The maintenance tolerances for sieves used in performing official inspection services shall be:

1. (a) Thickness of metal: ±0.0015 inch.
2. (b) Accuracy of perforation: ±0.001 inch from design specification.

3. (c) Sieving accuracy:

   Sieve description	Tolerance
   Direct comparison	Sample exchange
   .064 × 3⁄8 inch oblong	±0.2 percent, mean deviation from standard sieve using wheat	±0.3 percent, mean deviation from standard sieve using wheat
   5⁄64 × 3⁄4 inch slotted	±0.3 percent, mean deviation from standard sieve using barley	±0.5 percent, mean deviation from standard sieve using barley
   55⁄64 × 3⁄4 inch slotted	±0.5 percent, mean deviation from standard sieve using barley	±0.7 percent, mean deviation from standard sieve using barley
   6⁄64 × 3⁄4 inch slotted	±0.7 percent, mean deviation from standard sieve using barley	±1.0 percent, mean deviation from standard sieve using barley