Over-specification is rarely a scam. It is a quote written from an old part number, a supplier who was never told what the steel was, and an order history that then repeats itself for a decade.
1 · Depth of cut deeper than the plate
The most common one by a distance. A 50 mm depth of cut on 20 mm plate costs more, cuts slower, and drills exactly the same hole.
The check: what is the thickest plate this cutter will actually see? Take the next depth up from that number and stop.
2 · Diameter chosen from the drawing, not the fastener
Hole sizes get carried across from a drawing revision or a previous job. If the fastener changed and the hole spec did not, you are buying a cutter you do not need and possibly holding a size nobody else uses.
The check: confirm the current fastener and clearance, not the one on the last set of drawings.
3 · Carbide where high-speed steel would do
Carbide is the right answer for stainless, hardened, abrasive or weathered steel, and for high volume. It is not the right answer for ordinary mild steel at ordinary volumes, and it costs meaningfully more.
There is a second cost people miss: high-speed steel can usually be resharpened several times and carbide cannot. If you have grinding capability, the cheaper grade may be cheaper again.
The check: what steel, and how many holes a month? If the answer is mild steel and moderate volume, ask why carbide was quoted.
4 · A machine class above the work
Bigger machines are heavier, need more power, and are harder to position on site. If everything you drill is under 30 mm, a large-capacity machine is weight you carry for capability you do not use.
The check: what is the largest hole you have drilled in the last year – not the largest you can imagine drilling?
5 · Sets instead of the sizes you actually use
Sets look economical. Most shops use three or four sizes constantly and the remainder sit in the box until the markings rub off.
The check: pull a year of issues from the store and rank the sizes. If four sizes cover most of it, buy those deep and buy the rest as they arise.
What good advice sounds like
It asks about the job before it names a product. A supplier who asks your plate thickness, your steel and your machine before quoting is not being slow – they are the one who can tell you when the cheaper option is correct.
The opposite is a quote that arrives fast, matches your last order exactly, and asks you nothing.
The thirty-minute exercise worth doing
Take your last twelve months of cutter purchases. Put three columns next to each line: what plate thickness it was for, what steel, and how many were used. Anywhere the specification is two steps above the work, you have found recurring money.
Send us a line off your last order
Tell us what you bought and what you were drilling with it, and we will tell you honestly whether it was the right specification. Sometimes the answer is yes.
Email info@neweratools.com or call +65 6241 0908.