Description
QY350??59??003 Hydraulic Cylinder
63mm Bore ?? 35mm Rod ?? 140mm Stroke
Built from seamless 27SiMn steel tubing, the QY350??59??003 delivers exceptional durability in continuous-duty steering applications. The 63mm ?? 35mm bore/rod geometry produces optimal force characteristics over its 140mm working stroke.
QY350??59??003
63 mm
35 mm
140 mm
300 mm
Choose Ever-power custom hydraulic cylinders for ISO-certified production and comprehensive engineering.
Product Overview
The QY350??59??003 distinguishes itself through material discipline. Ever-power specifies cold-drawn seamless tubing for the 63mm bore, eliminating weld seam stress concentration. The 35mm rod is centerless ground before chrome plating for concentricity within 0.02mm. The generous 35mm rod provides exceptional column strength resisting buckling under load.
The QY350??59??003 is compatible with most forklift hydraulic systems operating at 16-21 MPa. System pressure exceeding 25 MPa requires consultation with Ever-power engineering to evaluate seal compatibility and barrel safety margins for continuous operation.
Key Features
Corrosion Protection
The barrel receives zinc-phosphate conversion coating prior to painting for enhanced adhesion and corrosion resistance. The 35mm rod chrome plating passes 96-hour neutral salt spray testing per ASTM B117, ensuring reliable outdoor performance in marine and chemically aggressive environments.
Flexible Porting Options
BSPP, NPT, or metric port threads are available in side, rear, or flange mounting orientations. This flexibility allows direct connection to existing hydraulic plumbing without adapter fittings, custom hose configurations, or line routing modifications.
Custom Rod End Fittings
Male and female threads, spherical bearings, clevis forks, or special end fittings are fabricated to customer dimensional drawings and validated load requirements. Custom configurations ship within 10-15 business days from drawing approval.
Export-Grade Packaging
VCI corrosion protection film, silica gel desiccant, and ISPM-15 certified plywood crating ensure damage-free international delivery. Packaging withstands ocean transit periods up to 45 days and multiple handling transitions through port and customs facilities.
Our hydraulic cylinder manufacturer expertise ensures every unit exceeds OEM benchmarks at lower lifecycle cost.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | QY350??59??003 |
| Bore Dia | 63.0 mm |
| Rod Dia | 35.0 mm |
| Stroke | 140.0 mm |
| Mounting | 300.0 mm |
| Max Pressure | 25 MPa |
| Hydro Test | 37.5 MPa |
| Burst Min | 62.5+ MPa |
| Operating Temp | -30??C to +100??C |
| Medium | Mineral Oil |
| Tube Material | 27SiMn Seamless |
| Chrome Layer | Hard Chrome 20+??m |
| Fixing Type | Pin Eye / Clevis |
| Port Size | G1/4 or M14x1.5 |
Working Principle
At system level, the QY350??59??003 is one component in a hydrostatic loop. The priority divider diverts pump output to the cylinder circuit. Oil enters the 63mm barrel pushing the piston sealed by polymer rings. The 35mm rod extends through the gland, its chrome surface preventing leakage across 140mm range. The orbitrol valve provides proportional response ?? small wheel movements produce small displacements.
Applications
In forklift steering, the QY350??59??003 replaces OEM cylinders on 1.5-ton to 5-ton capacity classes. The 63mm bore matches standard steering pump output ensuring compatible flow and pressure. Cold storage facilities value low-temperature seal performance where conventional units harden and leak. Port operations deploy this on reach stackers and straddle carriers where steering reliability directly impacts container throughput and vessel turnaround times.
Brand Compatibility
This 63mm bore cylinder directly replaces OEM actuators on Clark, Doosan, and Hyundai forklift series. Ever-power maintains a dimensional database cross-referencing over 2,000 OEM part numbers ensuring physical and hydraulic compatibility without machine modification. Fleet managers running mixed-brand operations appreciate inventory consolidation ?? one Ever-power part number replaces multiple OEM references while maintaining OEM-level performance and reliability in demanding shift work.
Explore our resource on single acting hydraulic cylinder for installation tips and maintenance.
Customization Options
Beyond the standard 63mm ?? 35mm ?? 140mm, Ever-power offers engineering to modify this cylinder for unique installations. Our team reviews drawings and delivers tailored solutions in 10-15 business days.
Stroke
Extended/reduced from 140mm. Max depends on 35mm rod buckling.
Ports
BSPP, NPT, SAE in side, rear, or manifold orientations.
Rod End
Male/female threads, spherical bearings, clevis forks.
Seals
Viton for heat, PU for abrasion, PTFE for low friction.
Manufacturing & Quality
Manufacturing begins with material inspection ?? 27SiMn steel at 520MPa yield verified. CNC turning machines shape the 63mm barrel OD and cap threads to H8. Honing produces the critical bore finish. Pistons are CNC’d from ductile iron with PTFE bands, assembled in Class 1000 cleanroom. Every cylinder pressure-tested at 1.5?? rating for 60 seconds.
Material
63mm barrel, mill certs
CNC
63mm bore honed H8
Chrome
Rod ??20??m, HV900
Assembly
Cleanroom, torqued
Test
1.5??, 60s hold
CMM
Dimensional report
How to Select the Right Hydraulic Cylinder
Specifying the correct hydraulic cylinder requires matching physical dimensions, force requirements, and environmental conditions. For the 63mm bore, 35mm rod, 140mm stroke, and 300mm mounting distance of your application, verify each parameter systematically against your equipment drawings and operating specifications to ensure proper fit and function.
- Verify Bore Diameter
The 63mm bore produces 62N at 20 MPa. Measure existing bore or calculate from system pressure and required force. Ensure the bore matches your hydraulic pump output and valve capacity. - Confirm Rod Diameter
The 35mm rod must withstand side loads from steering linkage. Verify rod end threads match knuckle arm. Check chrome surface is free of scoring that would damage seals during operation. - Measure Stroke Length
Measure full linear travel from retracted to extended. The 140mm stroke must equal or exceed this distance. Consider internal cushioning requirements for smooth deceleration.
Structural Components
The 63mm barrel forms the pressure vessel from seamless 27SiMn tubing with honed interior serving as piston bearing surface. End caps are precision-threaded steel forgings containing inlet ports and attachment points. Inside, the ductile iron piston with PTFE wear rings divides the barrel into two pressure chambers. The 35mm rod extends through the gland combining wiper seal, rod seal, and bearing sleeve. Static O-rings seal barrel-to-cap joints; threading rather than welding enables future rebuild.
Cylinder Barrel
63mm honed seamless 27SiMn steel, H8 tolerance
Piston Rod
35mm hard chrome plated, HV??900, Ra 0.4??m
Piston
Ductile iron with PTFE wear bands
Gland
Threaded cartridge: seal, bearing, retention
Ever-power Technical Deep Dive
Innovation
Ever-power’s R&D for 63mm bore includes embedded BLE sensors, composite barrels (-35% weight), and additive-manufactured pistons with damping channels (-40% shock). The 35mm rod PTWA coating achieves HV 800-1000 with 500+ hour salt-spray resistance.
Frequently Asked Questions
Sub-zero operation?
Standard NBR to -30??C. LT-NBR for -30??C to -40??C. Silicone/HNBR below -40??C. Barrel stays ductile to -50??C. Warm up system before full demand.
Prevent rod corrosion outdoors?
Specify nickel-chrome duplex (96hr salt spray), ceramic coating (500+ hr), or rod boot. Apply corrosion inhibitor for stationary periods.
Port size for 63mm bore?
Standard G1/4 BSPP or M14??1.5. Requires ~43.0L per cycle. At 10-20 L/min pump flow, extension is 1-2 seconds. G3/8 or SAE-6 for higher flow.
Repairable or disposable?
Fully repairable ?? threaded construction allows disassembly for re-honing, re-chroming, seal replacement. Rebuild kits at 30-40% of new. Factory reman available with 12-month warranty.
Get Your Quote Today
Experience Ever-power with the QY350??59??003. Every cylinder ships with test certificate and 12-month warranty. Seal kits and support ensure long-term reliability.
Ever-power Manufacturing | ISO 9001 | Global Shipping | QY350??59??003
