The maintenance tolerances for sieves used in performing official inspection services shall be:
(a) Thickness of metal: ±0.0015 inch.
(b) Accuracy of perforation: ±0.001 inch from design specification.
(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 |