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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:
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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
4.3 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 4
Not true to size but great quality.
Color: Black 02, Size: Medium
I bought a medium for my son who normally wears medium. It was extremely big. The quality and arm length was good.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
Nice suite
Color: Black&red, Size: Small, Color: Black&red, Size: Small
Delivery was on time. Suit fit perfect I bought it for my son 8th grade dance. It was worth the money and quality was good
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Does run big
Color: Black 02, Size: Small, Color: Black 02, Size: Small
Very nice suit but it does run big and I had to get it tailored! I really should have purchased the Xtra small for him!
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Looks exactly like the photo.
Color: White 02, Size: X-Large, Color: White 02, Size: X-Large
The material of the suit is nice. Had to get the suit jacket taken in, worth the buy.
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Reviewed in the United States on March 22, 2026
★★★★★ 1
Not To Happy For A Beautiful Design Suite
Color: White 02, Size: Medium, Color: White 02, Size: Medium
Fits well just material is very cheap and fabric is gun glued on. Pants came with a rip
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Reviewed in the United States on May 23, 2025