FLEX-HONE GB31424 Cylinder Hone, 3-1/4 Inch Bore, 240 Grit, Silicon Carbide
- The Brush Research GB31424 Flex-Hone is a standard-duty cylinder honing tool designed for 3-1/4" bore diameter applications. Featuring 240 grit silicon carbide abrasive, it delivers a medium plateau-style cross-hatch finish ideal for improving lubrication retention, reducing leakage, and enhancing seal performance in engine bores, hydraulic cylinders, pneumatic systems, and industrial equipment.
- Features:
- Bead-style, flexible filament design with self-centering, self-aligning action
- 240 grit silicon carbide abrasive balances peak removal with retention of valleys (~24–32 µin Ra)
- Non-directional plateau cross-hatch pattern promotes lubrication consistency and seal integrity
- Standard-duty brush length optimized for 3-1/4" applications
- Specifications:
- Bore Diameter: 3-1/4"
- Abrasive Material: Silicon Carbide
- Grit: 240 (Medium)
- Abrasive Length: 3.5"
- Overall Length: 13.5"
- Stem Diameter: 0.31"
- Recommended Speed: up to 900 RPM
- Typical Surface Finish: 24–32 µin Ra
- Applications: Engine bores, hydraulic cylinders, pneumatic components, industrial piping
- The FLEX-HONE GB31424 can also be referred to as 3-1/4" bore hone, GB31424 flex hone, silicon carbide cylinder hone, plateau honing brush, and medium grit bore tool.
Brush Research Manufacturing’s GB-Series Flex-Hones are trusted worldwide for delivering consistent plateau finishes in medium-bore industrial applications. These standard-duty tools provide reliable performance across automotive, hydraulic, and equipment maintenance tasks.
Q: What bore diameter is this hone designed for?
A: The GB31424 Flex-Hone is designed specifically for use in 3-1/4" bore diameter cylinders.
Q: What finish quality does the 240 grit provide?
A: It achieves a medium plateau finish around 24–32 µin Ra, improving seal seating and oil control.
Q: Can I use this hone with a handheld drill?
A: Yes—use with handheld drills or drill presses at speeds up to 900 RPM, applying honing oil for best results.
Q: What materials is this hone suitable for?
A: Effective on mild steel, stainless steel, cast iron, and other ferrous materials commonly found in engines, hydraulics, and industrial cylinders.
Q: What lubricant should I use?
A: Use oil-based honing lubricants to maintain abrasive bond integrity and achieve optimal surface finish.
