Spring brake chamber Model number:Hv-s01 Product detailsT30/30dd Original no.: 925 302 002 0 Stroke:64/64mm bolt center: 120.7mm Port thread: m16*1.5 3/8"npt 3/8"npt Bolt thread: m16*1.5 m16*1.5 5/8"unc Push rod: m16*1.5 m16*1.5 5/8"unf Total push rod length:285mm