What Size Hole Saw for 1-1/2" PVC Pipe? A Hillman Fastener Buying Guide

I've been reviewing hardware shipments for over four years now—roughly 200 SKUs a year, maybe 180 if I'm remembering last year correctly. As the quality/compliance manager at a hardware distributor, I check every product before it reaches customers. You start seeing patterns: what people buy, what they return, what they should have bought instead.

The question I hear most often is some version of: "Which Hillman product should I use?" It sounds like it should have a single answer. It doesn't. What works for a repair tech rebuilding an assembly won't be right for a homeowner fixing a drawer slide, and neither applies to a plumber drilling holes for a drain line. So let me break it down by scenario.

What Most Buyers Miss

Most buyers focus on material and price and completely miss drive type and thread geometry. I've watched experienced contractors grab a box of Phillips flat-heads for a job that called for socket cap screws, then blame the screw when the driver skipped. What I mean is: the fastener's shape has to match the installation, not just the label on the front of the bin.

The question everyone asks is, "Is this the right price?" The question they should ask is, "Is this the right spec for my application?" A fastener that strips out or fails costs more in labor and rework than the $3 difference in box price ever saves.

Scenario 1: Metal-to-Metal Assembly or Precision Repair

If you're joining metal to metal—a bracket to a frame, a motor mount, an equipment panel—machine screws are the correct fastener class. Machine screws are threaded along the full shaft and are designed for tapped holes or nut-and-washer assemblies. A wood screw won't hold up here because its thread geometry is built for soft material, not a tapped thread.

Hillman Phillips-drive machine screws are a dependable baseline. In my workflow, I verify three things on every incoming batch:

• Thread pitch consistency across the box—it should match the marking and the spec sheet
• Head markings that align with the label and the purchase order
• Drive seating—a Phillips bit should seat firmly with no wobble

Phillips remains the standard for general assembly work, and it's fine for most jobs. There's a caveat: Phillips drive heads cam out under high torque. If you're driving at high torque all day, Torx is mechanically better. I'll get to that in Scenario 3.

If your project involves a spring—a latch return, a valve assembly, a drawer slide—Hillman compression springs come in a wide range of sizes. The spec that matters is spring rate (pounds per inch of compression), not just free length. A longer spring is not necessarily a stronger spring; wire diameter and active coil count determine the rate.

That's a lesson I learned the hard way. A few years back we received a production batch with springs that looked identical to the spec, but the wire gauge was slightly different. They worked for about 300 cycles before some failed in the field. That quality issue cost our customer a $22,000 redo—and that's not counting the schedule delay. Now every contract I touch includes spring-rate verification on the incoming inspection checklist.

Scenario 2: Everyday Household Work

For light jobs around the house—tightening cabinet hinges, changing a switch plate, assembling flat-pack furniture—you don't need a full professional toolkit. The Hillman vinyl grip Phillips screwdriver 65-901 is a solid, unglamorous tool that does its job well.

Why recommend a manual screwdriver over a power driver? Control and feel. Most stripped screw heads I've dealt with were caused by a driver size mismatch or too much torque. A #1 Phillips bit in a #2 Phillips screw head will cam out and chew the cross. With a manual screwdriver, you feel the resistance and naturally stop when the screw seats. A power driver at high speed gives you less feedback.

I'll be straight about its limits: if you're driving more than twenty or thirty screws in one sitting, or working with hardened steel screws, get a power driver. The 65-901 is not a universal tool. (Not that people won't try, but that's on them.)

One overconfidence story: I skipped checking the bit size before tightening a faceplate because "it's basically the same #2 bit I always use." It was actually a #1 sitting on my bench, and I mangled the screw. What should have been a two-minute fix became a fifteen-minute ordeal. Small thing, but it stays with you.

Scenario 3: Production Work or High-Volume Fastening

The game changes when you're driving fasteners all day. Phillips cam-out stops being a nuisance and starts being a labor cost. Every slipped bit is time spent on extraction, and that eats margins.

Torx was designed specifically to resist cam-out: the six-point star pattern engages the full face of the recess, so the bit doesn't ride out under torque. For production and contractor work, I recommend a quality 36-piece drive Torx bit socket set. It keeps the right size on hand instead of forcing you to improvise.

What I look for in a set:

• Hardened steel bits—soft bits round off fast, especially under high torque
• Deep and standard sockets in the same case, so you're not switching between sets
• Clear size markings on each socket. That's surprisingly uncommon in cheaper kits

The spreadsheet side of my brain says buy the budget set and treat it as disposable. My gut said spend slightly more for a set with proper steel and markings. The set has outlasted two disposable kits that I tested alongside it. Cheap bits don't save money when a rounded-off bit takes an extra five minutes per fastener.

Scenario 4: What Size Hole Saw for 1-1/2" PVC Pipe?

This might be the single most common question I get from electricians, plumbers, and homeowners: what size hole saw do you need for 1-1/2" PVC pipe? The short answer: use a 2" hole saw.

The reason the nominal size doesn't match is simple: a 1-1/2" PVC pipe has an outer diameter of about 1.9 inches, not 1.5 inches. A 2" hole saw gives you roughly a tenth of an inch of clearance around the pipe—enough to slide it through without binding while keeping the opening snug.

There are two big caveats:

If a fitting has to pass through the hole—any coupling, elbow, or stop—the hole needs to be bigger. Fittings have a considerably larger OD than the pipe itself. For a fitting on 1-1/2" PVC, a 2-1/2" hole saw is the practical choice. Measure the actual fitting before you drill; don't trust the label.

If you're drilling through joists, building codes limit hole sizes. A common rule of thumb—if I remember correctly—is to keep the hole diameter to one-third or less of the joist depth, and keep it at least 2" from the edges. Confirm with your local code, because that can be stricter.

For clean, repeated holes, a carbide-tipped hole saw works well. If you're drilling at an angle, a spade bit gives you more control. But for a standard round pass-through, 2" is the size you want.

How to Tell Which Scenario You're In

Still unsure? Run through these questions:

1. What materials are you joining? Metal-to-metal → machine screws. Metal-to-wood → wood screws. Drywall → anchors.
2. How much work are you doing? Daily professional volume → Torx bit set. Occasional household → manual screwdriver. A big weekend project → power driver with a quality Phillips bit.
3. Are you drilling for pipe? Measure the outer diameter of the pipe and any fittings, add clearance, then pick the hole saw. Don't guess from the nominal size.

Final Word: Claims, Trust, and the Bottom Line

Per FTC advertising guidance (ftc.gov), manufacturers have to substantiate their claims. That matters when you see "rust-resistant" or "heavy duty" on packaging, because not every label survives scrutiny. In our audits, we've seen a wide spread in coating quality under the "rust-resistant" umbrella. Hillman publishes specific material specs, which is why I trust them for baseline sourcing. But for mission-critical applications, verify the spec yourself.

Here's the bottom line I'd give any contractor in the aisle:

• Metal assembly work: Hillman Phillips-drive machine screws; compression springs matched by spring rate, not just length
• Household tasks: Hillman vinyl grip Phillips screwdriver 65-901, used with the correct bit size
• Production or repeated driving: 36-piece drive Torx bit socket set with hardened steel bits
• Drilling for 1-1/2" PVC pipe: 2" hole saw for pipe alone; larger if any fittings pass through

None of these is universal. If your job doesn't match a scenario above, ask someone who's done it before. A quick call beats a wrong part every time.