How much above 4.25 will it expand?

Winbfred,The tool does not expend but is manufactured oversize. Thus if you measured the hone it would be more like 4.370" but you need oversize for the globules to be pressed against the bore for the honing action. If your bore is grater than 4.290" choose the 4-1/2" hone

I have a 94mm bore, will the 95mm tool work?

Should work with no problem. Most likely will get a better cleaning also.

What’s the difference in Gb and gbd

GBD is the commercial version with 80% more globules along the shaft. For sizes larger than 4-1/8" the only tool that is offered by Flex-hone is the GBD style.

what size do i need for a 4.040 bore? Thanks

4-1/8" is the correct hone , enter ASIN #B002XUL1GW for 240 grit version

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Brush Research GBD40024 FLEX-HONE®, 4" (101mm) Diameter, 240 Grit, Silicon Carbide, For Mild Steel, Stainless Steel Cast Iron and Softer Ferrous Materials

Product ID: 7528793

Details

Material
Silicon
Brand
Flex-Hone
Grit Material
Silicon
Bristle Type
Abrasive To
Compatible Material
Other Softer

🔧Versatile use

⚙️Precision finish

🇺🇸Made in USA

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$209.44

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Description

🔩 Elevate Your Finishing Game with Precision!

240 GRIT SILICON CARBIDE - Achieves a stunning finish of 24 - 32 Microinch.
VERSATILE TOOLING OPTIONS - Compatible with hand drills, drill presses, and CNC equipment.
ENGINEERED OVERSIZE DESIGN - Self-centering and self-aligning for effortless use.
MULTI MATERIAL COMPATIBILITY - Perfect for mild steel, stainless steel, and cast iron.
CROSSHOLE DEBURRING CAPABILITY - Finish and deburr in one go, saving you time.

The Brush Research GBD40024 FLEX-HONE® is a high-quality, USA-made honing tool designed for precision finishing on a variety of materials, including mild steel and stainless steel. With its engineered oversize design and 240 grit silicon carbide abrasive, it ensures a flawless crosshatch finish while allowing for simultaneous finishing and deburring. This versatile tool is compatible with various rotating spindles, making it an essential addition to any professional's toolkit.

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