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Description
CTO-3721X BRAKE DRUM (FRONT, 15.00" X 4")Technical Specifications Part Type Brake Drum (Stud Pilot Ball Seat) Industry Number 3721X, 3721A (Webb 66893) Brake Size 16. 5" x 7" (Friction Surface) Mounting Type Stud Pilot (Ball Seat) Features chamfered holes for tapered nuts. Bolt Holes 10 Holes Bolt Circle 11. 25" Pilot Hole 8. 78" CRITICAL SAFETY WARNING: 3721X vs. 3600AX Do not confuse these drums. They look similar but mount differently: 3721X (This Part): Stud Pilot. Holes have a chamfer
Technical Specifications
| Part Type | Brake Drum (Stud Pilot / Ball Seat) |
| Industry Number | 3721X, 3721A (Webb 66893) |
| Brake Size | 16.5" x 7" (Friction Surface) |
| Mounting Type |
Stud Pilot (Ball Seat) Features chamfered holes for tapered nuts. |
| Bolt Holes | 10 Holes |
| Bolt Circle | 11.25" |
| Pilot Hole | 8.78" |
⚠️ CRITICAL SAFETY WARNING: 3721X vs. 3600AX
Do not confuse these drums. They look similar but mount differently:
Do not confuse these drums. They look similar but mount differently:
- 3721X (This Part): Stud Pilot. Holes have a chamfer (bevel). Must use tapered nuts (Capuchón).
- 3600AX (Modern): Hub Pilot. Holes are flat. Must use flat washer nuts.
- Mixing them will cause wheel detachment.
Cross References
| Brand | Part Number |
|---|---|
| CTO | CTO-3721X |
| Automann | 145.3721AX |
| ConMet | 10009920 |
| Durabrake | 3721AX |
| Fleetrite | FLT3721AX |
| Gunite (Accuride) | 3721AX (Balanced), 3721A |
| KIC | 60000 |
| Meritor | 85-123205 |
| Webb Wheel | 66893 (Current Standard) |
Shoe Compatibility & Selection Guide
| Compatible 16.5" x 7" Shoes | |
Works with standard 16.5x7 shoes. Commonly paired with:
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|
|
???? THE GOLDEN RULE OF SELECTION: Look at the wheel nuts on the truck:
|
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 636 reviews
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Product Reviews
★★★★★ 5
Comfort
Color: Champagne, Size: Queen
What a lifesaver, great feel, and awesome cooling feel
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
★★★★★ 5
Cool bedding
Color: Champagne, Size: Queen
As advertised nice and soft. But most of all cool. It really stays cool, especially on warm nights. A.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
Awesome Pillow!!!
Size: Queen, Number of Items: 1
This pillow is Amazing!!! So Great to sleep on. I finally can get a good night's sleep!!! Its very soft and comfortable. I also haven’t gotten up with a stiff neck in the morning either!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
★★★★★ 5
Love them!!
Size: Queen, Number of Items: 2, Size: Queen, Number of Items: 2
Ok I normally don't leave reviews but I had to on this pillow. I was looking forever for a pillow and was nervous about buying one because you know how that usually goes when it comes to buying pillows. They arrived compressed but when you unwrap them they blow up to be a heavy duty pillow. Firm but not too firm. I don't like super soft pillows that you can roll up in a ball with one hand, I like a pillow that gives support and these do just that. They are cooling as well they are pretty for a pillow with the unique design. If you are in the market for a pillow and reading this THEN BUY THIS PILLOW & come back to tell me thank you. I promise you will NOT be disappointed. No I didn't get paid to say any of this. I wanted to give a honest review where it deserves one! You will not be disappointed! Thanks for the fast over night shipping as well. Not to mention the pricing is on point. I can say right now you will not find 2 pillows of this quality & price.
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Reviewed in the United States on April 1, 2026
★★★★★ 5
Perfect pillows
Size: Queen, Number of Items: 2
Soft, but durable. Comfortable and cool during sleep.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
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