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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 (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: 4515 (Old Meritor Q) - Very common on older trucks that use this drum. 4707 (Meritor Q Plus). ???? THE GOLDEN RULE OF SELECTION: Look at the wheel nuts on the truck: Do you use Flat Washer Nuts? -> You need 3600AX. Do you use Tapered Cap Nuts (Capuchón) ? -> You need 3721X (This Part).
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$151.80