Tungsten weight per cubic inch and what it means for carbide parts
Weight-per-cubic-inch conversions are useful only when the material basis is clear. Pure tungsten and cemented tungsten carbide are related, but they are not the same material and should not be used interchangeably for engineering or RFQ estimates.
Carbide density changes by grade because binder content and composition change the final material. When a part weight affects cost, handling, freight, or production planning, use a grade-specific carbide density rather than a generic tungsten number.
Quick answer
Pure tungsten is often listed around 0.70 lb per cubic inch. Cemented tungsten carbide is usually lower than pure tungsten and varies by grade. The safest estimate uses the density value for the specific carbide grade being quoted.
Do not mix tungsten and tungsten carbide
Searchers often use tungsten and tungsten carbide interchangeably, but engineering estimates should not. Cemented carbide includes a binder phase and is manufactured to deliver a balance of hardness, toughness, density, and wear resistance. Those properties change by grade, so the weight calculation should match the material being used.
Why cubic-inch conversions are popular
Many prints and purchasing requests use inch dimensions, which makes weight per cubic inch convenient for quick estimates. The formula is simple: calculate volume, multiply by density, then multiply by quantity. The hard part is choosing the right density basis and confirming whether the geometry includes holes, tapers, chamfers, or ground allowances.
Where the calculator helps
The Extramet calculator helps buyers estimate part or blank weight before requesting a quote, planning freight, or comparing material choices. It is especially useful for carbide blanks, rods, discs, blocks, and simple components where approximate geometry is known.
What to include in an RFQ
- Grade or grade family, if known
- Drawing, shape, and all dimensions used for the weight estimate
- Quantity, finished versus oversize dimensions, and grind allowance
- Whether the weight estimate is for material only, customer-supplied material, or finished parts
If the grade is unknown, review carbide grades before finalizing the estimate.
Why grade-specific density matters
A carbide grade with more binder will not weigh the same as a grade with a different binder level or composition. For a rough purchasing estimate, a generic value may be close enough. For quoting, freight, or inventory planning, grade-specific density is the better basis.
If the drawing includes holes, reliefs, tapers, or finish allowance, the simple cubic-inch estimate should be treated as an approximation until the final geometry is reviewed.
Use weight estimates as planning data
A weight-per-cubic-inch estimate is most useful when it helps answer a practical question: material cost, freight planning, handling, balance, or whether a blank size is reasonable before finishing. It should not replace a grade-specific review when the quote depends on exact density or finished geometry.
For close estimates, send the grade, drawing, oversize dimensions, finished dimensions, quantity, and any holes or features that change volume.