Top 8 Forstner Bit Extension – Forstner Drill Bits

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1. Fulton

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

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Fulton #ad - The collet outside diameter is 25/32 inch without the set screws protruding outward. 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. 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.

It is designed to be used with forstner bits only. Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. However, the extension works exceptionally well for projects like salt shakers, pepper mills or even wood turned beverage mugs. 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. One of the most common uses for the forstner bit extension is for woodturners who need to bore out starter holes on larger vessels.

Forstner bits and Machinery shown in pictures are NOT included. The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. This tolerance is very tight and designed to accept forstner bits with shank sizes of 3/8 inch or slightly smaller. 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 forstner bit extension gives you additional 5-5/8 inches of reach to bore deeper into your projects.
BrandFulton #ad
ManufacturerFulton Woodworking Tools and Accessories #ad
Part Number927

2. IVY Classic

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

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

3. 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 - Forstner bits and Machinery shown in pictures are NOT included. If you measure your bit shank and it is 3/8 inch, your bit should fit once the set screws are loosened. The forstner bit extender is made from solid, heavy duty machined steel. 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.

It is designed to be used with forstner bits only. This tolerance is very tight and designed to accept forstner bits with shank sizes of 3/8 inch or slightly smaller. However, the extension works exceptionally well for projects like salt shakers, pepper mills or even wood turned beverage mugs. The collet outside diameter is 25/32 inch without the set screws protruding outward. The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. 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 an extra long, heavy duty steel extension that allows you to secure a 3/8 inch shank forstner bit into the end collet. The forstner bit extension gives you additional 8-1/2 inches of reach to bore deeper into your projects. 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. 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.
BrandFulton #ad
ManufacturerPeachtree Woodworking Supply Inc. #ad
Part Number200-2206
Model2206

4. Irwin Tools

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Irwin Tools 42936 4-Inch Extension Bore

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

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 - 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. Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. The collet outside diameter is 29/32 inch without the set screws protruding outward.

One of the most common uses for the forstner bit extension is for woodturners who need to bore out starter holes on larger vessels. The forstner bit extender is made from solid, heavy duty machined steel. 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. However, the extension works exceptionally well for projects like salt shakers, pepper mills or even wood turned beverage mugs. 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. The collet inside diameter is 1/2 inch. The forstner bit extension gives you additional 8-1/2 inches of reach to bore deeper into your projects. The minimum size hole this extension will allow you to drill is 15/16 inch. 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.
BrandFulton #ad
ManufacturerPeachtree Woodworking Supply Inc. #ad
Part Number200-2205
Model2205

6. Peachtree Woodworking Supply

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Furniture, Carpentry and Construction Use 10" x 1/2" Extension for 1/2" Forstner Bit, 10” Long Forstner Bit Extension For Adding Over 8" of Drilling Depth To Your Forstner Bit. For Wood Turners

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Peachtree Woodworking Supply #ad - This is often not enough of a depth for many of your projects and it can get quite frustrating without the proper tools. 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 extensions will work with hex shank or round shank forstner bits. Can be used with hand drill as well. 1/2" extension will only work with 1/2" drill chucks. The 10” forstner bit extensions are available in two different shank diameters: 3/8” and ½”. To be certain, please make sure your bits fall into the correct socket size before purchasing. The bits are secured with two hex socket set screws using a hex key wrench which is included. 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.

Unlike other brands of forstner bit extensions, this extension is non proprietary so they will work with most any brand of forstner bit. Worse yet, even with a standard length extension you’ll probably only add about 3” of depth to your bit. This means that the 3/8” extension will accept 3/8” shank forstner bits while the ½” extension will accept ½” shank forstner bits. 10” long by ½” extension has an inner diameter of ½” and an outer diameter 57/64” and works with bits 15/16” in diameter or larger.
BrandPeachtree Woodworking Supply #ad
ManufacturerPeachtree Woodworking Supply inc. #ad

7. Century Drill & Tool

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Century Drill & Tool 38112 12" SHIP Auger Drill Bit Extension, 3/8"

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Century Drill & Tool #ad - 12" length. Extension’s shank fits ½" drill chucks. Securely grips ship auger drill bits for extended length. For use with ship auger bits with 3/8” hex shanks.
BrandCentury Drill & Tool #ad
ManufacturerCentury Drill & Tool Corp #ad
Height0.75 Inches
Length12 Inches
Weight0.84 Pounds
Width0.75 Inches
Part Number38112
Model38112

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