Screw-On Rubber Endpin Ball (3/8" x 16 threads)

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  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
  • Screw-On Rubber Endpin Ball (3/8" x 16 threads)
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Frequently bought together:


If you have an endpin with a threaded tip, this is a replacement for your original rubber cap (that might have been lost, worn out, damaged, or otherwise rendered unusable or ineffective.)

This little sphere - about 1 3/8" in diameter - is the cure to dreaded "spouse comments about holes in carpet" as well as dirty looks when you spike your bass into somebody's wooden floor. It also will help avoid having your endpin skid across smooth surfaces. It's Similar to the Wolf Super Endpin Ball (we also sell that), but for screw-on double bass end pins. Extremely tough and long lasting. Made with high quality rubber. Unlike the standard screw-on rubber tip, the Ultra Sphere tip, due to its ball shape, allows for movement and leaning of the bass more comfortably.

While this endpin ball is robust, nothing is permanent, and, depending on use, it will eventually need to be replaced if significantly worn.

This will not fit ALL bass endpins. Will it fit yours?

This endpin ball has threads, and they must match the threads on your endpin exactly. If your endpin has different measurements than we've provided here, do not buy the endpin ball, it will not work with your endpin. Size matters!

To save you some time, this will not fit the stock (bare steel) Kay/Engelhardt endpin, which is 1/2" and does not have threads on it.

How to measure:

The threads that are on this endpin ball are specified as 3/8" x 16 (SAE). What that means is that the threads are on a 3/8" post, and there are 16 threads per inch. This is a common size, usually found on 10mm endpins, and there are a couple ways to confirm that's what you have:

    1. (BEST) Take the endpin out of the bass, and make a quick trip to the hardware or home improvement store (ACE, Home Depot, Lowe's, etc.) Most of them have a "board" of sorts that allows you to test fit a screw or nut to find out what the thread size is. (Such a board is shown in the photos, above - it's the yellow board, and you can see that I've fitted the black collar for the endpin ball onto the 3/8"x16 post.) Test-fit your endpin into the board, and if it fits properly into the threaded hole marked as "3/8"-16," you'll be CERTAIN that you have the right measurement.

    2. (PRETTY GOOD) Use a caliper to measure the diameter of the rod at the threads. If it's 3/8" (or really close) count threads along 1/2" length on the post (or a whole inch, if you're feeling saucy). If it's 8 threads for 1/2" or 16 threads for the inch -- it could be off by 1 in either direction, due to the orientation of the threads at any given moment -- then you can be fairly confident that you've got the right size.

    3. (NOT AS ACCURATE) Take a look at the photo above; the one where I've taken a closeup photo of the endpin threads next to a penny, for reference. Eyeball it as best you can. Since there are commonly only a few sizes, if you put a penny next to your endpin, you may be able to tell whether yours is similar by comparing. If you're not so good at spatial comparisons, though, this method has failure written all over it.

What if, after all that, I buy it and it doesn't fit?

We've provided you as much information as possible to ensure that it's the right fit before you buy. This is a small, low-cost item, and after deducting the costs of shipping, it will probably make returning this for refund or credit utterly pointless, for both of us. So please, measure before you order, so that you can be confident that it will be the right option for you. I guess what I'm saying, is, don't "screw" it up!


  • Ball Diameter: Approximately 1 3/8"
  • Threads in sleeve: SAE 3/8"-16 (3/8" post, 16 threads per inch)

Additional Tips

  • Ball is supplied in three parts: Rubber ball, plastic insert sleeve, and plastic washer. To make it easier to assemble, I recommend threading the plastic part onto the endpin, and then using the endpin as leverage to insert the plastic part into the ball (it's a snug fit.)
  • The washer can be put on the endpin threads first to act as a "counter screw" and help prevent vibrations or loss of the endpin ball. Simply tighten the two threaded parts firmly against each other to secure.
  • If you never "spike in" on the stage, and rarely (if ever) intend to remove the Endpin Ball (like most of us), I suggest getting a small tube of "Thread Lock" at the hardware/home improvement store. Get the "non-permanent" type -- the permanent type is basically superglue. Putting a drop of it on the threads before you put the ball on will hold it fast and prevent loss. If you later find that you must remove the ball, the non-permanent threadlock will allow you to use a bit of force to break the bond and unscrew it. (With the permanent kind, it's on for good!)
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