napa gold 1551 spin-on hydraulic filter - 5.2x3.66", 1-12thread napa our hd hydraulic filters feature a wirebacked synthetic or cellulose/poly/glass media w/ contaminant holding capacity that out performs many of our top competitors.; high strength, corrosion resistant cans, center tubes and end caps w/ superior sealing components insure a leak resistant , long lasting , high performing filter. attributes gasket i.d. (inches) : 2.415" gasket o.d. (inches) : 2.729" gasket thickness (inches) : .255" height (inches) : 5.209" hydraulic filter style : spin-on hydraulic filter o.d. (inches) : 3.663" thread size (inches) : 1-12 gasket i.d. (mm) : 61 mm gasket o.d.(mm) : 69 mm gasket thickness (mm) : 6 mm height (mm) : 132 mm o.d. (mm) : 93 mm