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SKU: 61-512

Infinity Tools 1/2" Shank Precision Twist Slot Cutting Router Bit

12 Reviews
$139.90

Groove Width

The Infinity Tools Precision Twist slot-cutting router bit is a new spin on a traditional slot cutter. What makes these bits so different is that they’re infinitely adjustable from 1/8″ to 1/4″ (Item 61-512) with the twist of the adjusting nut on the top of the bit. With the ability to fine-tune your cut in .004” increments, you’ll always have the perfect size slot cutter for the job and never have to mess with those pesky, easy-to-loose shims on traditional, stacked slot-cutting router bits.

These router bits include a bearing that limits the depth of cut to 1/2". With a 1/2" shank and an overall diameter of 2" we recommend a maximum speed of 16,000 rpm using a variable-speed router or router speed controller. While these bits can be used in a hand-held router they're ideally suited for use in a router table or CNC machine. Each of these bits feature four carbide cutting tips of the same high quality and long life you would expect from Infinity Cutting Tools.

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Kevin K. Verified Customer   
08-09-22
A bit worth the price

I am extremely happy with my purchase of this specialty bit. An innovative idea that not only gets the job done well, but saves time and money. And these days that means a lot. I love this bit. Like when cutting dados using an adjustable dado blade set, this bit allows you flexibility of sneaking up on the final width of the cut. The quality of this bit is in the “industrial” category, well built and capable!

Christopher S. Verified Customer   
07-04-22

Great slot cutters

Dr D. Verified Customer   
11-21-18

Why did I wait so long? One bit replaces many.

Questions & Answers
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Popular Questions

5 years ago
Can the bearing be changed on these bits, e.g., to a larger size to allow a shallower depth of cut? See more »
5 years ago
No, but you could control your depth of cut with your router table fence.
7 years ago
These look to good to be true, but I see on the 1/2" model there seems to be a problem with the adjustment knurled xxxx and the top cutter. It looks like the top cutter is not going up fast enough and the knurled xxxx is very sloppy. I would not buy that one if this is true. See more »
7 years ago
The adjustment xxxx is able to float vertically while adjusting the cutting height of the bit. Once the locking nut is tightened locking the setting the adjustment xxxx is also locked. This is completely normal to the design of both Precision Twist Bits.
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Precision Twist Slot Cutting Router Bit System

The Infinity Tools Precision Twist slot-cutting router bits are a new spin on a traditional slot cutter. What makes these bits so different is that they’re infinitely adjustable from 1/8″ to 1/4″ (Item 61-512) or from 1/4″ to 1/2″ (Item 61-513) with the twist of the adjusting nut on the top of the bit. With the ability to fine-tune your cut in .004” increments, you’ll always have the perfect size slot cutter for the job and never have to mess with those pesky, easy-to-loose shims on traditional, stacked slot-cutting router bits.

With a pair of Precision Twist Slot-Cutting Router Bits, you can create slots in any width from 1/8
With a pair of Precision Twist Slot-Cutting Router Bits, you can create slots in any width from 1/8" through 1/2" in .004" increments.

The Infinity Tools Precision Twist Slot-Cutting Router Bits are a new spin on a traditional slot cutter. These are different from your usual slot cutting router bits because they allow for infinite adjustability from 1/8" to 1/4" (Item 61-512) or from 1/4" to 1/2" (Item 61-513) cutter kerfs with the twist of the adjusting nut on the top of the bit. With these router bits, you'll always have the perfect size slot cutter for the job and will never need to mess with those tiny shims on traditional stacked slot-cutting router bits.

Use the included wrench to loosen the lock nut to adjust the width of the slot cutter.
Use the included wrench to loosen the lock nut to adjust the width of the slot cutter.

Adjusting the Precision Twist slot cutters is easy. First, loosen the top nut on the bit with the included wrench. Second, turn the knurled knob on the top of the bit to adjust the spacing between the pair of cutters. The bits are etched with one-eighth increment hash marks around their circumference to help dial in the desired cutting width.

Etched markings around the bit provide an aid for fine-tuning the cutter width.
Etched markings around the bit provide an aid for fine-tuning the cutter width.

Each hash mark represents 0.004" of adjustment. One full revolution of the knob adjusts the overall cutter width 1/64". Tighten the lock nut back down and you are ready to put the bit to use.

Quality materials and computerized manufacturing methods contribute to the precision and long life.
Quality materials and computerized manufacturing methods contribute to the precision and long life.

There are no clicks or detents in the adjustment mechanism. This enables infinite adjustability between the minimum and maximum cutting widths of the router bits. This is handy for any other situations that come up in custom woodworking, such as creating an absolutely perfect-fitting groove for undersized plywood.

Each of these bits includes a bearing that limits the depth of cut to 1/2". With a 1/2" shank and an overall diameter of 2", we recommend a maximum speed of 16,000 rpm with your variable-speed router or router speed controller. While these bits can be used in a hand-held router, they're ideally suited for use in a router table or CNC machine. Each of these bits features four carbide cutting tips of the same high quality and long life you would expect from Infinity Cutting Tools.

The Infinity Difference