin and clip is designed to work with Class III, Class IV, and Class V trailer hitches. If you are looking for a locking hitch pin, I recommend this stainless steel lock # e98882. This locking hitch pin is designed to fit Class III and Class IV hitches.
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  • 18 Inch Hitch Extender that Fits 2 Inch Trailer Hitch
    The # D30 you referenced is for hitch fabrication and it sounds like you simply need a hitch extender. There is an 18 inch extension, the Curt Extender for 2" Receivers -18" Long # C45796 which you can use with a bike rack. The only thing to note is that the use of any extender will reduce the overall capacity of the hitch by 50 percent and that includes the tongue weight capacity. This is important because the tongue weight capacity of your hitch is the max weight your bike racks and...
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  • Options for Securing Au-Tomotive Gold Honda Trailer Hitch Cover AUT-HON-C In Hitch Opening
    The Au-Tomotive Gold Honda Trailer Hitch Cover # AUT-HON-C does not include a pin-and-clip nor a gasket for installation. A pin-and-clip kit # C21510 is available, as is a locking anti-rattle kit # 63232 which will both prevent theft and eliminate any potential for rattle in the hitch opening. This hitch cover will easily fit in your 2-inch hitch.
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  • How to Use Hitch Mount Spare Tire Carrier For 2 Inch Hitch in 1-1/4 Inch Hitch
    There is a way to use a hitch-mounted spare tire carrier in your 1-1/4 inch hitch, though there isn't a carrier that fits that size hitch by itself. Instead, you would need an adapter, so what you can use is the following: - Curt Trailer Hitch Mounted Spare Tire Carrier # c31006 - Hitch Adapter 1-1/4" to 2" Trailer Hitch Receiver # HTAD Just keep in mind this will reduce the overall capacity of your hitch by 50 percent. So if your hitch has a tongue weight capacity of 200 lbs, for example,...
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  • Replacement Hardware Kit for Curt Trailer Hitch Receiver 13416
    For your Curt # C13416 you will need the Replacement Hardware Kit for Trailer Hitches # RHK. This does not come with the hitch pin clip so you will need # C21510 or # C21500.
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  • How to Choose the Correct Ball Mount for a 2017 Subaru Forester
    In order to choose the correct ball mount you will need to measure from the ground to the top of the inside edge on the vehicle's receiver tube opening and then compare that to the distance from the ground to the bottom of the coupler on the trailer while level. The distance between these two measurements will give you the correct amount of rise/drop you will need to look for in a ball mount. For a ball mount with a 5" rise I recommend part # C45336 and for a ball mount with a 6" rise...
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  • Pin and Clip and Locking Hitch Pin Recommendation for US Air Force Trailer Hitch Cover # AUT-AIRW-C
    The US Air Force Trailer Hitch Cover # AUT-AIRW-C that you referenced does not come with a hitch pin. For a standard hitch pin you would want the part # C21510. For a locking hitch pin you would want the part # C23519.
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  • Trailer Hitch Receiver For 2022 Toyota Sienna For Bike Rack
    There are indeed only 2 inch trailer hitch receivers that fit your 2022 Toyota Sienna, though if your bike rack only fits a 1-1/4 inch hitch, you can use a hitch adapter and reducer. First, for the hitch, by far the best option for a bike rack for your '22 Sienna is the following: - etrailer Trailer Hitch Receiver # e56RR Not only does the # e56RR have the best bumper clearance, but it also has a matte black finish which hides the inevitable dings and scratches better than glossier finishes....
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  • Hitch Adapter to Raise a Cargo Carrier up 8 for Clearance in a Low Vehicle
    I can provide you with an option but you probably aren't going to be hitting the 200 lb. mark you are hoping for, especially after taking the weight of the cargo carrier into consideration. You can use the Roadmaster High-Low Adapter # RM-048-8. The catch is that when using an adapter that extends your hitch, which is what an adapter to gain rise does. You will reduce your hitches tongue weight rating by 50%. Obviously, how much weight that leaves you with depends on the hitch that you...
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  • Recommended Hitch Pin to Work with Curt Forged Ball Mount
    We have hitch pins to work with the Curt Forged Ball Mount, part # C45456, however it doesn't include one. I recommend the Curt Pin and Clip, part # C21510, for a standard pin, or even better, part # e98881 for a locking pin. If you also need a compatible hitch ball use part # 63840.
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  • Does Buyers Products BH10 Series Combination Hitch Fit Pintle Hook Mount 337PM25812
    Yes, the Buyers Products BH10 combination hitch will absolutely bolt to the pintle hook mount. The hitch has a mounting holes that are spread apart 1-3/4" vertically and 3-3/8" horizontally, which is the same distance between the holes on the mount. So the two parts you asked about will be a perfect match: - Buyers Products 10 Ton Combination Hitch with Mounting Kit - 2-5/16" Ball - BH10 Series # 33710057 - Buyers Products 3 Position Pintle Hook Mount for 2-1/2" Receiver # 337PM25812 Both...
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  • How To Fix Stripped Threads On the Hitch Pin Hole In the Shank for the Reese Eclipse 4 Bike Rack
    If you have the hitch pin for the Reese Eclipse 4 Bike Rack part # 63124 engaged enough so that the cotter pin can be inserted into the other side, then this will be sufficient in order to hold the shank inside of the receiver tube. That said, the bike rack may not be as stable as it would be with full thread engagement so that is something to keep in mind. I cannot really recommend that you drill and tap the weld nut inside the shank, but you could just drill this out with a 5/8" drill...
    view full answer...
  • How to Prepare a 2" Trailer Hitch Receiver for Winter Weather
    In order to prevent rust from accumulating inside the trailer hitch receiver while not in use I recommend using a hitch cover like the Tow Ready Black Plastic Hitch Cover for 2" Trailer Hitches part # TR1202 to cover the receiver tube opening and a standard hitch pin like the Curt Pin and Clip part # C21510 to cover the hitch pin hole.
    view full answer...
  • Can 18 Inch Hitch Extension be Used With 2 Inch Drop Ball Mount
    Yes, your 2000 Ford F-350 can use a ball mount with a 2 inch drop like # C45310 with an 18 inch extension, the Curt Extender # C45796. Keep in mind an extender will reduce the capacity of your trailer hitch, the Reese by 35 percent and the Curt by 50 percent. The extensions will also need a pin and clip or hitch lock to secure to your Ford's hitch, the Pin and Clip # C21510 or Hitch Lock # e98880.
    view full answer...

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Info for this part was:

Employee Lindsey S
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Employee Wilson B
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Employee Isabelle B
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Employee Jeff D
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Employee Jacob T
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