FLEX-HONE GB31418 Cylinder Hone, 3-1/4" Bore, 180 Grit, Silicon Carbide
- The Brush Research GB31418 Flex-Hone is a medium-duty cylinder honing tool designed for 3-1/4" bore diameter applications. Featuring 180 grit silicon carbide abrasive, it provides a balanced plateau-style cross-hatch finish ideal for improving oil retention, reducing leakage, and preparing sealing surfaces in hydraulic systems, engine blocks, and industrial components.
- Features:
- Bead-style, flexible filament brush design with self-centering and self-aligning action
- 180 grit silicon carbide abrasive removes machining peaks while preserving oil-retaining valleys (~30–40 µin Ra)
- Non-directional plateau cross-hatch pattern enhances sealing consistency and fluid flow
- Durable construction suited for hydraulic, pneumatic, automotive, and industrial applications
- Specifications:
- Bore Diameter: 3-1/4"
- Abrasive Material: Silicon Carbide
- Grit: 180 (Medium-Fine)
- Abrasive Length: 3-1/4"
- Overall Length: 13.5"
- Stem Diameter: 0.31"
- Recommended Speed: up to 900 RPM
- Typical Surface Finish: 30–40 µin Ra
- Applications: Hydraulic cylinders, engine bores, valve guides, industrial piping
- The FLEX-HONE GB31418 can also be referred to as 3-1/4" bore hone, GB31418 flex hone, 180 grit cylinder hone, silicon carbide plateau brush, and industrial bore tool.
Brush Research Manufacturing’s GB-Series Flex-Hones are trusted worldwide in automotive, hydraulic, and industrial environments for delivering precise plateau finishes in medium bore applications.
Q: What bore diameter is this hone designed for?
A: The GB31418 Flex-Hone is specifically made for use in 3-1/4" bore diameter cylinders.
Q: What finish quality does the 180 grit provide?
A: The 180 grit creates a medium-fine plateau finish around 30–40 µin Ra, ideal for seal seating and lubricant retention.
Q: Can I use this hone in a handheld drill?
A: Yes—use a handheld drill or drill press at speeds up to 900 RPM with proper honing oil to maintain abrasive bond integrity.
Q: What materials is this hone suitable for?
A: Suitable for hydraulics, engine bores, valve guides, and industrial cylinders made from cast iron, steel, stainless, and other ferrous materials.
Q: What lubricant should I use?
A: Use oil-based honing lubricant to protect the abrasive and extend tool life. Avoid solvents that could weaken the bond.
