5/64 to 7/16 in bits
RUITOOL Drill Bit Stop Collar Set, 2 Pieces
Bits 5/64 to 7/16 in · Aluminum, nylon ring
$19.99
Saw Guides & Drill Jigs · M2 to M10
RUITOOL Desktop Tapping Arm, 90 Degree Tap Guide
$79.99
Tapping arm
An articulated arm that holds a tap square to the work and is driven by your hand drill. It is made for tapping the ends of aluminum extrusion.
- Chuck
- Three-jaw, 1/16 to 3/8 in
- Taps
- M2 to M10 and #2 to 3/8 in
- Mount
- C-clamp to 1.73 in, or screwed to the bench
- Drive
- Your hand drill
Fits
- 2020, 2040, 3030, 4040 and 8020-style aluminum profiles
- Vertical and horizontal tapping
Not for
- Production tapping in steel
Checkout, payment and delivery happen with our retail partner. Price from our update of 1 October 2026. How we update prices
What it does
The Desktop Tapping Arm, in three points
Square threads
The arm keeps the tap at 90 degrees, which cuts the side load that snaps small taps.
Chuck for M2 to M10
A three-jaw chuck of 1/16 to 3/8 in takes metric and SAE taps.
Clamp or screw down
A C-clamp opens to 1.73 in for a quick setup. The base can also be screwed to the bench.
Specifications
- Chuck
- Three-jaw, 1/16 to 3/8 in
- Taps
- M2 to M10 and #2 to 3/8 in
- Mount
- C-clamp to 1.73 in, or screwed to the bench
- Drive
- Your hand drill
- Weight
- 0.8 kg
At the bench
Building a frame from 2020 or 4040 extrusion means tapping dozens of end holes. By hand, each one risks a crooked start. With this arm, the tap goes in straight every time. Clamp it to the bench, chuck the tap, connect your drill and run at low speed with cutting fluid. It taps down into a part on the table or sideways from the bench edge.
Check before you buy
- Your taps are between M2 and M10, or #2 and 3/8 in.
- You have a hand drill with a low speed.
- Your bench edge is 1.73 in thick or less, or you can screw the base down.
Limits
Pick another one if
It is a jig for aluminum profiles and light work. It is not a tapping machine, and it has no torque clutch. Hold the drill with both hands and let the tap cut. It is also the odd one out in a woodworking catalog, bought mostly by people building printer and CNC frames.
Same bench
RUITOOL Saw Guides & Drill Jigs
5 tools, from $19.99. Set them side by side in one table.
All 5 RUITOOL Saw Guides & Drill JigsFrom the same bench
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Tools that share a bench or a job with the Desktop Tapping Arm.
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From buyers
What buyers say about the Desktop Tapping Arm
4.4 out of 5 from 17 ratings. Reviews word for word, with the critical ones left in.
Base and arm are very stout, spindle has small wobble
Arm is very robust, I actually purchased it for my thead inserts for my 3D prints. The only reason why I didn't give it 5 stars is there's a little wobble in the drill spindle that could cause issues for those who want to tap 4-40 or M2 bolts. For my application I'm removing this spindle and making something to hold my soldering iron.
It works!
It is a good rig once you understand how to use it properly. If you have the tooling you can also extend the reach by making your own arms.
Questions
Desktop Tapping Arm: answers
Which profiles is it for?
2020, 2040, 3030, 4040 and 8020-style aluminum extrusion.
What drives it?
A standard hand drill. Run it at low speed and use tapping fluid.
Can it tap horizontally?
Yes. It supports vertical tapping on the tabletop and horizontal tapping from the bench side.
The RUITOOL range
RUITOOL Saw Guides & Drill Jigs in one place
Squares and fences that keep a power saw on line, and jigs that keep a drill or a tap at the right depth and angle. 5 tools, from $19.99.