FLEX-HONE GBD31218 Cylinder Hone, 3-1/2 Inch Bore, 180 Grit, Silicon Carbide
- The Brush Research GBD31218 Flex-Hone is a robust cylinder honing tool designed for 3-1/2" bore diameter applications. Featuring 180 grit silicon carbide abrasive, it delivers a medium-fine plateau-style cross-hatch finish ideal for improving lubrication retention, reducing leakage, and preparing sealing surfaces in engine blocks, hydraulic cylinders, and industrial bores.
- Features:
- Bead-style, flexible filament design with self-centering and self-aligning action
- 180 grit silicon carbide balances peak removal and valley preservation (~30–40 µin Ra)
- Non-directional plateau cross-hatch pattern enhances lubrication consistency and sealing performance
- Heavy-duty construction suited for professional automotive, hydraulic, and engine applications
- Specifications:
- Bore Diameter: 3-1/2"
- Abrasive Material: Silicon Carbide
- Grit: 180 (Medium-Fine)
- Abrasive Length: 3-1/2"
- Overall Length: 13-1/2"
- Stem Diameter: 0.31"
- Recommended Speed: up to 600 RPM
- Typical Surface Finish: 30–40 µin Ra
- Applications: Engine bores, hydraulic cylinders, industrial piping
- The FLEX-HONE GBD31218 can also be referred to as 3-1/2" bore hone, GBD31218 flex hone, 180 grit cylinder hone, silicon carbide plateau brush, and standard-duty bore finishing tool.
Brush Research Manufacturing’s GBD-Series Flex-Hones are trusted across automotive, hydraulic, and industrial industries for delivering consistent plateau-style finishes in moderate bore applications.
Q: What bore diameter is this hone designed for?
A: The GBD31218 Flex-Hone is specifically designed for use in 3-1/2" bore diameter cylinders.
Q: What finish quality does the 180 grit produce?
A: It creates a medium-fine plateau finish around 30–40 µin Ra, improving oil retention and seal seating.
Q: Can I use this hone with a handheld drill?
A: Yes—when used with handheld drills or drill presses, maintain speeds up to 600 RPM and use honing oil.
Q: What materials is this hone suitable for?
A: Effective on cast iron, mild steel, stainless steel, and other ferrous materials commonly found in industrial and hydraulic cylinders.
Q: What lubricant should I use?
A: Use oil-based honing lubricants to protect the abrasive bond and ensure consistent finish quality.
