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FLEX HONE GBD 3-1/2 120SC - Brush Research

Part #: BSGBD31212

The Brush Research FLEX HONE GBD 3-1/2 120SC is a heavy-duty flexible cylinder hone engineered for professional surface finishing and deburring in 3-1/2 inch bores. Crafted with durable silicon carbide abrasive, this tool is designed to deliver a consistent, high-quality plateau finish, optimizing component performance and longevity. It is an indispensable tool for technicians and mechanics seeking to improve critical surface integrity.

Key Features

  • Self-Centering and Self-Aligning: The unique construction allows the tool to be self-centering and self-aligning to the bore, eliminating the need for elaborate or rigid setups and enabling use in both online machine tool applications and as a secondary operation.
  • Optimal Surface Finishing: Effectively reduces Ra, Rk, and Rpk values while maintaining the Rvk and Vo volume necessary for superior oil retention, crucial for moving parts.
  • Efficient Deburring: Removes burrs from cross-drilled holes, creating clean, radiused intersections. A forward and reverse rotation technique ensures a symmetrical deburring pattern.
  • Advanced Plateau Finishing: Pioneers the concept of a plateau finish by removing machining peaks, creating a substantially flat surface that allows rings and seals to seat without damage. This cross-hatch pattern aids in lubrication control, reduces seepage in hydraulic and pneumatic applications, and promotes extended seal life.
  • Heavy-Duty Construction: As a GBD series tool, it features a longer abrasive length compared to standard hones, providing more abrasive material for enhanced durability and making it suitable for larger diameter or high-production applications.

Applications

This versatile Flex-Hone tool is ideal for a broad spectrum of professional applications, including:

  • Automotive engine cylinders and block liners
  • Military and Aerospace components
  • Marine engines and hydraulic ram cylinders
  • General Industrial manufacturing and fluid power systems
  • Oil and Gas industry piping
  • Firearm and Musical Instrument finishing
  • Hydraulic cylinders and valve bodies
  • Aluminum extrusion and Earth Moving Equipment maintenance

Specifications

  • Manufacturer: Brush Research
  • Model Number: BSGBD31212
  • Product Name: FLEX HONE GBD 3-1/2 120SC
  • Type: Heavy Duty
  • Bore Capacity: 3-1/2 Inch Diameter
  • Overall Length: 13-1/2 Inch
  • Abrasive Type: Silicon Carbide
  • Grit Size: 120
  • Applicable Standard: ISO 9001
  • End Marking Color: Silver
Only 1 left in stock - order soon

$59.62

Free shipping on orders over $250
Lower 48 states and DC. Excludes freight and oversize items.
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This product was added to our catalog on Saturday 11 July, 2026.

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