Description
HK-DY-12 Hydraulic Cylinder
50mm Bore ?? 32mm Rod ?? 500mm Stroke
Designed to meet the rigorous demands of modern forklift steering systems, the HK-DY-12 hydraulic cylinder from Ever-power combines a 50mm honed bore with a 32mm chrome-plated piston rod, providing smooth linear motion through 500mm of controlled travel.
HK-DY-12
50 mm
32 mm
500 mm
730 mm
As a trusted single acting hydraulic cylinder, Ever-power delivers actuators that meet OEM specifications for material handling.
Product Overview
Ever-power engineers the HK-DY-12 for extended service intervals. The 50mm barrel is CNC-machined from 27SiMn seamless steel with full mill certification. The 32mm rod features Ra ?? 0.4??m chrome surface minimizing friction during high-frequency steering corrections. The compact 50mm bore generates sufficient steering force for light-to-medium forklifts.
For optimal performance, specify hydraulic fluid viscosity grade appropriate for your operating temperature range. The 50mm bore and 32mm rod are optimized for ISO VG 46 mineral oil but accommodate VG 32 through VG 68 with corresponding seal compound selection at order time.
Key Features
Seamless Construction
Machined from 27SiMn seamless alloy tubing, the 50mm barrel eliminates the stress riser inherent in welded pipe construction. This provides superior fatigue resistance through millions of steering cycles under varying pressure amplitudes and directional loading conditions.
Micro-Finished Rod
The 32mm piston rod is centerless ground to Ra 0.4??m before hard chrome plating. This surface finish ensures concentric operation that extends seal life by reducing lip wear, friction heat generation, and breakout pressure during steering corrections.
Temperature Resilience
Nitrile primary seals maintain elastomeric properties from -30??C to +100??C standard operating range. Viton compound upgrades are available for continuous operation above 80??C or for compatibility with synthetic hydraulic fluids and phosphate ester media.
Complete Traceability
Material certification with mill test reports accompanies every cylinder. Serialized batch codes etched on the barrel enable complete production history retrieval from raw steel billet through final inspection and pressure testing verification.
This demonstrates why Ever-power is preferred for industrial hydraulic cylinders among fleet operators.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | HK-DY-12 |
| Bore Dia | 50.0 mm |
| Rod Dia | 32.0 mm |
| Stroke | 500.0 mm |
| Mounting | 730.0 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
The HK-DY-12 converts hydraulic power into linear steering motion. The pump sends flow through a priority valve ensuring the steering circuit receives volume even when lift and tilt demand simultaneously. Fluid enters the 50mm bore, displacing the piston. The 32mm chrome rod translates pressure through 500mm travel. On return, fluid exits to the reservoir via filter. Cushions decelerate the piston near stroke end.
Applications
In forklift steering, the HK-DY-12 replaces OEM cylinders on 1.5-ton to 5-ton capacity classes. The 50mm 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
Engineered for interchangeability, this unit matches mounting envelope, port geometry, and force characteristics of factory cylinders on Doosan material handling equipment. Pin-eye and clevis dimensions conform to OEM specifications used by Hyundai and Toyota, allowing direct bolt-on replacement without adapters or bracket modifications. Aftermarket distributors stock this as a universal solution for Komatsu forklift families commonly found in rental and leasing fleets requiring rapid turnaround.
Visit our custom hydraulic cylinders page for documentation and troubleshooting guides.
Customization Options
Ever-power’s program addresses that no two OEM installations are identical. Whether non-standard 50mm bore, specialized rod end, or alternative sealing, our engineers develop cost-effective solutions.
Material
Stainless barrel for corrosion, alloy upgrades for 32mm rod.
Surface
Nickel-chrome duplex, ceramic, phosphate, marine paint.
Temp
Low-temp NBR to -40??C, Viton to +150??C.
Testing
Extended cycling, salt spray, custom acceptance criteria.
Manufacturing & Quality
Lean workflow through machining, finishing, assembly, test. Seamless tubing CNC-turned. Diamond abrasives achieve cross-hatch on 50mm bore. Rods centerless ground, chrome-plated, eddy-current inspected. Torque-monitored assembly. Static hold, dynamic cycling, over-pressure verification.
Steel In
27SiMn, 520MPa cert
Turning
50mm bore, H8 finish
Surface
Hard chrome, 20??m+
Build
Seals, PTFE bands
Verify
Pressure, zero leak
Measure
CMM all critical dims
How to Select the Right Hydraulic Cylinder
Selecting a replacement cylinder involves evaluation of multiple interdependent parameters. Use this framework to confirm the 50mm ?? 32mm ?? 500mm unit with 730mm mounting suits your equipment. Each parameter affects performance, installation compatibility, and service life in your specific operating environment.
- Check Mounting Dimensions
Center-to-center between pins must match 730mm ??2mm. Verify pin diameter compatibility. Check hose and fitting clearance at full extension without interference. - Pressure Compatibility
Confirm system operates at ??25 MPa with this 50mm bore. Verify pump flow produces acceptable extension/retraction speed for your steering response requirements. - Specify Seal Material
Standard NBR suits mineral oil at -30??C to +100??C. Select Viton for synthetic fluids or temps above 100??C. Specify PU for water-glycol mixtures at order time.
Structural Components
The 50mm barrel is the largest structural element, thick-wall seamless steel containing 25 MPa with 4:1 safety factor. The cap-end houses the inlet port and rear mounting ?? pin-eye or clevis lug machined integrally. The piston incorporates seal grooves and wear bands centering it within the 50mm bore. The 32mm rod resists axial tension and compression; hard chrome seals against the gland and withstands environmental exposure. The threaded rod gland integrates sealing, bearing, and retention in a replaceable cartridge.
Piston Rod
32mm hard chrome plated, HV??900, Ra 0.4??m
Piston
Ductile iron with PTFE wear bands
Gland
Threaded cartridge: seal, bearing, retention
End Caps
Steel forgings, CNC-machined, ported
Ever-power Technical Deep Dive
Seal Architecture
The triple-barrier in this 50mm bore addresses contamination, pressure loss, and extrusion. The PTFE-bronze wiper removes 50??m particles while maintaining 2??m oil film on the 32mm rod. The PU U-cup creates a self-energizing seal that improves with pressure.
Frequently Asked Questions
OEM direct replacement?
Yes ?? the HK-DY-12 interchanges with popular OEM 50mm bore cylinders. Dimensions, ports, and rod ends match factory specs. Cross-reference charts available.
Rod maintenance required?
Minimal ?? wipe chrome weekly, inspect monthly for scoring. Apply hydraulic oil for long storage. Replace wiper if torn. Never paint chrome.
Custom 500mm stroke available?
Absolutely ?? 50mm to 2,000mm for this 50mm bore. Engineering review for rod stability. No minimum quantity. Feasibility in 24 hours.
Warranty for HK-DY-12?
12 months against material and workmanship defects. Covers seals, barrel, chrome, threads under normal use. Excludes over-pressure, contamination, improper install.
Get Your Quote Today
Contact Ever-power for 50mm bore requirements. Our engineers review specs and recommend optimal configuration. OEM customers get dedicated account management.
Ever-power Hydraulics | ISO Certified | Export Worldwide | Ref: HK-DY-12
