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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 24 reviews
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Product Reviews
★★★★★ 5
Good value
Color: Jelly Pink, Material Type: Paper, PU
This is a great jewelry box for travel or to just keep at home. Very stylish and holds more than it looks like it would.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 10, 2026
★★★★★ 5
CUTE
Color: Cloud White, Material Type: Paper, PU
I absolutely love this jewelry organizer! The 2-layer design gives it plenty of space without being bulky, making it perfect for travel. I was able to neatly store my earrings, necklaces, rings, and bracelets without anything getting tangled.
The interior is soft and protects my jewelry really well, and the compartments are thoughtfully designed to keep everything in place. The compact size fits easily in my suitcase or handbag, which is a huge plus.
The cloud white color looks elegant and makes it feel like a great gift option too. Overall, it’s practical, stylish, and very convenient for keeping jewelry organized on the go. Highly
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 2026
★★★★★ 5
I bought myself one and this one was gift for a friend.
Color: Cloud White, Material Type: Paper, PU
Very classy travel jewelry box. Just the size. Made well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
★★★★★ 4
Nice Jewelry Box
Color: Jelly Pink, Material Type: Paper, PU, Color: Jelly Pink, Material Type: Paper, PU
Really nice jewelry box just smaller than expected. My fault for not checking the dimensions first. It’s a great value for the price.
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Reviewed in the United States on May 11, 2026
★★★★★ 5
Nice little jewelry box
Color: Cloud White, Material Type: Paper, PU
Just what I wanted in size and available compartments. The only thing I am hesitant about is the paper outside. Mine is white and may get dirty quickly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 16, 2026
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