Top 10 Forstner Bit Extender – Forstner Drill Bits

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1. Fulton

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Furniture, Fulton 6 inch Long Forstner Bit Extension for Adding Over 5-5/8 inches of Drilling Depth to Your Forstner Bit. for Wood Turners, Carpentry and Construction

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Fulton #ad - This means the set screws may protrude outwardly from the collet. This will help you create larger diameter starter holes or help when you need to drill in just a little further than the standard bit length will allow. The collet outside diameter is 25/32 inch without the set screws protruding outward.

Forstner bits and Machinery shown in pictures are NOT included. The collet inside diameter is 3/8 inch. It is designed to be used with forstner bits only. However, the extension works exceptionally well for projects like salt shakers, pepper mills or even wood turned beverage mugs. If you measure your bit shank and it is 3/8 inch, your bit should fit once the set screws are loosened. Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. To remedy this issue we have developed a heavy duty steel extension that allows you to secure a 3/8 inch shank forstner bit into the end collet.

The extension can be used with forstner bits on drill presses, lathes with a drill chuck installed drill chuck not included or with a power drill. The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. The minimum size hole this extension will allow you to drill is 13/16 inch. Drilling with forstner bits to achieve a flat bottom hole or to start a deep hole turning project like on a larger vase or vessel is essentially impossible with a standard length forstner bit.
BrandFulton #ad
ManufacturerFulton Woodworking Tools and Accessories #ad
Part Number927

2. Fulton

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Fulton 10 inch Long Forstner Bit Extension for Adding Over 8" of Drilling Depth to Your Forstner Bit Ideal for Wood Turners Furniture Carpentry and Construction 3/8 inch Collet

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Fulton #ad - One of the most common uses for the forstner bit extension is for woodturners who need to bore out starter holes on larger vessels. Drilling with forstner bits to achieve a flat bottom hole or to start a deep hole turning project like on a larger vase or vessel is essentially impossible with a standard length forstner bit.

This means the set screws may protrude outwardly from the collet. It is designed to be used with forstner bits only. The extension can be used with forstner bits on drill presses, lathes with a drill chuck installed drill chuck not included or with a power drill. The collet outside diameter is 25/32 inch without the set screws protruding outward. The collet inside diameter is 3/8 inch. Contractors use the extension when they need to bore deep holes for running cables or wires and they also use it for joining larger timbers.

The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. This will help you create larger diameter starter holes or help when you need to drill in just a little further than the standard bit length will allow. Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. The forstner bit extender is made from solid, heavy duty machined steel. The forstner bit extension gives you additional 8-1/2 inches of reach to bore deeper into your projects.
BrandFulton #ad
ManufacturerPeachtree Woodworking Supply Inc. #ad
Part Number200-2206
Model2206

3. IVY Classic

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High Carbon Steel, IVY Classic 46152 4-Inch Forstner Bit Extension, 1/Tube

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IVY Classic #ad - Two set screws and hex key included. Shank: 3/8-inch, length: 4-inch. Extends any forstner shank bit an additional 4 inches, Swift Bore Registered Trademark. Ideal for use with any 3/8" shank bit. To fasten the shank in place, use the hex key to tighten these screws. High-carbon steel construction, precision ground and polished.
BrandIVY Classic #ad
ManufacturerIVY Classic Industries #ad
Height0.63 Inches
Length4 Inches
Weight0.03 Pounds
Width0.63 Inches
Part Number46152
Model46152

4. MLCS

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MLCS 9270H 5-Inch Long Forstner Bit Extender with Hex Shank

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MLCS #ad - Item package dimension: 5. 0" l x 1. 0" w x 1. 0" h. Non slip Hex Shank. Drill flat Bottom Holes. High quality Steel.
BrandMLCS #ad
ManufacturerMLCS #ad
Height1 Inches
Length5 Inches
Weight0.02 Pounds
Width1 Inches
Part Number9270H
Model9270H

5. Fulton

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Fulton 10 inch Long Forstner Bit Extension for Adding Over 8" of Drilling Depth to Your Forstner Bit Ideal for Wood Turners Furniture Carpentry and Construction 1/2 inch Collet

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Fulton #ad - This will help you create larger diameter starter holes or help when you need to drill in just a little further than the standard bit length will allow. The extension can be used with forstner bits on drill presses, lathes with a drill chuck installed drill chuck not included or with a power drill.

The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. To remedy this issue we have developed an extra long, heavy duty steel extension that allows you to secure a 1/2 inch shank forstner bit into the end collet. Forstner bits and Machinery shown are NOT included. The minimum size hole this extension will allow you to drill is 15/16 inch. The collet inside diameter is 1/2 inch. One of the most common uses for the forstner bit extension is for woodturners who need to bore out starter holes on larger vessels.

Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. The forstner bit extender is made from solid, heavy duty machined steel. The forstner bit extension gives you additional 8-1/2 inches of reach to bore deeper into your projects. If you measure your bit shank and it is 1/2 inch, your bit should fit once the set screws are loosened. This tolerance is very tight and designed to accept forstner bits with shank sizes of 1/2 inch or slightly smaller.
BrandFulton #ad
ManufacturerPeachtree Woodworking Supply Inc. #ad
Part Number200-2205
Model2205

6. Century Drill & Tool

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3/8" Shank, Century Drill & Tool 38112 12" Ship Auger Extension

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Century Drill & Tool #ad - For use with ship auger bits with 3/8” hex shanks. Securely grips ship auger drill bits for extended length. 12" length. Extension’s shank fits ½" drill chucks.
BrandCentury Drill & Tool #ad
ManufacturerCentury Drill & Tool Corp #ad
Height0.75 Inches
Length12 Inches
Weight0.35 Pounds
Width0.75 Inches
Part Number38112
Model38112

7. Peachtree Woodworking Supply

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Carpentry and Construction Use 10" x 3/8" Extension for 3/8" Forstner Bits, 10” Long Forstner Bit Extension for Adding Over 8" of Drilling Depth to Your Forstner Bit. for Wood Turners, Furniture

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Peachtree Woodworking Supply #ad - The bits are secured with two hex socket set screws using a hex key wrench which is included. Unlike other brands of forstner bit extensions, this extension is non proprietary so they will work with most any brand of forstner bit. The 10” forstner bit extensions are available in two different shank diameters: 3/8” and ½”. This is often not enough of a depth for many of your projects and it can get quite frustrating without the proper tools.

Drilling with forstner bits to achieve a flat bottom hole or to start a deep hole turning project like a large vase or vessel can be very challenging with a standard length forstner bit. The extensions will work with hex shank or round shank forstner bits. To be certain, please make sure your bits fall into the correct socket size before purchasing. Can be used with hand drill as well. With the 10” long forstner bit extension you can now add over 8” of extra drilling depth to your current forstner bits! That alone makes this extension especially ideal for woodturners when having to hollow out large vessels or objects like salt and pepper shakers.

The extension also works great for rustic furniture, joining wide timbers, wooden beverage mugs and even works great on things like turned kaleidoscopes. This means that the 3/8” extension will accept 3/8” shank forstner bits while the ½” extension will accept ½” shank forstner bits. The 10” forstner bit extensions are made from heavy duty solid machined steel and feature a 3/16” thick socket wall to firmly hold the bits in place. Worse yet, even with a standard length extension you’ll probably only add about 3” of depth to your bit.
BrandPeachtree Woodworking Supply #ad
ManufacturerPeachtree Woodworking Supply inc. #ad

8. WOODRIVER

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3/8" x 4", Forstner Bit Extension

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WOODRIVER #ad - Extension adds 4” to length of forstner bit. Our award winning family of brands includes WoodRiver, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, planes, wood, kits, Highpoint, and plans.

Woodriver is proudly made by woodcraft, power tools, routers, sanding, wood stain and paint, america’s leading supplier of saws, hand tools, videos, dust collection and more. Socket accepts forstner bits with 3/8” diameter shanks. Designed for use with WoodRiver forstner bits only. Forstner bit held in extension socket with two set screws - 3/8” diameter drive shank allows use of multiple extensions.
BrandWOODRIVER #ad
ManufacturerWoodcraft Supply #ad
Height0.8 Inches
Length5.15 Inches
Weight0.26 Pounds
Width2.35 Inches
Part Number145705W

9. Irwin Tools

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Irwin Tools 42936 4-Inch Extension Bore Silver

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Irwin Tools #ad - Manufactured to exacting tolerances. Produces Flat Bottom Holes. Reduced shank fits 3/8-Inch and larger drills and drill presses. Brad point to Start Holes Cleanly. Sharp cutting edge for smooth holes.
BrandIrwin Tools #ad
ManufacturerIRWIN #ad
Height0.68 Inches
Length3.5 Inches
Weight0.12 Pounds
Width0.68 Inches
Part Number42936
Model42936

10. Alfa Tools

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Alfa Tools FB61492 3/8 x 5 1/8" Forstner Bit Extension

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Alfa Tools #ad - Forstner Bit Extension Shank. 3/8-inch barrel Inside Diameter. Quantity - 1 per Pack. Premium quality design. 5-1/8-inch overall Length, 3/8-inch Shank.
BrandAlfa Tools #ad
ManufacturerAlfa Tools #ad
Height0.63 Inches
Length5.13 Inches
Weight0.06 Pounds
Width0.63 Inches
Part NumberFB61492
ModelFB61492