FLEX-HONE GBD41412 Cylinder Hone, 4-1/4" Bore Diameter, 120 Grit Silicon Carbide
The Brush Research GBD41412 Flex-Hone is a heavy-duty cylinder honing tool designed for 4-1/4" bore diameter applications. Featuring 120 grit silicon carbide abrasive and a 6" honing section, it delivers a 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
- 120 grit silicon carbide abrasive balances peak removal with preservation of oil valleys (approx. 35–50 µin Ra)
- Non-directional plateau cross-hatch pattern enhances seal integrity and fluid retention
- Heavy-duty construction optimized for large-diameter bores in block and industrial applications
- Specifications:
- Bore Diameter: 4-1/4"
- Abrasive Material: Silicon Carbide
- Grit: 120 (Medium)
- Abrasive Length: 6"
- Overall Length: 13-1/2"
- Recommended Speed: up to 600 RPM
- Typical Surface Finish: 35–50 µin Ra
- Applications: Engine blocks, hydraulic cylinders, industrial bores
The FLEX-HONE GBD41412 can also be referred to as 4-1/4" bore hone, GBD41412 flex hone, silicon carbide cylinder hone, plateau finishing brush, and heavy-duty bore tool.
Brush Research Manufacturing’s GBD-Series Flex-Hones are trusted across automotive, hydraulic, and industrial sectors for delivering consistent plateau-style finishes in large-bore applications.
Q: What bore diameter is this hone designed for?
A: The GBD41412 is engineered specifically for use in 4-1/4" bore diameter cylinders.
Q: What finish quality does the 120 grit provide?
A: It creates a medium plateau finish in the range of 35–50 µin Ra, ideal for sealing surfaces and oil retention.
Q: Can this hone be used with a handheld drill?
A: Yes—as long as you maintain recommended speeds up to 600 RPM and use oil-based honing lubricant.
Q: What materials is this hone suitable for?
A: Effective on mild steel, stainless steel, cast iron, and other ferrous materials commonly found in engine and hydraulic cylinders.
Q: What lubricant should be used?
A: Use oil-based honing lubricants to protect the abrasive bond and ensure reliable finish performance.
