FLEX-HONE GB45812 Cylinder Hone, 4-5/8 Inch Bore, 120 Grit, Silicon Carbide

FLEX-HONE GB45812 Cylinder Hone, 4-5/8 Inch Bore, 120 Grit, Silicon Carbide

• The Brush Research GB45812 Flex-Hone is a professional-grade cylinder honing tool designed for 4.625" bores. It features 120 grit silicon carbide abrasive and a durable brush-type bead construction. This tool delivers a plateau-style, non-directional cross-hatch finish that enhances lubrication retention and surface quality in cast iron, steel, stainless steel, and other ferrous materials.
• Features:
  • Bead-style, flexible brush design with self-centering, self-aligning, and wear-compensating nylon filaments.
  • 120 grit silicon carbide abrasive removes peaks while preserving valleys for oil retention (~35–50 µin Ra).
  • Produces a non-directional, plateaued cross-hatch pattern ideal for sealing and consistent lubrication.
  • Heavy-duty construction suitable for large bores in engine blocks, hydraulics, and industrial components.
  • Made in the USA by Brush Research Manufacturing.
• Specifications:
  • Bore Size: 4.625" (118 mm)
  • Abrasive: Silicon Carbide
  • Grit: 120 (Medium)
  • Abrasive Length: 4" hone section; Overall Length: 13.5".
  • Stem Diameter: 0.31" (≈8 mm).
  • Recommended RPM: 600–900 RPM (maximum 600 RPM for consistent finish and tool life).
  • Typical Finish: ~35–50 µin (0.9–1.4 µm) plateau Ra.
  • Tool Weight: ~1.38 lb (shipping weight).
  • Applications: Cast iron, steel, stainless steel, and softer ferrous materials.
  • Country of Origin: USA.
• The FLEX-HONE GB45812 can also be referred to as 4.625 Inch flex hone, GB45812 hone, silicon carbide flex-hone, plateau honing brush, and cylinder hone tool.

Brush Research Manufacturing has over 60 years of experience producing innovative surface finishing tools. Their GB-series Flex-Hones are recognized worldwide for delivering consistent, plateau-style finishes in large bore hydraulic, engine, and industrial applications.

Q: What materials is the GB45812 designed for?
A: It’s ideal for cast iron, steel, stainless steel, and other ferrous materials commonly used in large bore cylinders and hydraulic applications.

Q: Can I use this tool with a handheld drill?
A: Yes, but maintain the tool within the recommended 600–900 RPM range using a drill press or handheld drill for best results.

Q: What finish does the 120 grit produce?
A: It generates a medium plateau finish (~35–50 µin Ra), balancing material removal with oil-retaining surface valleys.

Q: How long does the tool typically last?
A: Proper lubrication and RPM control allow the hone to resurface multiple bores before needing replacement—monitor tool wear regularly.

Q: What lubricant should be used?
A: Use light honing oil or suitable oil-based lubricants to extend tool life and optimize finish; avoid solvents that may degrade the abrasive bond.