Overview
These professional quality carbide tipped bits are designed to drill flat-bottomed holes. Use with a drill press, or with a hand drill and our exclusive JIG IT® Drill Guide (#91981, sold separately). All Forstner bits have a 3/8" diameter shank and require a 3/8" stop collar if used with the JIG IT Drill Guide. These long shanks are 3-7/8" long.
Features:
- Bits feature carbide tips for enhanced durability
- Designed with spiraled flutes to allow for fast chip removal
- All bits have a 3/8" diameter shank
Frequently Bought Together
Questions and Answers
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Browse 4 questions
and 48 answers
Why did you choose this?
Rockler Store
Needed something close to 1.74" in diameter, & heard of Rockler.
Wesley B
on May 13, 2017
NEED LONG SHANKED BIT.
Scott M
on Feb 17, 2017
Needed something close to 1.74" in diameter, & heard of Rockler.
Wesley B
on May 13, 2017
To mate with just-purchased Jig-It drill guide for a specific project
Jeff B
on May 1, 2017
To mate with just-purchased Jig-It drill guide for a specific project
Jeff B
on May 1, 2017
Needed long shank for cross drilling on some of my toy truck body sections for axles. This is just big enough for my Red Oak 1/4" axle shaft to turn freely without slop. I had worn out my High Carbon ones so I switched to Carbide on my most used ones.
ROD E
on Jan 28, 2017
Exactly how long is the 3/4" bit? I need to drill a hole in an oak mantle about 6 inches deep using my drill press.
BEST ANSWER: It's 4 3/4 inch you can buy an extension that's 4 inches that should work for you total would be about 8 inches!
- Reply
- Inaccurate
- Robert M on Jul 10, 2015
- Purchased on Apr 4, 2015
how long is the shank on the 1 1/4 inch long shank carbide forstner bit, how deep can I drill?
BEST ANSWER: From the end of the shank to the front of the cutter face is 4 5/8 inches.
You should know, though, that there are extenders that you can get to allow you to drill deeper.
You should know, though, that there are extenders that you can get to allow you to drill deeper.
- Reply
- Inaccurate
- Mark U on May 22, 2017
- Purchased on Jun 3, 2015
how long is the 1/4 " bit? need to drill to 3 5/8" thanks
BEST ANSWER: I have a 3/4" long-shaft forstner. Its overall length is 4-11/16 not counting the center point.
- Reply
- Inaccurate
- Chas M on Jul 12, 2017
- Purchased on Aug 3, 2015
Reviews
4.1 / 5.0
18 Reviews
Long Shank Carbide Forstner Bits
These bits cut cleanly and accurately requiring very little sanding when used for design detailing. In retrospect I would buy a whole set to begin with if they sold them that way..
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Undersize Forstner Bit
I purchased 91904. What I thought was a 2" dia. Turned out to be 1.969 diameter, 1/32" too small. Had to turn down the diameter of mating part. Time consuming and annoying!
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April 10, 2014
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I've used a lot of Forstner...
I've used a lot of Forstner bits over years, and these are without a doubt the best I've used. They cut fast and clean, stay sharp, and are really a joy to use. It's hard to get excited about a drill bit, but you will about these! Incidentally, a piece of carbide cracked off on one of the bits after about 10 months of use, and Rockler replaced the bit with no problems. Great bit, great customer service - what more can you ask?!
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August 23, 2013
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Forstner bit
I needed to cut away some wood but not right through and keep it at the same level. So I bought this to use on my bench drill press. It worked well. A smoother bottom would have been better this has a spike in the middle for centering. I know I can use a router but I don't have one yet.
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A pleasure to use this bit.
This bit cut a very smooth hole and worked fast. I used it on sheet lumber and had no problems with the layers
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Works as stated, shaft is soft and tears up in the chuck. The shank needs to be hardened to at least 60 Rockwell C for at least 2 inches.
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Long shank carbide 3/4" forestner bit
Defective out of the box, carbide was cracked while removing rubber coating. if it ok it would be far superior to steel bits if drilling a lot of holes.
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Top quality forstner bits
These bits are great. Since they are carbide, they're super sharp and cut very clean holes. They're certainly more expensive than standard HSS bits, but well worth it. I wish they came in a set though, as you can normally get a better deal that way.
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Carbide tipped Forster bit
Have drilled hundreds of holes and staying very sharp. Very good bit.
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