Have a 67.40 bore steel sleeve. What size and grit

For your 67.4mm application with steel sleeve, enter this ASIN number in the amazon search bar: B002N36MOA this is 240 a 240 grit hone for stock rebuilds. If your application is a high rev engine with Moly or Chrome faced top ring ring-set, then 320 grit is preferred. For the 320 grit version, enter this ASIN in the Amazon search bar: B002SAMS1E Plenty in stock for immediate shipment.

Delivery time for Mexico?

About a week or so. Our price is for 2pcs, not 1pc.

Can this hone be used for chainsaw cylinders? Are these aluminum oxide?

Answer to Question No. 1: Yes, am SURE that Brush Research Flex-Hones CAN be used to hone chainsaw motor cylinder bores.....We use Flex-Hones for various operations in Our efforts to RE-build & restore 1930's & '40's "Vintage"-style, HIGH-Performance, Ford FlatHead-V8 engines, including: Our automotive machinist "Hones" cylinders in cast iron ENG blocks w/ Flex Hones, after actual cylinder boring. We hone lifter bores & valve bowls w/ Flex-Hones, and do final polishing of intake & exhaust runners, valve & exhaust ports, after doing initial "Porting" work with stones & burrs mounted on die-grinders & dremels--work which We do for Ourselves in Our own, private shop. Have also used Flex-Hones to polish MISC bores, of various sizes, in antique Ford cast iron cylinder heads (e.g.: Model A & B Distributor Housing ports), AND to polish venturi bores in cast iron bases of antique Ford Stromberg carburetors..... Answer to Question No. 2: Brush Research manufactures Flex-Hones w/ abrasive "balls" made of BOTH Aluminum AND Silicon Oxide, in a broad variety of "Grit" ratings/grades. I would STRONGLY SUGGEST contacting "Tech-Support" at Brush Research Co., tell a Technician what Your SPECIFIC project application is, type of metal You are working on, etc, Etc, and get THEIR recommendation(s) for either Aluminum Or Silicon Oxide, "Grit" grade to use, and so-on---AGAIN: Based on YOUR specific job/project application & requirements. GOOD LUCK & HAPPY NEW Year!! RLR

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Brush Research Manufacturing - BC23424 FLEX-HONE Cylinder Hone, BC Series, Silicon Carbide Abrasive, 2-3/4" (70 mm) Diameter, 240 Grit Size

Brush Research Manufacturing - BC23424 FLEX-HONE Cylinder Hone, BC Series, Silicon Carbide Abrasive, 2-3/4" (70 mm) Diameter, 240 Grit Size

Product ID: 148611499

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Details

Material
Aluminum Oxide
Brand
Flex-Hone
Grit material
Silicon
Bristle type
flexible nylon
Colour
Black

📏Fits bores from 4mm up to 36 inches

🔄Self-centering, self-aligning, wear-compensating design

⚙️240 grit silicon carbide for precision finish

Description

🔧 Elevate your cylinder finish game—because flawless surfaces mean flawless performance.

PRECISION SURFACE REFINEMENT - 240 grit silicon carbide beads deliver a flawless plateau finish that optimizes oil retention and seal longevity.
UNIVERSAL BORE COMPATIBILITY - Available in sizes from 4mm to 36 inches, ensuring a perfect fit for any cylinder or cross-hole application.
STREAMLINED WORKFLOW INTEGRATION - Combines deburring and finishing in one step, enabling faster ring seating, reduced seepage, and extended seal life.
VERSATILE INDUSTRIAL APPLICATIONS - Ideal for automotive cylinders, firearm chambers, air compressors, pumps, and more—boosting performance across industries.
EFFORTLESS ALIGNMENT WEAR COMPENSATION - Innovative self-centering and self-aligning design means no complex setup or special training required—perfect for both hand and CNC use.

The Brush Research Manufacturing BC23424 FLEX-HONE is a 2.75-inch diameter silicon carbide abrasive cylinder hone with 240 grit size, engineered for precision surface finishing and cross-hole deburring. Its self-centering, self-aligning, and wear-compensating design allows seamless use by hand or CNC, fitting bore sizes from 4mm to 36 inches. Originally designed for automotive cylinder deglazing, it now serves diverse industrial applications, delivering superior oil retention, faster ring seating, and longer seal life with minimal setup.

Specifications

Grit type	240
Unit count	1.0 Count
Number of pieces	1
Recommended uses for product	Deburring, Finishing
Manufacturer	Brush Research Mfg.
UPC	843469124791
Item diameter	2.75 Inches
Part number	BC23424
Item Weight	190 g
Item model number	BC23424
Size	2-3/4"
Style	240 Grit
Item Package Quantity	1
Cutting Diameter	2.75 Inches
Measurement System	Inch
Grit Number	240
Included components	BC 2-3/4" (70MM) 240SC FLEX-HONE
Batteries included?	No
Batteries Required?	No

Reviews

P**L

Brilliant

Superb quality did an excellent job

4.05.2023

S**S

Great for use on Two Strokes!

Bought to clean up the bores on a 1974 Kawasaki S3 Triple (400cc). I was worried that conventional stones would jam in the ports.Bought this and it did a fantastic job! It’s a tight fit and you fling oil everywhere when using - but it does a splendid job and leaves a perfect crosshatch pattern of light hone marks.Watch the videos first and be prepared for major clean-up of work-piece, bench, ceiling, you……

28.11.2021

S**S

great staff.

Good staff ,higly recommended.

5.10.2019

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