Hole saws and reciprocating saw blades cover a huge share of jobsite cutting, from plumbing pass-throughs to demolition work. A hole saw bores a clean circle for pipe, conduit, or door hardware, and a reciprocating saw blade powers through framing, metal, and nail-embedded lumber. The two accessories are often sold together in storage bundles with an organizer, which is convenient because both families are easy to lose and hard to identify once the packaging is gone. Keeping blades sorted and tracking your tools and equipment pays for itself the first time a crew avoids buying duplicates. This article covers hole saw sizing, blade TPI selection, and storage that keeps both cutting families in service.
Hole Saw Anatomy and Sizing
A hole saw is a steel cylinder with cutting teeth on the rim, driven by a central arbor that holds a pilot drill bit. The pilot bit centers the cut and pulls the saw through the work, while the cup-shaped body removes a disc of material. Saw diameters are measured across the cutting teeth, and the hole that results matches the nominal size closely enough for pipe and conduit clearance.
Sizing starts with the fitting that passes through the hole. Pipe needs clearance for the outer diameter plus room for insulation or movement, so the hole is usually 1/4 to 1/2 inch larger than the pipe. Conduit and electrical boxes follow the same rule, and door hardware requires a precise match to the latch and lock bores. A common kit carries five diameters from 1-1/2 to 2-5/8 inches, which covers most residential plumbing and electrical work. When the goal is a straight, long cut rather than a circle, a circular saw delivers power and precision for the jobsite, but circular openings belong to the hole saw.
The parts of a hole saw kit
- Saw cups in multiple diameters
- A 7/16 inch arbor that drives the cups
- Pilot drill bits that center and start each cut
- A foam liner or bins for storage
How deep can a hole saw cut?
The cutting depth is limited by the cup height, typically 1-1/2 to 2 inches. For thicker stock, drill from both sides or switch to a saw with deeper cups. Deeper cups cut slower but bore through studs and joists in one pass.
Hole saw teeth cut with a scraping action rather than a slicing one, which is why the saw runs best at moderate drill speeds. Too fast and the teeth overheat and glaze; too slow and the saw chatters. A steady, firm feed keeps the teeth engaged, and a saw that starts to smoke is a sign to back off, clear the chips, and let the edge cool.
| Hole saw diameter | Common jobsite use |
|---|---|
| 1-1/2 in | 1/2 in conduit and small supply lines |
| 2 in | 3/4 in pipe and electrical boxes |
| 2-1/4 in | 1 in conduit and door hardware |
| 2-1/2 in | 1-1/4 in pipe and drain lines |
| 2-5/8 in | 1-1/2 in pipe and large conduit |
Matching Hole Saw Diameters to Common Jobsite Tasks
Plumbing pass-throughs use the largest holes. A 1-1/2 inch drain or waste line needs a 2-1/2 inch hole to clear the hub and allow adjustment, while supply lines at 3/4 inch pass through a 2 inch hole with room for the escutcheon. Electrical work is tighter; 1/2 inch conduit clears a 1-1/2 inch hole, and 1 inch conduit needs 2-1/4 inches. Door hardware sits at the precision end, where the 2-1/8 inch latch bore is a standard that most kits come close to.
Material changes the saw choice more than diameter does. Wood and drywall cut fast with a standard bi-metal saw. Fiber cement, tile, and masonry dull steel teeth quickly and need a carbide-tipped saw; a Big Hawg carbide hole saw review shows how a carbide edge keeps cutting through materials that destroy standard teeth. Always use the correct pilot bit and keep the saw perpendicular to the surface to avoid a wandering or oval hole.
Clearance rules for pipe and conduit
- Measure the fitting outer diameter, not the nominal size
- Add 1/4 to 1/2 inch for clearance and movement
- Oversize the hole for insulated lines
- Keep electrical holes tight to the box requirements
Speed and feed
- Run the drill at moderate speed and let the saw feed at its own pace.
- Forcing the saw overheats the teeth and stalls the drill.
- Back the saw out periodically to clear chips, especially in deep cuts.
- Never start a hole saw without a pilot bit seated in a center punch mark.
Reciprocating Saw Blades: TPI and Tooth Design
Reciprocating saw performance lives in the blade. The teeth per inch (TPI) number is the fastest way to match a blade to a material. Low TPI blades, around 5, have aggressive teeth with deep gullets that chew through wood and demolition debris fast. Mid-range blades near 14 TPI balance speed and finish for general metal work. High TPI blades at 18 and up cut thin metal, tubing, and sheet goods with a smooth edge and less vibration.
Tooth geometry refines the choice further. Blades marked for wood with nails combine a coarse tooth pattern with a tough body that survives embedded fasteners. Metal-cutting blades use finer teeth and a harder edge that resists the heat of friction cutting. A typical kit carries four blades of each style, which gives a crew a full day of demolition without a trip to the truck. The same selection logic applies to other saws; a top-handle jigsaw uses finer blades for tight curves in paneling and trim.
| Blade style | TPI | Best for |
|---|---|---|
| Metal cutting | 18 | Thin metal, tubing, sheet goods |
| Metal cutting | 14 | General metal, rod, and pipe |
| Wood with nails | 5 | Framing, demolition, embedded fasteners |
Blade construction matters as much as tooth count. A thick body resists bending in deep cuts, and a shorter blade gives more control in tight spaces. The tooth set, the amount each tooth leans sideways, decides how wide the kerf is and how easily the blade clears sawdust. For the same TPI, a blade with a wider set cuts faster but rougher, which is why demolition blades feel different from finish blades.
Reading a blade label
The model number and markings tell you the tooth count and intended material. A 6 inch blade with 18 TPI suits tight spaces and metal studs, while a longer 9 or 12 inch blade reaches through deep framing. Keep a labeled divider or the original packaging so blades do not end up mixed.
When to change blades
A blade that stops cutting, burns the wood, or takes visibly longer per cut is dull. Demolition blades dull faster than they break, and a dull blade is more dangerous than a broken one because it requires extra force. Swap blades at the first sign of slowdown, and carry spares for the materials you cut most.
Arbors, Pilot Bits, and Keeping Accessories Organized
An arbor connects the hole saw cup to the drill chuck, and its quality shows in runout. A straight 7/16 inch arbor spins true, so the saw cuts round and the pilot bit stays centered. Pilot bits wear and break, so kits that include two spares extend the life of the whole set. Match the arbor size to the drill you use; most job drills take a 7/16 inch arbor directly.
The best accessory investment is storage that keeps cutting edges apart. Blades that rattle together in a drawer dull each other, and hole saw cups lose their edge when they knock against metal. A compact organizer with a foam liner holds saw cups upright and blades in labeled slots, and the same box carries to the job. Organization pays off across the whole cutting kit; when every saw, blade, and cordless chainsaw has a home, crews stop buying duplicates and start finishing faster.
Organizer options
- Compact organizer with a foam liner for a bundled kit
- Deep bins for loose hole saw cups
- Blade cases with labeled slots by TPI
- Jobbox drawers with dividers for bulk stock
Extending accessory life
Dry blades before storage, because moisture starts rust on the cutting edge. Apply a thin rust inhibitor to steel blades, and replace bent arbors immediately; a bent arbor makes every cut wobble. Store hole saws with the teeth protected, never stacked loose in a bucket. The same organizing discipline works at home, where a DIY boot stand built from stair balusters keeps mud and gear off the floor and tools easy to find.
A few minutes of cleanup at the end of a job keeps the kit ready for the next one. Knock the sawdust out of the organizer, wipe down the blades, and check the pilot bits for chips. Tools that go away clean come out ready to cut, and a crew that protects its consumables spends less of the budget on replacements.
Cold weather adds another layer to jobsite productivity. Warm, dry hands grip tools better and cut more accurately, which is why heated workwear for construction pros earns a spot in winter kits. Between the right hole saw diameter, the right blade TPI, and storage that protects both, a modest accessory investment keeps cutting work moving through the coldest months.