USL
Quality
USL (Upper Specification Limit)
Upper Specification Limit
Highest acceptable value for a characteristic defined by design, customer or process requirements.
Examples
- 01The USL for the case hardness of a gear is 62 HRC, because harder parts become brittle.
- 02The supplier's data shows hardness values close to the USL, so the customer asks for a lower tempering temperature target.
- 03Parts above the USL are rejected, and the furnace temperature log is checked for the affected batch.