This guide supports Extramet’s tungsten carbide blanks by answering the practical engineering and purchasing questions that usually come before an RFQ.
Quick Answer
- A blank should be specified around the finished part and the finishing process.
- Grade selection should reflect wear, impact, corrosion, and geometry.
- Grind allowance must be clear before quoting custom blanks.
| Blank detail | What to define | Why it matters |
|---|---|---|
| Geometry | Round, rectangular, near-net, or custom | Controls material yield and finishing plan |
| Grade | Binder, grain size, or application target | Controls wear and toughness |
| Allowance | Oversize and grind stock | Controls finishing time and risk |
| Finish | As-sintered, rough-ground, finish-ground | Controls price and downstream work |
Start with the finished component
Custom blanks should be built backward from the finished part. The drawing should make clear which features are final, which are oversize, and which will be ground after sintering or stock preparation.
Grade and grind allowance work together
A very wear-resistant grade can be harder to finish. A tougher grade may be selected for impact or chipping risk. The blank size should leave enough material for cleanup without adding unnecessary grinding time.
How to avoid quote delays
The fastest carbide blank quotes usually include a print, target grade, quantity, tolerance, finish, and a note on where the blank will be finished. If the print is still in design, send the application requirements too.
What to Include in an RFQ
- finished drawing
- blank form and oversize allowance
- grade or failure mode
- finish, tolerance, and quantity
Related Extramet Resources
Reviewed for technical accuracy: This supporting article was prepared to align with Extramet’s tungsten carbide manufacturing, grinding, inspection, and quality capabilities in Latrobe, Pennsylvania.
Frequently Asked Questions
What is grind allowance?
Grind allowance is extra material left on the blank so the final surface can be ground to size and finish.
Can a blank be too oversized?
Yes. Too much oversize adds grinding time, cost, and material use without improving the final part.
Should I specify grade before geometry?
Specify both together when possible. Grade can affect manufacturability, edge condition, and finishing strategy.