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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
4.6 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 4
It's a functional organizational tray
I bought this valet tray for my nephew to be able to organize his go-to items, such as his cell phone, wallet, watch, bracelet, etc. I expected the tray to look more upgraded. The compartments are shallow, but they do the job. It is made of a cardboard-type material ( corkboard would have been nicer), and the black platform is a metal construction, which gives it a more stable and solid structure. Overall, for the price and its functionality, I guess it was worth the purchase.
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Reviewed in the United States on January 15, 2026
★★★★★ 5
Really wonderful
Beautiful and realy convenient to use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
★★★★★ 5
Great magnets and sturdy hooks
These are great hooks! I needed something quick and easy to move around - these fit the job perfectly. The magnets are strong enough to securely hold the ropes and cables I needed to hang, and yet we can move them around as needed. Great purchase!
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Reviewed in the United States on December 23, 2025
★★★★★ 5
Strong and so handy!
I love these! They’re better than I expected and they work perfectly!! Strong, and hold a lot of weight.
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Reviewed in the United States on March 3, 2026
★★★★★ 5
Awesome
I have so many of these attached to my tool box. I hang so many different things from them including my drills.
Love them and will probably buy more soon.
Well made and very strong magnets.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2026
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