Multi-stage Third Stage Boom Cylinder

Specification: 2-Stage Telescopic, Stage 1 110mm Bore x 97mm Rod x 1050mm Stroke, Stage 2 63mm Bore x 35mm Rod x 1050mm Stroke, Retracted 1550mm, Total Stroke 2100mm, Machine Tool Multi-Stage Cylinder 

Telescopic Hydraulic Cylinder,Multi Section Hydraulic Cylinders,Multi Stage Hydraulic Cylinder

Sequential stage deployment — outer stage 1 extends first to 1050mm stroke before inner stage 2 begins extension, eliminating the sudden force drop typical of single-stage actuators transitioning from high-pressure to low-pressure cavity during long-travel.

Retracted center distance 1550mm delivers 2100mm total stroke, 35% more stroke than a single-stage cylinder of identical closed length, critical for machine tool fixtures where the Hydraulic Station footprint constrains cylinder mounting space.

Hard chrome-plated rods on both stages, 97mm outer rod and 35mm inner rod, surface finish Ra under 0.15 um after diamond lapping, compatible with polyurethane U-cup seals on CNC fixture cycling at 8 strokes per minute continuous duty.

Stage-to-stage guide bushing PTFE-lined 50mm wide, radial clearance 0.05mm honed post-assembly, maintaining concentricity under 0.08mm total indicated runout across full extended stroke — within repeatability tolerance for machine tool positioning applications.

Stage transition cushioning by tapered port orifice machined into the stage collar, decelerating the inner rod by 40% velocity reduction over the last 15mm of stage 1 travel before stage 2 begins pressurization.

Bleed screw on each stage end cap for trapped air evacuation during first commissioning, all ports sealed with bonded washer and copper crush gasket on the flange face to prevent weep leakage at the 250 Bar static proof test.

Applied in CNC vertical machining center hydraulic fixture clamping, horizontal boring mill tailstock quill extension, transfer line pallet clamp, gantry mill rail clamp and automatic tool changer cylinder replacement on multi-axis machining centers.