• Tolerance held is the variation to the actual size of a product from the stated size.
  • Standard tolerance indicates little variation to the stated dimension and the product is either slightly smaller or larger. For example, a product with standard tolerance might have a 1/8" width (+ or - 0.002").
  • Precision tolerance indicates a product has been manufactured closer to the stated dimension than standard tolerance. For example, a sheet with precision tolerance might have a 1/8" width (+ or - 0.001").
  • Oversized tolerance is always positive (+), guaranteeing the product is thicker than the stated dimension. For example, a product with oversized tolerance might have a 1/8" width (+ 0.002").
  • Undersized tolerance is always negative (-), guaranteeing the product is thinner than the stated dimension. For example, a product with undersized tolerance might have a 1/8" width (- 0.002").