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Flex Hones
  1. Home
  2. Industrial & Scientific
  3. Abrasive & Finishing Products
  4. Finishing Products
  5. Laps & Hones
  6. Flex Hones
  7. Flex-Hone GBD31212 3-1/2"…
Flex-Hone

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron - main product image
All-inclusive price — duties & taxes paid, no customs charges at delivery
₹9,780₹14,630

You save ₹4,850 (33%)

33% off the seller list price

Qty
Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron — 3.500" (89mm)
3.500" (89mm)
₹9,780
₹14,630
In Stock

Estimated doorstep delivery by 11 Nov - 13 Nov from USA

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Achieve Precision Finishing at Cost-Effective Rates

About this item

Flex-Hone GBD31212 is a high-quality abrasive tool imported from the USA, designed for precise honing of cylinders in automotive and industrial applications. Its 3.5 inch (89mm) diameter and 120 grit silicon carbide abrasive ensure a smooth, crosshatch finish, reducing sealing issues and improving oil control.

The flexible bead-style abrasive globules are bonded to nylon filaments, making the tool self-centering and easy to use in various rotating spindles, from hand drills to CNC machines. Its engineered oversize creates optimal pressure, ensuring uniform wear and consistent results. Reviewers in India report excellent finish quality on mild steel and cast iron, with faster ring seating and better seal longevity.

Imported directly from the USA, the Flex-Hone GBD31212 offers reliable quality and performance. It arrives in 11-13 days, with all duties included, making it a cost-effective choice for professional workshops and OEMs seeking a durable, high-performance honing solution in India.

Key Features

  • QUALITY — Proudly Made in the USA. Quality and consistency you can count on made from the inventors and makers of the tool.
  • DESIGN — The FLEX-HONE is intentionally manufactured oversized. This engineered oversize creates the optimal amount of pressure inside the cylinder wall allowing the tool to be self-centering, self-aligning and self-compensating for wear and easy use.
  • FINISHING BENEFITS — Offered in a wide variety of grits to achieve specific finishing tolerances as well as a beautiful crosshatch finish. Ideal for rebuilding hydraulic and pneumatic cylinders, engine and brake cylinders, valve guides, pumps, compressors and more.
  • CROSSHOLE DEBURRING — Accomplish finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle from a hand drill, drill press or CNC equipment.
  • 120 GRIT SILICON CARBIDE ABRASIVE — Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 35 - 50 Microinch (.9 - 1.4 Micrometer).
  • WHAT'S INCLUDED — 1 Each of a GBD Heavy Duty FLEX-HONE: 3.500" (89mm) Bore Diameter, 5" Abrasive Part Length, 0.310" Shank Diameter, 13.5" Overall Length. For Use on Bore Diameters Between 3.251"-3.500". PLEASE NOTE: ORDER BY BORE SIZE.

Why choose this product

Superior Finish & Rapid Ring Seating

Brush Research's FLEX-HONE® technology produces a consistent plateau finish, reducing sealing and oil seepage issues. Its abrasive beads are bonded for durability, enabling faster, cleaner honing with minimal setup.

Ideal for Automotive & Industrial Use

Designed for professionals in India, this tool improves cylinder sealing, extends seal life, and enhances engine performance. Skip if working on softer non-ferrous metals or delicate components.

How to use

  • Select the Correct Bore Size — Measure your cylinder bore accurately and choose a flex hone slightly oversized for optimal pressure and finish. Install in your drill or CNC spindle.
  • Apply Honing Fluid & Operate — Use honing oil or light lubricant. Run the tool at moderate RPMs, moving axially to create a crosshatch pattern. Recheck finish periodically.
  • Finish & Clean — Once desired finish is achieved, clean the cylinder thoroughly. Inspect for uniformity. The tool can be reused until abrasive globules wear out.

Example scenarios

Typical situations where Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide helps — illustrative scenarios, not customer reviews.

1
Scenario 1
Illustrative example
Where it helps

An automotive workshop in Mumbai needs to hone engine cylinders quickly and accurately.

How this product helps

Using the Flex-Hone GBD31212, the workshop achieves a smooth plateau finish, reduces honing time, and improves seal longevity, arriving in 11-13 days.

Specifications

Composition

AbrasiveSilicon Carbide

Usage

Recommended Bore Size3.251" - 3.500"
Cost per use₹9,780 per piece
Shelf life after openingUnspecified
Reapplication durationMultiple uses per tool depending on wear
Suitable forCylinder honing, deburring, radiusing
Use withHand drill, drill press, CNC

How we compare

FeatureFlex-Hone GBD31212 3-1/2"Others
Material & FinishSilicon Carbide abrasive, produces a true plateau finish, faster ring seatingIndian-made abrasives, variable finish quality, longer honing time
Size Range3.5 inch (89mm), engineered oversized for optimal pressureStandard sizes, less precise pressure control
Application VersatilitySuitable for cylinders, deburring, radiusing in industrial settingsLimited application scope, often non-automotive
Durability & PerformanceSelf-centering, wear-compensating, durable bondingLess durable, inconsistent wear

Product details

SKUerm8421
GTIN0843469148407
BrandFlex-Hone
Size3.500" (89mm)
Grit120
MaterialSilicon Carbide
PatternBrush Research

About Flex-Hone

Brush Research Manufacturing pioneered plateau honing technology in 1972, establishing a global reputation for durable, high-performance abrasive tools.

Compliance & Legal

This is a professional abrasive tool; handle with care. No specific safety warnings. Imported from USA, complies with Indian import regulations.

Customer Reviews

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FAQ, See What Others Asked

How do I select the right size flex hone for my engine cylinder?
Order the flex hone sized to your cylinder's actual bore diameter. The tool is manufactured oversized to ensure proper contact and finish, arriving in 11-13 days.
Can flexible ball hones be used with standard power drills?
Yes, the FLEX-HONE GBD31212 features a standard shank compatible with most drills and CNC machines, providing a true plateau finish in a single setup.

Frequently bought together

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron

This item:

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron

₹9,780

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron

This item

Flex-Hone GBD31212 3-1/2" (89mm) Diameter | Silicon Carbide, 120 Grit, For Mild Steel & Cast Iron

₹9,780

Total price:

₹17,090

You save ₹6,050 (26%) Extra

3 items selected

3 items

₹17,090

You save ₹6,050 (26%) Extra

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Spec
Price
₹9,780
₹14,630
₹5,930
₹6,590
₹1,380
₹1,920
₹2,330
₹3,110
₹1,680
₹2,440
₹3,570
₹4,860
₹34,930
₹51,400
Brand NameFlex-HoneFlex-HoneHIGH TECH INSTRUMENTSYOKIVEDMiotechELEGOOOxivir
SourceUS RetailUS RetailUS RetailUS RetailUS RetailUS RetailUS Retail
Sold ByCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrow
Imported from USA
₹9,780₹14,630

You Save ₹4,850

Estimated doorstep delivery by 11 Nov - 13 Nov from USA
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Your Order Journey: From Purchase to Doorstep

You Order
Place your order
USA Warehouse dispatch
Packed & shipped
International Air Shipping
Fast transit
Consignment to India Warehouse
Customs cleared
Doorstep delivery
Delivered to you
You Order
Place your order
USA Warehouse dispatch
Packed & shipped
International Air Shipping
Fast transit
Consignment to India Warehouse
Customs cleared
Doorstep delivery
Delivered to you

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vs
₹29,340+ (3× the price)
₹9,780 locked, all-in
Hard to get the original US version in India
Original US version, shipped to your door
Extra pay for Import Duties, GST, and forex fees
One price in INR, no customs charges at delivery
4–12 weeks · No tracking
11-13 days · live tracking
Grey market, no guarantee, no protection, no refund
Sourced from US retailers, India-verified, return available
Lost in transit = ₹0 back
Full protection included