Alfa Laval Brass Gear, p/n 21717, 99121717, A990PC72 NSN 3020-00-174-5579. SPECS: AAQL Body Style Webbed, offset, solid ABSX Attachment Method Mounting hole AGJS Pitch Diameter 2.8750 inches nominal AJLA Teeth Quantity 46 ANTP Bore Style Plain both ends CMLK Mounting Hole Thread Series Designator Unc transversely through hub, first end CQLT Mounting Hole Nominal Thread Size 0.312 inches transversely through hub, first end CTQY Mounting Hole Type AND Quantity 1 plain transversely through hub, first end and 1 threaded transversely through hub, first end CWCD Nominal Outside Diameter 3.000 inches CWNH Tooth Form Standard CWPP Pressure Angle 14.5000 degrees CWQL Nominal Distance Between Body Face AND Protruding HUB END 0.660 inches first end CWRM Face Nominal Width 0.551 inches CWRS Bore Nominal Diameter 0.685 inches both ends CWTR HUB Style Designator Plain both ends CWTX HUB Nominal Diameter 1.181 inches second end CWTX HUB Nominal Diameter 1.850 inches first end CWZK Mounting Hole Nominal Diameter 0.242 inches transversely through hub, first end MATT Material Copper alloy overall MDCL Material Document AND Classification MIL-M-16576, grade A mil spec single material response overall STYL Style Designator One protruding hub, one flush hub WRD19 14051