China Hydraulic Cylinder Flange Suppliers & Manufacturer

ISO 6020/2 MF1 designates a head rectangular flange positioned at the rod gland end of the cylinder, whereas MF2 designates a cap rectangular flange positioned at the rear base. When selecting between them, the primary structural load direction determines the ideal choice: during a push stroke under high pressure, an MF1 front flange experiences direct axial tension against its mounting frame, while an MF2 cap flange experiences compression. Conversely, in heavy pulling applications, an MF2 flange bears full tensile fatigue. For high-pressure push operations, head flanges require strict bolt torque calculations to prevent face separation and seal extrusion.

Micro-leakage typically originates from two factors: insufficient surface finish on the sealing gland and micro-deflection of the flange under pressure cycling. We machine flange sealing spigots with Ra 0.8–1.6 µm finishes and incorporate precision O-ring glands paired with 90 Shore A polyurethane or FKM elastomer seals with virgin PTFE anti-extrusion back-up rings. Furthermore, for welded intermediate flanges, we employ multi-pass submerged arc welding (SAW) or automated gas metal arc welding (GMAW) followed by stress-relief heat treatment to prevent weld pore porosity and weldment cracking.

For severe duty cycles (mining, scrap processing, heavy excavators), we specify forged 42CrMo4 (AISI 4140) alloy steel, quenched and tempered to a core hardness of 28–32 HRC, providing high yield strength (>750 MPa) and superior Charpy V-notch toughness. For general-purpose mobile machinery, normalized C45E or high-strength micro-alloyed structural steel (Q355D / S355J2) provides excellent weldability and fatigue endurance. In marine and offshore environments, AISI 316L or 2205 Duplex Stainless Steels are machined to resist severe pitting corrosion from seawater aerosols.

Yes. Our multi-axis CNC machines and engineering CAM systems readily process both metric (ISO 6020/2, ISO 6022, DIN 24554) and imperial standard geometries (NFPA T3.6.7 R1, ANSI B93.10M). Whether you provide solid CAD models (STEP, IGES, Parasolid), PDF manufacturing drawings, or physical worn OEM samples for coordinate measuring and reverse engineering, our engineering department confirms 2D approval drawings with full geometric dimensioning and tolerancing (GD&T) before production starts.

Every export shipment includes a comprehensive Quality Assurance Dossier containing: (1) EN 10204 3.1 Material Test Reports certifying chemical analysis and mechanical pull tests; (2) Heat treatment verification curves; (3) Ultrasonic and Magnetic Particle NDT inspection certificates; (4) CMM dimensional inspection sheets detailing bore, pilot, and PCD tolerances; and (5) Coating thickness/salt-spray compliance logs.

Bolt pre-tension calculations follow VDI 2230 standards. The clamp load generated by the high-tensile fastener group (Class 10.9 or 12.9) must significantly exceed the hydraulic pressure separation force (Working Pressure × Bore Area) by a minimum safety factor of 1.4 to 1.6 to prevent flange face lift-off. Our engineering team provides customer-specific assembly torque sheets accounting for thread friction coefficients (µ = 0.10–0.14) and thread lubrication conditions.