Description
Ammco 3904 Brake Lathe Centering Cone, 1.703″-2.750″ for 1″ Shaft
Replace a worn or missing centering cone when hubless brake rotors or drums are not centering correctly on the lathe. This tapered cone fits a 1″ diameter shaft and centers hub openings from 1.703″ to 2.750″. Use in combination with pressure cups for a clean, vibration-free cut.
Product Information
- Brand / Equipment: Ammco (Hennessy Industries)
- Manufacturer / Reference Part Number: 3904 (alternate: 903904)
- Store SKU: AMO3904
- Component: Tapered centering cone for hubless brake disc and drum work
- Shaft Diameter: 1″
- Centering Range: 1.703″ to 2.750″
- Listed Application: Hubless brake rotors and drums on brake lathes with a 1″ arbor shaft
Compatible Makes / Verified Fitment Models
- Ammco: 2002, 3000, 3850, 3860, 4000, 4000e, 4100, 7000, 7500, 7700
- Also fits other brake lathe brands with a 1″ shaft and matching cone range
Fitment & Ordering Notes
Verify your shaft diameter is 1″ and that your brake disc or drum hub opening falls within 1.703″-2.750″ before ordering. The part number 3904 is stamped on the back of the cone. Contact us at (866) 902-6060 with questions.
Additional Product Information
Original listing states this cone may replace the following manufacturer part numbers (cross-references unverified – confirm before ordering): Kwikway 101-0243-00, Hofmann/RJ West W 112, FMC/John Bean 90924, FMC/John Bean 92010, Rels 44004, Van Norman 866446, Hunter 192-111-2, Performance 8554.
All brand names and part numbers are used for reference and identification purposes only. This is an aftermarket alternative part; it is not produced by the original equipment manufacturer.


