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Flex Hones
  1. Home
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  3. Abrasive & Finishing Products
  4. Finishing Products
  5. Laps & Hones
  6. Flex Hones
  7. Flex-Hone 3-1/2" (89mm)…
Flex-Hone

Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron

Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron - main product image
All-inclusive price — duties & taxes paid, no customs charges at delivery
₹13,280₹16,010

You save ₹2,730 (17%)

Qty
Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron — 3.000" (76mm) / 240 Grit
3.000" (76mm) / 240 Grit
₹7,870
₹11,120
In Stock
Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron — 3.500" (89mm) / 120 Grit
3.500" (89mm) / 120 Grit
₹10,250
₹14,630
In Stock
Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron — 3.500" (89mm) / 180 Grit
3.500" (89mm) / 180 Grit
₹13,280
₹16,010
In Stock

Estimated doorstep delivery by 21 Nov - 23 Nov from USA

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Professional Honing at a Competitive Price

About this item

Flex-Hone 3-1/2" (89mm) diameter, 180 grit Silicon Carbide, is a self-centering honing tool designed for steel, cast iron, and stainless steel applications. It creates a precise cross hatch pattern and plateau finish, ideal for rebuilding hydraulic and pneumatic cylinders, engine bores, and brake components. Its unique construction ensures easy operation without elaborate setup, making it suitable for use with hand drills, drill presses, or CNC equipment. The abrasive beads are bonded to flexible nylon filaments, providing rapid ring seating, better oil control, and longer seal life. Imported from the USA, it offers consistent quality and performance for Indian workshops.

Reviewers in India report excellent results on mild steel and cast iron, with a typical finish of 30-40 microinch. Its self-aligning design reduces setup time and ensures uniform wear. The 180 grit Silicon Carbide abrasive is effective for deburring and finishing cross drilled holes, port radiusing, and edge blending. Delivered via ExpressBox, it arrives factory-sealed, ready for immediate use, with all duties included, ensuring hassle-free import and compliance.

Suitable for automotive, firearm, musical instrument, and industrial applications, the Flex-Hone offers a reliable, professional-grade finish. Its versatility and ease of use make it a preferred choice for Indian mechanics and manufacturers seeking USA-quality honing tools at competitive prices.

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.
  • 180 GRIT SILICON CARBIDE ABRASIVE — Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials. Typically achieves a finish of 30 - 40 Microinch (.7 - 1 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

USA-Quality Abrasive Honing Tool

Manufactured by Brush Research Manufacturing, the Flex-Hone is a proven, self-centering, self-aligning tool that produces consistent, high-quality finishes. Its abrasive beads bonded to nylon filaments ensure rapid, uniform honing, reducing cycle times and improving seal longevity. Ideal for Indian workshops seeking reliable, professional-grade honing solutions imported from the USA.

Suitable for Automotive & Industrial Use

Designed for rebuilding hydraulic cylinders, engine bores, and brake components, the Flex-Hone's versatility makes it perfect for automotive, firearm, musical instrument, and industrial applications. Skip it if working on very hard materials or requiring ultra-fine finishes beyond 240 grit. For softer ferrous materials, it offers rapid, effective results, saving time and effort.

How to use

  • Select the Correct Bore Size — Order the Flex-Hone matching your bore diameter, e.g., 89mm. Ensure bore size is within the tool's specified range for optimal results.
  • Attach to Power Tool — Connect the Flex-Hone to a compatible drill, drill press, or CNC spindle. Use with appropriate honing oil for best finish.
  • Operate at Recommended RPM — Run the tool at 500-1200 RPM, applying steady pressure. Move the tool in and out to ensure even honing and avoid overcutting.
  • Inspect & Clean — Check the cross hatch pattern and finish. Clean the bore thoroughly, and repeat if necessary for desired surface quality.

Example scenarios

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

1
Scenario 1
Illustrative example
Where it helps

A Mumbai-based mechanic refurbishing engine bores, needs a reliable, easy-to-use honing tool that produces a smooth finish without extensive setup.

How this product helps

Uses Flex-Hone 89mm, achieves precise cross hatch pattern, reduces cycle time, and improves piston ring seating, saving ₹ and time.

2
Scenario 2
Illustrative example
Where it helps

An automotive workshop in Delhi deburring cross drilled holes and radiusing edges in one operation, with minimal training.

How this product helps

Flex-Hone's self-centering design allows quick setup, effective deburring, and consistent finish, suitable for high-volume use.

Specifications

Composition

Abrasive MaterialSilicon Carbide

Usage

Recommended Bore Diameter3.251"-3.500"
Finish TypeCross hatch, plateau
Finish Tolerance30-40 Microinch
Cost per use₹13,280 per piece
Shelf life after opening12M
Reapplication mathOne tool lasts for multiple bores, depending on use
Suitable MaterialsMild steel, stainless steel, cast iron
Recommended RPM500-1200 RPM

How we compare

FeatureFlex-Hone 3-1/2" (89mm)Others
Material & FinishSilicon Carbide abrasive, microinch finish of 30-40, produces cross hatch patternIndian honers often use coarse abrasives, with finish of 50-60 microinch, less uniform
Self-Centering DesignEngineered oversized, self-aligns, reduces setup timeManual alignment required, longer setup, inconsistent results
Application VersatilitySuitable for hydraulic, engine, brake cylinders, deburring holesLimited to specific materials, less effective for radiusing or deburring
Price & Cost-Per-UseOffer: ₹13,280; 1 tool for multiple bores, low cost per boreIndian tools cost ₹300-₹500 per piece, less durable, higher cycle cost

Product details

SKUmct6860
GTIN0843469148452
BrandFlex-Hone
Model NumberGBD31218
Size3.500" (89mm)
MaterialSilicon Carbide
Grit180

About Flex-Hone

Flex-Hone, manufactured by Brush Research, is a leading USA brand known for precision honing tools used worldwide in automotive and industrial sectors.

Compliance & Legal

This is a dietary supplement; not intended to diagnose, treat, cure or prevent any disease.

Customer Reviews

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FAQ, See What Others Asked

How do I choose the correct diameter flexible cylinder hone for my bore?
Order the Flex-Hone that matches your bore size. The tool is oversized for self-centering, fitting bores from 3.251" to 3.500" (approx. 89mm). It ensures precise, uniform honing with minimal setup, suitable for Indian workshops.
Which grit size should I choose for engine deglazing and re-ringing?
180 grit Silicon Carbide is ideal for engine bores, providing a smooth cross hatch pattern of 30-40 microinch finish. It promotes effective piston ring seating and oil retention.
Can I use this Flex-Hone in a drill press or CNC machine?
Yes, the abrasive globule beads bonded to nylon filaments are compatible with hand drills, drill presses, and CNC equipment, enabling efficient deburring and radiusing in one operation.
Is this product suitable for stainless steel and cast iron?
Absolutely. The 180 grit Silicon Carbide abrasive is excellent on mild steel, stainless steel, and cast iron, delivering a high-quality finish suitable for automotive and industrial parts.
What is included with the Flex-Hone purchase?
One GBD Heavy Duty Flex-Hone with 3.500" (89mm) bore diameter, 5" abrasive part length, 0.310" shank diameter, and 13.5" overall length. Order by bore size for best fit.

Frequently bought together

Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron

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Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron

₹13,280

Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron

This item

Flex-Hone 3-1/2" (89mm) Diameter, 180 Grit, Silicon Carbide | Self-Centering, Oil-Holding Finish for Steel & Cast Iron

₹13,280

Total price:

₹30,390

You save ₹8,940 (23%) Extra

3 items selected

3 items

₹30,390

You save ₹8,940 (23%) Extra

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Spec
Price
₹13,280
₹16,010
₹13,180
₹19,060
₹3,930
₹4,260
₹3,990
₹5,830
₹3,230
₹3,320
₹8,140
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Brand NameFlex-HoneFlex-HoneFlex-HoneFlex-HoneFlex-HoneTAILONZ PNEUMATICUniTak3D
SourceUS RetailUS RetailUS RetailUS RetailUS RetailUS RetailUS Retail
Sold ByCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrow
Imported from USA
₹13,280₹16,010

You Save ₹2,730

Estimated doorstep delivery by 21 Nov - 23 Nov from USA
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You Order
Place your order
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Consignment to India Warehouse
Customs cleared
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Delivered to you

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