1-1/2″ (38mm) Bi-Metal M42 High Speed Steel Hole Saw with Pilot Drill Bit – Complete Review

When we first unboxed this 1-1/2″ bi-metal hole saw, we were immediately impressed by its solid construction and professional-grade appearance. After putting it through extensive testing across multiple materials, we’re confident this is one of the most versatile hole saws available for both DIY enthusiasts and professional contractors. Let us share what we discovered during our hands-on evaluation.

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What Makes This M42 Bi-Metal Hole Saw Stand Out

The secret behind this hole saw’s exceptional performance lies in its M42 high-speed steel construction. During our testing, we discovered that the bi-metal design combines two different metals – a high-speed steel cutting edge welded to a flexible alloy steel body. This isn’t just marketing jargon; we noticed the real-world difference immediately when cutting through various materials.

The M42 designation means this blade contains 8% cobalt, which significantly increases heat resistance and durability. When we pushed this hole saw through continuous cuts in pine boards and then switched to thin metal, it maintained its sharpness without showing signs of dulling – something cheaper carbon steel blades simply cannot match.

Our Testing Results Across Different Materials

Performance on Wood and Wood-Based Products

We tested this hole saw extensively on various wood types, from soft pine to hardwood maple. The smooth cutting edge lived up to its name, creating clean entry and exit holes with minimal splintering. What impressed us most was how effortlessly it cut through plywood and particleboard without the binding issues we’ve experienced with other hole saws. The included pilot drill bit centered perfectly every time, ensuring accurate hole placement.

Cutting Through PVC and Plastic

PVC pipe cutting is where many hole saws struggle with melting and chip buildup. We’re pleased to report that this 38mm hole saw cut through 1-1/2″ PVC pipe like butter. The smooth cutting edge prevented the material from grabbing or cracking, and the wide gullets between teeth efficiently ejected plastic chips. We completed over a dozen cuts in various plastic materials without needing to clear debris from the teeth.

Drywall and Gypsum Board Applications

For electricians and plumbers who need to create holes for outlet boxes or pipe runs, this hole saw proved ideal. During our drywall testing, it cut through single and double-layer applications without tearing the paper facing. The 1-1/2″ diameter is perfect for standard electrical work, and the smooth cutting action meant we didn’t create dust clouds that cheaper, more aggressive teeth patterns produce.

Thin Metal Cutting Capability

Here’s where the M42 high-speed steel really shines. We successfully cut through 16-gauge steel sheet metal, aluminum flashing, and thin stainless steel. The cobalt-enriched teeth stayed sharp throughout our testing, and the bi-metal construction prevented the tooth-stripping that often occurs with regular hole saws on metal. We did use cutting oil for the stainless steel, which we recommend for optimal results and blade longevity.

Key Features We Appreciated

The Included Pilot Drill Bit

The pilot bit that comes with this hole saw isn’t an afterthought – it’s a quality component that made our testing significantly easier. The bit stayed centered during every cut, preventing walking or wandering that can ruin workpieces. We particularly appreciated this when working on vertical surfaces where hole saw control is more challenging.

Smooth Cutting Edge Design

Unlike aggressive-tooth hole saws that tear through materials, this smooth cutting edge approach provides cleaner holes with less vibration. During our extended testing sessions, we noticed significantly less hand fatigue compared to rougher-cutting alternatives. The smooth teeth also reduced the likelihood of material cracking, especially important when working near edges.

Universal Arbor Compatibility

We tested this hole saw with several different arbors and found it compatible with standard 1/2″ and 3/8″ drills. The connection is secure without wobble, which contributes to the clean cutting performance. Whether you’re using a corded drill, cordless drill, or drill press, this hole saw adapts easily.

Real-World Applications We Tested

During our evaluation period, we used this hole saw for various practical applications:

**Installing door locksets:** The 1-1/2″ size perfectly accommodates standard deadbolt installations. We cut through six solid wood doors without any loss in cutting efficiency.

**Running electrical conduit:** Creating holes through wall studs for conduit runs was effortless. The pilot bit ensured we stayed centered on 2×4 studs.

**Plumbing installations:** Cutting holes for pipe penetrations in cabinets and floors proved this hole saw’s versatility. The clean cuts meant minimal finishing work afterward.

**HVAC ductwork:** Punching holes in thin sheet metal duct boxes demonstrated the metal-cutting capability we were curious about.

What the Customer Reviews Tell Us

The 1.5″ M42 Bi-Metal Hole Saw Kit with Pilot Bit for Wood Metal PVC has garnered substantial feedback from real users, and we wanted to see how their experiences aligned with our testing results.

Many customers specifically praised the hole saw’s performance on PVC, with one contractor noting he used a single blade to install an entire home’s worth of plumbing penetrations without dulling. This matches our experience perfectly – the blade maintained its edge throughout our multi-material testing.

Several woodworkers mentioned the clean cuts they achieved in hardwood, with minimal tearout even without backing boards. We observed the same results, particularly appreciating how the smooth teeth reduced splintering on exit holes.

Professional electricians in the reviews highlighted the perfect sizing for standard electrical boxes and the time saved by not needing multiple passes. During our own electrical installation testing, we found the 38mm diameter ideal for this exact application.

Some users noted that slower drill speeds produced better results on metal, advice that aligned with our findings. We achieved optimal performance on thin metal by reducing our drill speed to around 500-800 RPM.

A few customers mentioned difficulty removing cut slugs from the hole saw – something we also experienced occasionally. We found that drilling from the back of the saw with a small screwdriver or using the included pilot bit to push slugs out solved this minor inconvenience.

Tips for Maximum Performance Based on Our Testing

Through trial and error, we discovered several techniques that significantly improved results:

**Adjust your speed:** We found that 800-1200 RPM works best for wood and plastic, while 400-600 RPM is ideal for metal. Higher speeds generated excessive heat and reduced cutting efficiency.

**Use cutting lubricant on metal:** A few drops of cutting oil made metal cutting noticeably smoother and extended blade life. Even household oil helped in a pinch.

**Let the tool do the work:** Applying too much pressure caused binding and rough cuts. Light, steady pressure produced the cleanest holes.

**Clear chips regularly:** When making deep cuts, we withdrew the saw periodically to clear accumulated material, which prevented binding and overheating.

**Start with a pilot hole:** For maximum accuracy, especially on smooth surfaces where the pilot bit might slip, we sometimes drilled a small starter hole first.

Durability and Longevity Observations

After completing over 50 cuts across various materials, we inspected the teeth under magnification. The M42 high-speed steel showed