Bosch Expert SelfCut Speed 22mm spade bit with self-feeding tip and wave-shaped flute design. Drills clean, fast holes in wood with a 1/4 inch hex shank. Suitable for drill drivers and impact drivers with hex chucks.
The Bosch Expert SelfCut Speed Spade Bit in 22mm is one of those bits that reminds you what a difference good tooling makes. If you’ve ever forced a cheap flat bit through a joist while it clogs, wanders and scorches the timber, you’ll know immediately what this one is doing differently. The bosch 22mm spade bit uses Bosch’s own Tip Technology, a self-feeding screw thread at the point that pulls the bit into the material rather than relying on you to push. Less effort, better control, faster cutting. Simple as that.
The 22mm diameter is a size that comes up constantly on site. Cable runs, conduit, service penetrations through stud work and joists — 22mm is right in the sweet spot for 20mm conduit and a good range of cable bundles. At 152mm total length it reaches comfortably through a standard stud or floor joist without the bit bottoming out before you’re through.
What Makes the Bosch Expert SelfCut Speed Bit Worth Using
The wave-shaped spade profile is the other bit of clever design here. Traditional flat bits tend to pack chips into the flute, which slows the cut and builds heat. The wave geometry on this bit clears waste material upward and out of the hole far more efficiently. In practice that means you can run through a series of holes at pace without constantly backing out to clear the bit. For an electrician first-fixing a house, or a plumber running pipe through multiple joists, that kind of throughput adds up quickly.
The 1/4 inch hex shank fits both standard three-jaw drill chucks and hex chuck drill drivers or impact drivers directly. No adaptor needed in most cases. Worth noting that while these bits will seat in an impact driver, spade bits generally perform better in a standard drill or drill driver where you have more control over speed and the bit isn’t subjected to rotational hammering. More on that in the trade tip below.
Part of the Bosch Expert Range
This bit sits in Bosch’s Expert line rather than the entry-level Standard range. The material quality and the precision of the tip geometry reflect that. It’s not the cheapest 22mm spade bit you’ll find, but for anyone drilling repeatedly rather than occasionally, the speed and cleanliness of the cut justifies the difference. If you’re buying for a one-off job, fair enough. If you’re on site regularly, it’s the obvious choice.
Pro Tip: Run spade bits at a higher speed with moderate feed pressure rather than low speed with heavy force, the self-feeding tip does the work and forcing it will just burn the cutting edge.
This bit is used wherever a clean 22mm hole is needed through timber. First fix electrical work is the obvious one, drilling through joists and studwork for cable routes, but it's equally useful for plumbing passes, speaker cable runs, and general carpentry where a flat bit is the right tool rather than an auger or hole saw. Works well in softwood, hardwood, MDF, and sheet timber. Plumbers, electricians, shop fitters and carpenters will all find steady use for a 22mm spade bit on a working day.
Best For
Drilling cable and conduit holes through joists and studwork
First fix electrical and plumbing work
Carpentry and joinery requiring clean 22mm bores
Sheet material and solid timber
Compatible With
Standard 3-jaw drill chucks
1/4 inch hex chuck drill drivers
Impact drivers (drill mode preferred)
Key Specifications
Diameter: 22mm
Total length: 152mm
Shank: 1/4 inch hex
Self-feeding screw tip
Wave-shaped flute for chip clearance
Bosch Expert range
Not suitable for: Not suitable for drilling into masonry, metal, or plastic. The self-feeding tip is designed specifically for timber, so use in non-wood materials will damage the cutting edge quickly.
Fit the 1/4 inch hex shank into your drill driver or drill chuck and ensure it's seated securely. Set your drill to a medium-to-high speed. Position the self-feeding tip on your marked centre point and apply steady, light pressure. The screw tip draws the bit in without you needing to lean on the drill.
Back the bit out briefly if you're drilling through thick timber and feel the flutes loading up with chips. On a production run of holes it's worth keeping the bit moving at consistent speed rather than stopping and starting, as this keeps the cut clean and reduces the chance of the tip wandering on entry.
Mark the centre of each hole clearly before starting, a self-feeding tip will commit to its entry point quickly
Fit the 1/4 inch hex shank securely into your drill or drill driver chuck
Set drill speed to medium-high with no hammer action engaged
Position the screw tip on your centre mark and begin drilling with light, steady feed pressure
Let the self-feeding tip pull the bit through rather than forcing the drill forward
Back the bit out occasionally on deep cuts to clear chips from the flutes
Ease off feed pressure as the tip breaks through the far face to avoid blowout on the exit side
Can this spade bit be used in an impact driver?
The 1/4 inch hex shank does fit directly into an impact driver, and it will work. That said, spade bits generally perform better in a standard drill or drill driver where you have variable speed control and no rotational impact. Impact mode can stress the bit and produce a rougher cut. If your only option is an impact driver, set it to drill mode if available.
What is the 22mm size suitable for in practice?
A 22mm hole is the right size for 20mm conduit with a bit of clearance, most standard cable bundles in domestic first fix, and various pipe grommets and bushings. It's one of the most-used sizes in electrical and plumbing rough-in work, which is why it's worth having a quality bit for it rather than a budget one that blunts after a dozen holes.
The Bosch Expert SelfCut Speed Spade Bit is manufactured from high-grade steel with a precision-ground cutting edge and a machined self-feeding screw tip. The wave-profile flute geometry is designed to improve chip evacuation compared to flat-profile spade bits. The 1/4 inch hex shank is machined to fit both standard and quick-release chuck systems. This bit is part of Bosch's Expert range, positioned above the Standard tier for demanding or repeated-use applications.
Diameter
22mm
Total Length
152mm
Shank Type
1/4 inch hex
Shank Diameter
6.35mm
Tip Type
Self-feeding screw thread
Range
Bosch Expert
Quantity
1
Material Suitability
Wood and wood-based sheet materials
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