Red 3-Arm Star Knob | Fits AMMCO Brake Lathes | Part #6854

Brake Lathe Details

Replacement red 3-arm star knob for AMMCO bench brake lathes. Restores the original ergonomic grip and high-visibility color coding to feed and lock adjustment shafts after the OEM knob cracks, strips, or wears smooth from years of shop use. The 3-arm geometry provides better torque application than smooth or round knobs, and the bright red finish improves visibility against typical lathe and shop backgrounds.

Part #: 6854
Color: Red (high-visibility)
Geometry: 3-arm star
Application: Feed and lock adjustment shaft control knob
Lathe compatibility: AMMCO bench brake lathes
Replaces: OEM 6854 star knob
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Frequently Asked Questions (FAQs)

Will this knob fit all Ammco bench lathes?

Yes. This 3-arm knob is designed to the exact specifications of the Ammco 6854 standard. It is compatible with the legendary 4000 and 4100 series, as well as the newer 7500 and 7700 models. It fits the threaded studs typically found on tool posts, twin-cutter assemblies, and cross-feed locks.

Is the internal thread plastic or metal?

Our knobs feature a threaded steel core embedded within the polymer housing. Unlike cheap all-plastic knobs that strip after a few uses, the steel core provides a metal-on-metal connection with your lathe's studs, ensuring a tight, reliable lock every time.

Can I use these knobs for custom shop jigs or other equipment?

While specifically designed as a replacement for Ammco #906854, these are industrial-grade star knobs. If your equipment uses the same thread pitch and diameter as a standard Ammco stud, these will serve as a high-quality upgrade for any machinery requiring a manual locking handle.

What is the benefit of the red color?

In many shops, the original black knobs blend into the cast-iron body of the lathe. The High-Visibility Red acts as a safety and efficiency feature, allowing the technician to instantly identify adjustment points. This is particularly helpful when training new techs or working in low-light shop environments.