Heavy-Duty Hydraulic Cylinder with Solid Forged Piston Rod — 250 bar, Clevis Mount
Why a forged rod changes everything: stronger joints, zero weld fatigue, longer service life. Bore 110 mm, stroke 807 mm, rated at 250 bar. Built for mobile equipment, construction machinery, and industrial presses.
Why Choose a Forged Piston Rod?
Most hydraulic cylinders use welded rod-end attachments — a rod with a separately welded clevis or eye. This is cheaper, but the weld creates a stress concentration point that limits fatigue life under dynamic loading.
Our cylinders use a solid forged piston rod: the clevis end is forged integrally from a single piece of C45 steel bar stock. No weld seam. No heat-affected zone. The result:
- 3–5× higher fatigue resistance at the rod-eye junction compared to welded assemblies
- No weld inspection required — eliminates the weakest link in the chain
- Consistent grain flow — forging aligns the steel’s internal structure along the load path
- Longer service life in high-cycle applications (mobile equipment, presses, lifting platforms)
This is the same approach used in aerospace actuators and heavy mining equipment — applied here to standard industrial hydraulic cylinders. All components are produced on our own CNC machining lines.
Technical Specifications
Core Parameters
| Parameter | Value |
|---|---|
| Cylinder type | Double-acting |
| Bore diameter | 110 mm |
| Rod diameter | 60 mm |
| Stroke | 807 mm |
| Working pressure | 250 bar |
| Proof pressure | 525 bar (2.1× safety factor) |
| Max oil flow | 220 l/min |
| Port connections | G 1/2” BSP |
| Mounting | Double clevis (pin eye both ends) |
Materials
| Component | Material | Standard |
|---|---|---|
| Cylinder tube | E355 seamless steel | EN 10297-1 |
| Piston rod | C45 solid forged | EN 10083-2 |
| Rod surface | Hard chrome ≥ 25 μm | — |
| Seals | NBR (nitrile) | — |
| Paint | RAL 7004 Signal Grey, 150 μm total | — |
Why E355 + C45?
E355 (≈ DIN St52) is the industry-standard hydraulic cylinder tube material — 355 MPa yield strength, excellent machinability, proven in cylinders up to 250 bar. No exotic alloys, no supply chain risk.
C45 (AISI 1045) for the rod provides the right balance: hard enough for chrome plating adhesion (HV 850–1050 chrome surface), tough enough to absorb shock loads without brittle fracture. The solid forging process further refines the grain structure compared to bar stock that’s simply turned.
Sealing System
Seal arrangement designed for 250 bar continuous duty:
- Piston: T-seal + guide rings — low-friction, high-pressure rated
- Rod: U-seal + O-ring with back-up ring — zero-leak at rated pressure
- Wiper: double-lip design — keeps contaminants out
- Brands: Hallite, Parker, Merkel, or Trelleborg — customer preference
All seals are field-replaceable without special tooling.
Mounting Options
This cylinder features double clevis (pin eye) mounting — the most common choice for:
- Mobile hydraulic equipment
- Articulating arms and booms
- Tipping trailers and dump bodies
- Agricultural implements
- Construction machinery (excavators, loaders)
Clevis mounting allows angular misalignment during stroke, reducing side-loading on the rod seal. Both the rod-end and base-end clevises accept standard clevis pins per ISO 8132.
Need a different mounting? We manufacture cylinders with flange, trunnion, and cross-tube configurations. See our full hydraulic cylinders range or contact us with your requirements.
Quality & Testing
Every cylinder is individually tested before shipping:
| Test | Specification |
|---|---|
| Proof pressure test | 525 bar, held for minimum duration |
| Leak test | Zero external leakage at rated pressure |
| Stroke function test | Smooth extension/retraction, no stick-slip |
| Chrome thickness | ≥ 25 μm verified by gauge |
| Paint DFT | ≥ 150 μm total (primer + topcoat) |
| Material traceability | EN 10204 Type 3.1 mill certificates |
Each cylinder receives a unique serial number engraved on the body for full traceability. Read more about our quality management system.
Forged Rod vs. Welded Rod — Head-to-Head
| Solid Forged Rod | Welded Rod Assembly | |
|---|---|---|
| Fatigue life | Excellent — no stress riser | Limited by weld quality |
| Failure mode | Gradual, predictable | Sudden weld crack propagation |
| Inspection | Visual only | NDT (UT/MT) recommended |
| Weight | Slightly heavier | Lighter |
| Cost | Higher upfront | Lower upfront |
| Best for | High-cycle, safety-critical | Low-cycle, cost-sensitive |
Bottom line: if your application involves more than 50,000 load cycles or if cylinder failure creates a safety risk — forged rod is the engineering choice, not the premium option.
Frequently Asked Questions
What does “solid forged piston rod” mean?
The clevis (mounting eye) at the end of the piston rod is not welded on — it’s forged from the same piece of steel as the rod itself. The bar stock is heated and shaped by forging dies to form the eye, creating a monolithic part with no joints. This eliminates the most common failure point in hydraulic cylinders: the rod-to-eye weld.
Can I get this cylinder with a different stroke or bore?
Yes. The 110/60 bore-to-rod ratio is one standard configuration. We manufacture custom cylinders from 40 mm to 300 mm bore, with strokes up to 3000 mm. Request a quote with your specifications.
What pressure rating is available?
Standard configurations: 160, 200, 250, and 350 bar working pressure. Higher ratings are available with thicker tube walls and upgraded seals. Proof testing is always performed at minimum 1.5× working pressure.
Do you supply replacement seal kits?
Yes. Every cylinder ships with a spare seal kit as standard. Additional kits can be ordered separately using the cylinder serial number.
What is the lead time?
Typical lead time for a batch of custom forged-rod cylinders is 6–8 weeks from drawing approval, depending on material availability and batch size. Contact us for a confirmed schedule.
Which industries use forged-rod cylinders?
Construction machinery, mining equipment, marine deck equipment, industrial presses, mobile cranes, forestry equipment, and any application where cylinder failure would cause safety hazards or costly downtime.
Order a Custom Cylinder
Every cylinder we build starts with your drawing or specification. Send us:
- A technical drawing (PDF, DWG, or STEP)
- Or a specification: bore, rod diameter, stroke, pressure, mounting type
Our engineering team will review your requirements and provide a detailed quotation within 48 hours.
Email: office@hydroforce.ee Request a quote: hydroforce.ee/contact