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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 4-1/8" (105mm)…
Flex-Hone

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass - main product image
All-inclusive price — duties & taxes paid, no customs charges at delivery
₹23,350₹33,900

You save ₹10,550 (31%)

Qty
Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass — 3.750" (95mm)
3.750" (95mm)
₹21,240
₹34,130
In Stock
Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass — 4.125" (105mm)
4.125" (105mm)
₹23,350
₹33,900
In Stock

Estimated doorstep delivery by 21 Nov - 23 Nov from USA

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High-Quality Honing at Competitive Price

About this item

Flex-Hone 4-1/8" (105mm) diameter, 320 grit aluminum oxide abrasive. Designed for deglazing and finishing aluminum, brass, bronze cylinders. Self-centering, with rapid ring seating, it creates a cross hatch pattern and true plateau finish, improving oil control and seal life.

Manufactured by Brush Research, this tool is engineered oversized for optimal pressure, self-aligning, and suitable for use with hand drills, CNC, or drill presses. Its abrasive globules bonded to flexible nylon filaments ensure consistent results across various applications including automotive, hydraulic, and pneumatic cylinders, as well as deburring cross drilled holes and edge blending.

Imported from the USA, it arrives factory-sealed, with all duties included, and is ideal for professional workshops and automotive repair shops in India seeking reliable, high-quality honing tools.

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.
  • 320 GRIT ALUMINUM OXIDE ABRASIVE — Excellent on Aluminum, Brass, Bronze, and softer non-ferrous materials. 240 AO is commonly used for deglazing Nikasil cylinders. Typically achieves a finish of 18 - 30 Microinch (.5 - .7 Micrometer).
  • WHAT'S INCLUDED — 1 Each of a GB Standard Duty FLEX-HONE: 4.125" (105mm) Bore Diameter, 4" Abrasive Part Length, 0.310" Shank Diameter, 13.5" Overall Length. For Use on Bore Diameters Between 3.751"-4.125". PLEASE NOTE: ORDER BY BORE SIZE.

Why choose this product

Superior Finish & Rapid Ring Seating

Brush Research's FLEX-HONE® uses abrasive globules bonded to nylon filaments, producing a consistent cross hatch pattern that enhances oil retention and seal performance. Its self-aligning design ensures uniform results, reducing machining time and improving cylinder longevity.

Ideal for Automotive & Hydraulic Applications

Designed for deglazing and finishing cylinders, valve guides, and brake components, it accelerates ring seating and improves seal life. Skip if working on ferrous metals requiring higher grit or different abrasive types.

How to use

  • Select the Correct Bore Size — Measure your cylinder bore accurately and choose a flex-hone with a diameter matching or slightly oversized for self-centering fit.
  • Attach to Power Tool — Connect the flex-hone to a compatible drill or CNC spindle, ensuring the shank fits securely for safe operation.
  • Operate at Recommended Speed — Run the tool at 500-1200 RPM, applying steady pressure. Use honing oil for best results and avoid excessive force.
  • Finish & Clean — Hone until desired finish is achieved, then clean the cylinder thoroughly to remove abrasive debris and oil residues.

Example scenarios

Typical situations where Flex-Hone 4-1/8" (105mm) Diameter helps — illustrative scenarios, not customer reviews.

1
Scenario 1
Illustrative example
Where it helps

An automotive workshop in Mumbai needs to deglaze aluminum engine cylinders efficiently.

How this product helps

Using the flex-hone, they achieve a smooth cross hatch finish, reducing rework and improving seal life, saving costs on repairs.

2
Scenario 2
Illustrative example
Where it helps

A hydraulic repair shop in Delhi deburrs cross drilled holes in valve bodies.

How this product helps

The tool's versatility allows deburring and finishing in one step, with quick turnaround and consistent results, reducing downtime.

Specifications

Composition

Abrasive MaterialAluminum Oxide

Usage

Recommended Bore Size3.75" - 4.125"
Recomm. Speed500-1200 RPM
Shelf LifeFactory-sealed, use within 12 months of opening
Cost per use₹23,350 per count
Reapplication DurationLasts for multiple cylinders, depends on use
Suitable ForAluminum, Brass, Bronze, Non-Ferrous Metals

How we compare

FeatureFlex-Hone 4-1/8" (105mm)Others
Material CompatibilityOptimized for aluminum, brass, bronze, softer non-ferrous metalsTypically designed for ferrous metals, limited grit options
Finish QualityProduces a true plateau finish with cross hatch pattern, microinch 18-30May produce uneven surface, lower oil retention
Self-Centering & Ease of UseEngineered oversized, self-aligning, no elaborate setup neededRequires manual adjustment, less consistent results
Price per Use₹23,350 per countVaries by brand, typically ₹300-₹700 per cylinder

Product details

SKUjsh4350
GTIN0843469144300
BrandFlex-Hone
Model NumberGB418320AO
Diameter4.125" (105mm)
Grit320 Grit
MaterialAluminum Oxide

About Flex-Hone

Brush Research Manufacturing pioneered plateau honing in 1972, delivering precision tools for automotive and industrial applications worldwide.

Compliance & Legal

This is a professional abrasive tool, not a medical device. No certifications required.

Customer Reviews

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FAQ, See What Others Asked

How do I choose the correct diameter flex-hone for my cylinder?
Order the Flex-Hone matching your actual bore size. The tool is oversized for self-centering, fitting bore diameters from 3.75" to 4.125" for optimal pressure and finish.
Which grit size is best for engine cylinder deglazing?
A 320 grit aluminum oxide abrasive is suitable for deglazing aluminum cylinders, achieving a finish of 18-30 Microinch, ideal for piston ring seating and oil retention.
Can I use this flex-hone on other materials?
Yes, it works well on aluminum, brass, bronze, and softer non-ferrous metals. Avoid using on ferrous metals requiring higher grit or different abrasive types.
How long does the tool last?
The flex-hone is self-compensating for wear, with a typical lifespan across multiple cylinders. Factory-sealed, it should be used within 12 months of opening for best results.
Is this tool suitable for deburring holes?
Yes, it effectively deburrs cross drilled holes, radiuses edges, and blends surfaces, making it versatile for automotive and industrial applications.
How quickly will I receive my order in India?
Your order ships via ExpressBox, arriving in 11-13 days. All duties and taxes are included, ensuring a smooth import process.

Frequently bought together

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass

This item:

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass

₹23,350

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass

This item

Flex-Hone 4-1/8" (105mm) Diameter, 320 Grit Aluminum Oxide | Self-Centering Deburring Tool for Aluminum & Brass

₹23,350

Total price:

₹40,460

You save ₹16,760 (29%) Extra

3 items selected

3 items

₹40,460

You save ₹16,760 (29%) Extra

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₹23,350
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Brand NameFlex-HoneFlex-HoneFlex-HoneFlex-HoneFlex-HoneAlphaTRAKSmartSign
SourceUS RetailUS RetailUS RetailUS RetailUS RetailUS RetailUS Retail
Sold ByCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrow
Imported from USA
₹23,350₹33,900

You Save ₹10,550

Estimated doorstep delivery by 21 Nov - 23 Nov from USA
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Your Order Journey: From Purchase to Doorstep

You Order
Place your order
USA Warehouse dispatch
Packed & shipped
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Fast transit
Consignment to India Warehouse
Customs cleared
Doorstep delivery
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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
₹70,050+ (3× the price)
₹23,350 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