English to Spanish Tech/Engineering Engineering (general) gradacion de suelo

Se me dificulta la traducción de estos 2 términos al español:
"Typically, if the maximum particle size is equal to or less than 4.75 mm (No. 4 sieve), then single-set sieving is applicable. Furthermore, if the maximum particle size is greater than 4.75 mm (No. 4 sieve) and equal to or less than 9.5 mm (3⁄8-in sieve), then either single-set sieving or composite sieving is applicable." Desde ya muchas gracias!