2b thread class right-hand 28 thread quantity per inch two outer edges chamfered 40.0 deg min to 50 deg max by 0.030 in. min to 0.050 in. max deep, non- slotted surf finish 63.0 microinches
2b thread class right-hand 28 thread quantity per inch two outer edges chamfered 40.0 deg min to 50.0 deg max by 0.03 in. min to 0.05 in. max deep; two diametrically opposite curvedaxial grooves centered between two drive slots 0.170 in. min radius to 0.190 in max radius, bottom of groove extends to a depth 0.770 in. min, 0.790 in. max from axial center
3b thread class right-hand 71.675" overall length 0.552" overall width 28 thread quantity per inch navy special project nickel or copper or nickel surface treated
