Wholesale Arm Hydraulic Cylinder fit Hyundai Excavators Use
Heavy-duty arm hydraulic cylinder built for Hyundai crawler excavators. Engineered with CNC-machined accuracy, chrome-plated rods, and multi-layer seal kits to withstand repetitive loading cycles and ensure precise stick (arm) control in daily excavation tasks.
| Cylinder Tube | Q345 / ST52 / 27SiMn / 20# Steel |
|---|---|
| Piston Rod | 45# / 40Cr / 42CrMo (Hard Chrome Plated) |
| Piston | Ductile Iron / Forged Steel (45# / 20Cr) |
| Cylinder Head | Q345 / 45# Steel / Cast Steel |
| Seals | Polyurethane (PU), NBR, FKM |
| Guide Bush | Bronze Alloy / Composite Materials |
| Ports & Fittings | Zinc-Plated Carbon Steel / Stainless Steel |
Quick Quote Request
Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
The arm hydraulic cylinder—also known as the stick cylinder—connects the boom to the arm and plays a critical role in controlling digging depth, reach, and bucket position.
In Hyundai machines such as R210LC-7, R220LC-9, and R290LC-7A, this cylinder performs continuous in-out motions during trenching, slope cutting, and lifting. It must absorb forward and reverse stress, maintain linear stroke precision, and resist side loads without flexing or leaking.
A worn or misaligned arm cylinder can result in digging inefficiency, seal blowouts, and excessive bushing wear—all of which reduce machine uptime and raise maintenance costs.
Material Quality and Structural Design
Our Hyundai arm cylinders are built from industrial-grade materials designed for strength, longevity, and ease of service:
- Barrel: Made from Q345B, ST52, or 27SiMn seamless steel pipe, honed to < Ra 0.2μm
- Rod: Forged from 42CrMo, then chrome-plated to ≥25μm thickness, hardness > HRC60
- End Caps & Pistons: Fully CNC-machined and robot-welded for consistent assembly and pressure resistance
Highlights
- Tight pin-to-eye tolerances (±0.05mm) for accurate mounting
- Seamless tube structure minimizes internal deformation
- Built-in grease grooves and replaceable bushings available upon request
Cylinder Manufacturing Process
Each Hyundai arm cylinder follows our 100% quality-controlled workflow:
Rod Polishing & Surface Prep
The piston rod is ground and polished to achieve a mirror-smooth surface, ready for hard chrome plating. This step reduces wear on seals and ensures long-lasting hydraulic performance.
Assembly & Sealing
In a cleanroom assembly area, the barrel, piston, rod, and end caps are fitted and torqued to spec. Seal kits are carefully installed to prevent fluid loss and contamination.
Pressure Testing & Export Packaging
Each cylinder is tested to withstand 1.5× working pressure and checked for leaks, stroke alignment, and valve performance. Final products are sealed and packed in export-grade wooden crates.
OEM Undercarriage Parts for Hyundai Excavator
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| HYUNDAI | R55 | R55-3 | R55-7 | R60 | R60-7 | R60CR-9 | R75-7 | R80 |
| R80-7 | R80CR-9 | R130-5 | R130-7 | R140LC-9 | R145LCR-9 | R150 | R150LC-7 | |
| R160LC-3 | R180LC-3 | R200 | R200-5 | R210 | R210-3 | R210LC-3 | R210LC-7 | |
| R215-7 | R220-5 | R220LC-9 | R225-7 | R235LCR-9 | R250LC-3 | R260-5 | R260LC-9 | |
| R265 | R275 | R290 | R290LC-3 | R290LC-7 | R300 | R300-5 | R300LC-9 | |
| R305 | R320 | R320LC-9 | R330LC-9 | R360 | R360LC-9 | R380LC-9 | R385 | |
| R420 | R450-3 | R450-5 | R450LC-7 | R480LC-9 | R500LC-7A | R520LC-9 | R800LC-7A | |
| HX90A | HX1000L | HX130A LCR | HX145LCR | HX220L | HX235LCR | HX260L | HX300L | |
| HX330L | HX380L | HX480L | HX520L | HX800L | HW100A | HW140 | HW180 | |
| HW210 | ||||||||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Compatibility with Hyundai Excavators
This arm cylinder is compatible with a wide range of Hyundai models, including:
- R210LC-7 / R215-7 / R220LC-9 / R225LC-7
- R265LC-9 / R290LC-7 / R305LC-9 / R335LC-9
Not sure about fitment? Just send us your machine model, OEM code, or technical drawing—we’ll match and reply within 12 hours.
Maintenance & Replacement Tips
- Lubricate pin bores regularly to avoid metal scoring
- Inspect rod surface for pitting or scoring during servicing
- Replace seal kits every 1,000–1,500 hours or when seepage is detected
- Ensure no off-angle force is applied to mounting brackets during reassembly
Frequently Asked Questions (FAQ)
Q1: Can this arm cylinder be used on both R210LC and R220LC?
A: Yes, depending on the variant. Send us your serial number or cylinder length—we’ll verify fitment quickly.
Q2: Is a seal kit included with the cylinder?
A: Yes. All cylinders come fully assembled with seals installed. Replacement kits can also be ordered separately.
Q3: Do you support customization?
A: Absolutely. If your machine has a non-standard stroke, bore, or mounting, we can build to your drawing or match based on specs.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
Quick Quote Request
Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
