A locking, 12-point Grade 8 capscrew sized 9/16-18 x 2-1/4 inches, built for Mack differential hardware. The pack contains ten identical fasteners for jobs needing multiple matching screws. Its 12-point head and locking design form a secure threaded joint that resists loosening under load.Interchanges:3AX1804This unit is sold in packs of 10.Features12-point head designLocking style capscrewGrade 8 fastenerThread size 9/16-18, length 2-1/4 in.Sold as a pack of 10Tech SpecsType: Locking capscrew, Grade 8, 12-point headThread and length: 9/16-18 x 2-1/4 in.Pack quantity: 10 piecesUsed in these Mack modelsCRD 93 / CRD 113 DifferentialCRDPC 92 / CRDPC 112 Differential