PRAD system PRAD SYSTEM Solution tool PRAD system Overall length of standard type and long type, and corresponding Materials Max. Applicable class Length of thread Cutting TYPE ℓ ℓn ℓs Ds(reference)K ℓk standard type:L length Forming(P class)(ISO class) 12 27.4 (48) 6 - - 80 12 P6 ISO3 G9 n 15 30 (54) 8 - - 90 15 P6 ISO3 G8 n 18 35.9 (57) 10 - - 100 18 P6 ISO3 G8 n 21 39.9 (63) 12 - - 110 21 P7 ISO3 G10 n PRAD-40