How to Tell Carbide from HSS
Weight, spark, and marking tests that identify which material you are holding.
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WHAT IS NOT CARBIDE: DON'T GET BURNED
Not everything gray and heavy is carbide. Gold-coated HSS drills, ceramic inserts, chrome-plated steel, tungsten heavy alloy, and even real carbide wedding rings all get mistaken for carbide scrap — and every one of them is worth far less than the real thing. Here is how I tell them apart at the counter, and the quick test that exposes each imposter.
HSS Look-AlikesCeramic InsertsHeavy Alloy30-Second Tests
THE NUMBER-ONE IMPOSTER
Gold-coated HSS: the classic fake-out
It looks the part. It is not the part. Here is the test that ends the argument.
If you bought a set of gold-colored drill bits at the hardware store, you own the number-one carbide imposter. That gold color is a titanium-nitride coating on high-speed steel — TiN-coated HSS. It looks professional and expensive. But underneath the coating it is steel, and steel is worth steel money, not carbide money.
The giveaway is weight. HSS runs about 8 grams per cubic centimeter. Solid carbide runs about 14 to 15 — nearly double. Pick up a real carbide end mill in one hand and a gold HSS drill in the other and your hand knows instantly. If you want proof beyond the heft, run the spark test: touch it to a grinding wheel and HSS throws long, bright yellow-white sparks that fork and spray. Carbide throws short, dull reddish-orange sparks that die fast.
The coating trap: the gold TiN coating on HSS comes from the same family of coatings you will see on real carbide tooling. Color tells you nothing. Weight tells you everything.
ZERO TUNGSTEN INSIDE
Ceramic inserts: the perfect look-alike
Same shape, same little box, none of the tungsten.
Modern ceramic inserts — silicon nitride, alumina, the black and green ones — are shaped exactly like carbide inserts and even ship in the same style of packaging. They contain zero tungsten. They are ceramic, full stop, and there is nothing in them for a carbide buyer to recover.
The test is the same one as always: heft. Ceramic runs about 3 to 4 grams per cubic centimeter, roughly a quarter the density of carbide. A ceramic insert feels wrong the moment you pick it up — too light for its size. They are usually matte black, dark green, or white, and they will not throw carbide's dull red spark on the wheel.
What I pay for them: nothing as carbide. I do not buy ceramic inserts, and no carbide processor does either.
CLOSE COUSIN, DIFFERENT PRODUCT
Tungsten heavy alloy: real tungsten, not carbide
This one fools smart people. Handle it accordingly.
Tungsten heavy alloy is 90-plus percent tungsten metal with a nickel-iron binder — dense, usually slightly magnetic, and genuinely valuable. But it is not carbide. There is no carbon in it, and processors treat it as a completely different product with completely different pricing.
You cannot reliably tell heavy alloy from carbide by hand. The densities overlap and both feel like a brick. This is the one case where I will tell you straight: send photos, and for real money we go to assay. Mixed into a carbide lot, heavy alloy contaminates the grade — keep it in its own bucket.
What I pay for it: a custom quote from photos or assay. It is worth real money, just not carbide money.
REAL CARBIDE, WRONG MARKET
Carbide wedding rings: genuine, and worthless as scrap
Yes, it is real carbide. No, it is not scrap.
Your tungsten carbide wedding ring is the real material — usually bound with nickel instead of cobalt so it does not irritate skin. But jewelry carbide has no buyback market at carbide prices, and no refiner is set up to take in one ring at a time.
Here is the proof of how real it is: jewelers cannot resize them. A gold ring gets cut and rejoined; a carbide ring gets cracked off with a tool in an emergency room. That hardness is genuine. The scrap market for it is not.
What I pay for them: I do not buy rings. Keep it on your finger.
HALF CARBIDE, HALF STEEL
Brazed tips on steel shanks: worth less, still worth something
The tip is the value. The shank is the discount.
Brazed tooling — a carbide tip silver-soldered onto a steel body — is genuine carbide with a steel anchor attached. A magnet tells the story in one second: it grabs the steel body and ignores the tip.
What I pay for it: lower than solid carbide, and every lot gets a custom quote. Do not break the tips off trying to "clean" them — send them as they are and I will grade them honestly.
SHINY AND WORTHLESS
Chrome-plated steel: the magnet test ends it
Pretty, heavy-looking, and worth steel money.
Chrome-plated steel is shiny, silvery, and completely magnetic. It fails every test in seconds: the magnet grabs it hard, it weighs like steel because it is steel, and a file bites right into it where a file would skate across carbide.
What I pay for it: steel price. Which is to say, do not ship it to a carbide buyer.
| What you are holding | The 30-second test | What it is worth to me |
|---|---|---|
| Gold-colored drills or bits | Weigh it: HSS feels like ordinary steel; carbide feels shockingly heavy. Spark test confirms it. | Steel money — not carbide pricing |
| Ceramic inserts (black, green, white) | Heft it: ceramic feels far too light, about a quarter the density of carbide. | Nothing as carbide — I do not buy ceramic |
| Tungsten heavy alloy | Looks and weighs like carbide; only photos plus assay tell for sure. Keep it separate. | Real money, different product — custom quote from photos or assay |
| Carbide wedding ring | It is real carbide with a nickel binder — and it is jewelry. | Sentimental value, not scrap — I do not buy rings |
| Brazed tip on a steel shank | Magnet grabs the steel body, ignores the tip. | Lower than solid carbide — custom quote |
| Chrome-plated steel | Magnet grabs it hard; a file bites into it. | Steel price |
COMMON QUESTIONS
Asked at the counter every week.
I have gold-colored drills. Are they carbide?
The gold color is usually a titanium-nitride coating, and it goes on both HSS and carbide, so color tells you nothing. Weigh one: if it feels like ordinary steel, it is HSS. If it feels shockingly heavy for its size, it may be carbide. When in doubt, text me a photo.
Are carbide wedding rings worth anything as scrap?
No. They are real tungsten carbide, but there is no scrap market for jewelry — no refiner buys single rings. Keep it, wear it, hand it down.
Is tungsten heavy alloy the same as carbide?
No. Heavy alloy is tungsten metal with a nickel-iron binder; carbide is tungsten carbide with a cobalt binder. Both are dense and valuable, but they are different products with different prices. I quote heavy alloy separately from photos or assay.
Do you buy ceramic inserts?
No. Ceramic inserts contain no tungsten, so there is no value for a carbide buyer to recover. If you are unsure whether your inserts are ceramic or carbide, the weight test settles it — ceramic feels far too light.
My magnet sticks to it. Is it still carbide?
It can be. Some carbide grades are magnetic because of the cobalt binder, and brazed tooling has a steel body the magnet grabs. The magnet test rules steel out; it does not rule carbide in. Weight and spark tests finish the job.
I have worn carbide tools to sell. Do you buy small lots?
Yes — small lots are welcome, and every bucket counts. A handful of worn end mills is worth the call just as much as a full drum. Call or text 312-880-8174.
THE HONEST CLOSE
Know What You Are Holding. Then Call Me.
Here is my end, stated plainly. I pay a firm $18–$20 a pound for clean, sorted tungsten-carbide inserts, end mills, and drills. Brazed tooling runs lower and gets a custom quote. Sludge and tungsten heavy alloy get custom quotes from photos or assay. I pay within 24–48 hours. If anything on this page left you unsure about your bucket, that is exactly what the photo is for — call or text 312-880-8174 and I will tell you what you have got.