In the daily work of electricians and plumbers, one size is almost universally recognized and relied upon: 17mm. This seemingly ordinary number is actually the "golden standard" in the world of precision installation. Today, we'll explore why this particular size matters so much — through the lens of a 17mm bi-metal hole saw.
What Exactly is 17mm, and Why This Specific Size?
17mm is approximately 11/16 inch. This size has become an industry standard because it precisely matches the most common installation needs:
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Pipe Penetration: The most frequently used water pipes and gas pipes in residential and commercial buildings typically have an outer diameter of 15–16mm. A 17mm opening allows the pipe to pass through smoothly without leaving excessive gaps that compromise sealing.
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Conduit Installation: Standard electrical conduits (such as PVC or metal conduits) are perfectly matched to a 17mm opening. The clean circular hole ensures the conduit is securely and firmly installed.
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Temperature Sensors and Probes: Many industrial sensors and temperature probes have an installation diameter of exactly 16–17mm.
The logic behind this size is simple: too large and you lose the seal; too small and the pipe won't fit. 17mm hits the sweet spot — no need to enlarge the hole or fill gaps afterward.
Why Can't Electricians and Plumbers Do Without It?
1. Precision Penetration in Building Structures
Electricians need to drill through beams and studs to run conduits; plumbers need to penetrate walls and floors for water lines. If the hole size is off, even slightly, it can compromise the installation or require costly rework. A 17mm hole saw cuts cleanly in one pass, creating a smooth, finished hole that needs no additional filing or trimming before installation.
2. Standardized Design Across Brands
Nearly all major tool brands offer 17mm hole saws with universal arbor interfaces, making them compatible with a wide range of power drills. From IRWIN's Bi-Metal series to DEWALT, Bahco, and RS PRO, the 17mm size is a standard offering in nearly every brand's product line.
3. Exceptional Versatility Across Materials
What can a 17mm bi-metal hole saw cut? The answer is: almost anything.
| Material Type | Cuttable? | Key Considerations |
|---|---|---|
| Wood (including boards and timber) | ✅ | Maximum cutting depth up to 38mm |
| Mild Steel Sheet | ✅ | Low speed recommended; thickness not exceeding 3mm |
| Stainless Steel | ✅ | Cutting fluid required + slow feed rate |
| Copper Pipe, Aluminum Pipe | ✅ | Smooth cutting, teeth remain intact |
| PVC / Plastic Pipes | ✅ | Best results at higher speeds |
| Drywall / Plasterboard | ✅ | Clean cut without edge chipping |
One tool for multiple jobs — for tradespeople who carry their tools to job sites, this is real efficiency.
The Bi-Metal Construction: The Key to Performance
17mm is just the size. What truly determines whether this hole saw can do the job is the bi-metal construction.
A bi-metal hole saw is engineered with a high-speed steel (HSS) toothed edge (often cobalt-enriched) welded to a tougher alloy steel body through an electron-beam welding process. This gives the tool the best of both worlds:
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Hard teeth capable of cutting through stainless steel, cast iron, and other hard materials
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Tough body that resists cracking or deformation under impact and vibration
Combined with a variable tooth pitch design (typically 4–6 TPI) , it reduces vibration, improves chip clearance, and delivers a smoother cutting action. This is why a quality bi-metal hole saw outlasts ordinary carbon steel hole saws many times over.
All You Need Is a Power Drill
One of the biggest advantages of a 17mm hole saw is its low barrier to entry. You don't need a drill press or complex fixturing — a standard hand drill with the appropriate arbor is all that's required. As noted in RS PRO's product literature, these hole saws are specifically designed to allow electricians and plumbers to perform accurate on-site hole cutting without having to transport workpieces back to a workshop.
Recommended RPM by material:
| Material | Recommended Speed (RPM) |
|---|---|
| Wood | ~3,000 |
| Mild Steel | ~500 |
| Stainless Steel | ~250 |
| Aluminum | ~750 |
Summary
The 17mm size has earned its status as the "golden size" for electricians and plumbers because it sits at the intersection of standards, precision, and efficiency:
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Standardized Fit: Precisely matches the penetration requirements for common pipes, conduits, and sensors
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Multi-Material Capability: One hole saw cuts wood, metal, and plastic — no frequent bit changes
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On-Site Simplicity: Works with a standard hand drill for immediate use in the field
For professionals who value quality and efficiency, keeping a 17mm bi-metal hole saw in your toolbox is one of the smartest investments you can make.
Need to purchase or learn more about HYCHIKA's bi-metal hole saw kits? Visit our website or contact our support team for product details and technical assistance.
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