3/8" - .371" Bullit-Balls - BB-371

(No reviews yet) Write a Review
Calculated at checkout

3/8" - .371" Bullit-Balls - BB-371

Part#: BB-371
Reference chart below for more details of part# above.

Regis Bullit-Balls® are the ultimate in sizing precision and durability. Tungsten carbide balls with a permanently attached steel shank are in the 90 rockwell range. Precision machined to exact specifications. Finished to .0000008” (eight millionths of an inch) perfect roundness.

When using bronze valve guides, remember the finished I.D. of the sleeve will be .001” smaller than actual ball size.

See Chart below for complete list of other Bullit-Balls

Part No. Description   Part No. Description 
BB-2165 5.5mm .2165"   BB-3445 11/32" .3445"
BB-2175 5.5mm .2175"   BB-345 11/32" .345"
BB-218 5.5mm .218"   BB-346 11/32" .346"
BB-237 6mm .237"   BB-354 9mm .354"
BB-238 6mm .238"   BB-355 9mm .355"
BB-260 6.6mm .260"   BB-356 9mm .356"
BB-261 6.6mm .261"   BB-372 3/8" .372"
BB-262 6.6mm .262"   BB-373 3/8" .373"
BB-263 6.6mm .263"   BB-374 3/8" .374"
BB-276 7mm .276"   BB-3745 3/8" .3745"
BB-277 7mm .277"   BB-375 3/8" .375"
BB-278 7mm .278"   BB-3755 3/8" .3755"
BB-312 5/16" .312"   BB-376 3/8" .376"
BB-3125 5/16" .3125"   BB-395 10mm .395"
BB-313 5/16" .313"   BB-396 10mm .396"
BB-315 8mm .315"   BB-434 11mm .434"
BB-316 8mm .316"   BB-435 11mm .435"
BB-317 8mm .317"   BB-436 7/16" .436"
BB-343 11/32" .343"   BB-437 7/16" .437"
BB-344 11/32" .344"   BB-438 7/16" .438"
Write a Review

This product hasn't received any reviews yet. Be the first to review this product!

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.