brake chamber: Model ZM440Storke 64mmPort thread Z3/8"Bolt thread M16*1.5Bolt centre 120.7±0.3Push rod thread M18*1.5Push rod length 360mmAdmitting port angle 45°Clamp angle 135°Max operating pressure:1.0mpa Operating temperature range: -40°C——+80°C Operating pressure: 0.8Mpa Competitive Price Quality Approvals :good quality Capability to supply large number of products requested