FLEX-HONE BC21232 Cylinder Hone, 2-1/2" Bore Diameter, 320 Grit, Silicon Carbide
- The Brush Research BC21232 Flex-Hone is a precision honing tool engineered for 2-1/2" bore diameter applications. Featuring 320 grit silicon carbide abrasive, it delivers a fine, plateau-style cross-hatch finish ideal for improving lubrication retention, reducing leakage, and enhancing seal performance in brake cylinders, hydraulic systems, and pneumatic components.
- Features:
- Self-centering and self-aligning design for consistent, even surface contact
- 320 grit silicon carbide abrasive provides a fine finish with typical surface roughness of 18–30 µin Ra
- Non-directional plateau finish improves lubrication flow and seal integrity
- Compact 3" abrasive section allows precision work inside small bore components
- Made in the USA by Brush Research Manufacturing
- Specifications:
- Bore Diameter: 2-1/2"
- Abrasive Material: Silicon Carbide
- Grit: 320 (Extra-Fine)
- Abrasive Length: 3"
- Overall Length: 8"
- Stem Diameter: 0.245"
- Recommended Speed: 800–1,200 RPM
- Typical Surface Finish: 18–30 µin Ra
- Applications: Brake cylinders, valve guides, hydraulic and pneumatic cylinders
- Country of Origin: USA
- The FLEX-HONE BC21232 can also be referred to as 2-1/2" bore hone, BC21232 flex hone, fine grit cylinder hone, plateau honing tool, and silicon carbide bore brush.
Brush Research Manufacturing has over 60 years of experience in developing industry-leading surface finishing tools. Their Flex-Hone series is trusted by professionals worldwide for delivering consistent, high-quality finishes across automotive, hydraulic, and industrial applications.
Q: What bore diameter is this hone designed for?
A: The BC21232 is specifically designed for use in 2-1/2" bore diameter cylinders.
Q: Can I use this hone in a handheld drill?
A: Yes. It can be used in handheld drills or drill presses at 800–1,200 RPM with proper lubrication.
Q: What finish quality does 320 grit provide?
A: 320 grit produces a fine plateau finish around 18–30 µin Ra, ideal for tight sealing and oil retention.
Q: What materials is this hone suitable for?
A: It is effective on mild steel, stainless steel, cast iron, and softer non-ferrous metals such as aluminum and brass.
Q: What lubricant should be used?
A: Use oil-based honing lubricants. Avoid solvents to protect the abrasive bond and prolong tool life.
