Definition
A material specification identifies the exact material a part must be made from: typically a standard designation (such as an ASTM, EN or DIN grade), sometimes a specific heat or lot, and often a condition (annealed, hardened, a particular temper). "Aluminum" or "steel" alone is not a material specification; 6061-T6 or 1.4404 is.
Why the exact grade and condition matter
Material cost, machinability and achievable properties all depend on the exact grade and condition, not just the base material family, which is why a vague material callout is a common source of quoting risk.
Where it appears on the drawing
In the title block or a dedicated material note, typically referencing a standard designation and, where relevant, a heat treatment or condition.
Common mistakes
Quoting or planning a part based on a generic material name without confirming the exact grade, condition and any required certification, which can change both cost and machinability.
Material cost, machinability and achievable properties all depend on the exact grade and condition, not just the base material family, which is why a vague material callout is a common source of quoting risk.
See how Blake reviews a partFrequently asked questions
Is 'aluminum' a material specification?
Not on its own; a specification names an exact grade (such as 6061-T6) and often a condition or standard.
Does material specification affect machining time?
Yes, different grades and conditions machine differently even within the same base material family.
What if the drawing just says 'steel'?
That's underspecified; a work preparer or estimator normally has to clarify the exact grade before quoting or planning.