Technical Foundation
What Is a Cylinder Bracket?
A cylinder bracket is the mechanical interface that anchors a hydraulic or pneumatic cylinder to a machine frame, transmitting the cylinder's push/pull force into the structure while, in many designs, allowing the cylinder to pivot as the load geometry changes through the stroke. Bracket selection depends on both the cylinder's bore size and mounting-standard footprint (NFPA in North America, ISO 6020/6022 elsewhere) and on whether the application needs a fixed mount or one that accommodates angular movement.
Clevis and trunnion mounts allow the cylinder to pivot in-line with the direction of travel, needed wherever the load's angle relative to the cylinder changes during the stroke — common in lift and tilt applications. Flange and foot mounts are rigid, fixed-position mounts used where the cylinder's centerline stays constant relative to the frame throughout the stroke, typically in press and clamping applications.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Mount Style | Clevis, trunnion, flange (head/rear), foot | Clevis/trunnion allow pivoting motion; flange/foot mounts are rigid and fixed in position |
| Bore Size Match | Must match the cylinder's actual bore, e.g. 2", 3", 4" | A mismatched bracket won't align with the cylinder's mounting bolt pattern or pin bore |
| Mounting Standard | NFPA (North America) vs. ISO 6020/6022 (metric) | Bracket bolt patterns and dimensions differ between standards even for a similar bore size |
| Load Rating | Rated static and dynamic force capacity | Must exceed the cylinder's maximum rated output force with an appropriate safety margin |
| Pin/Bushing Material | Hardened steel pin, bronze or composite bushing | Determines wear life and allowable side-load at the pivot point in clevis and trunnion mounts |
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Applications
Where Cylinder Brackets Get Used
Cylinder brackets are specified anywhere a hydraulic or pneumatic cylinder needs a defined, load-rated connection to a machine frame.
Mobile & Off-Highway Equipment
Clevis and trunnion mounted cylinders on excavator arms, dump beds, and loader booms where cylinder angle changes through the lift stroke.
Industrial Presses & Clamping Fixtures
Rigid flange or foot mounted cylinders holding a fixed centerline for repeatable press and clamp force application.
Material Handling Equipment
Cylinder brackets on lift tables, tilt platforms and conveyor diverter mechanisms.
Agricultural Machinery
Trunnion and clevis mounts on implement lift and fold cylinders subject to varying load angles.
Automation & Robotics
Precisely located flange mounts positioning pneumatic cylinders within fixed automation cell geometry.
Marine & Deck Equipment
Corrosion-resistant cylinder brackets on deck cranes, hatch covers, and steering cylinders.
FAQ
Cylinder Brackets Questions, Answered
How do I choose between clevis, trunnion, flange and foot mounts?
The choice depends on whether the cylinder needs to pivot during operation. Clevis mounts (pinned at the cylinder's cap end) and trunnion mounts (pinned mid-body) both allow the cylinder to swing as load geometry changes through the stroke — used in lift and tilt applications. Flange and foot mounts hold the cylinder rigidly in a fixed position and orientation, used where the load path stays constant, such as in presses and clamping fixtures.
Does the bracket need to match NFPA or ISO standard specifically?
Yes — NFPA (common in North America) and ISO 6020/6022 (common internationally) define different bolt patterns and mounting dimensions for a given bore size, even though the nominal bore sizes may overlap. A bracket built to the wrong standard won't align with the cylinder's mounting holes or pin bore. Check the cylinder's nameplate or datasheet for its mounting standard before ordering a bracket.
What load rating should I look for on a cylinder bracket?
The bracket's rated capacity should exceed the cylinder's maximum theoretical output force (bore area times maximum system pressure) with a safety margin, not just the typical operating force. For clevis and trunnion mounts, also check the pin and bushing's rated side-load capacity, since off-axis loading during pivoting is a common source of premature bracket wear.
Can I mix bracket brands with a different cylinder brand?
Generally yes, as long as bore size and mounting standard (NFPA or ISO) match exactly between the bracket and cylinder — these are standardized dimensions specifically so components from different manufacturers interchange. Always verify against the cylinder's actual dimensional drawing rather than assuming compatibility from bore size alone, since minor variations exist between manufacturers.
What causes premature wear in clevis and trunnion mount pivot points?
The most common cause is side-loading beyond the pin and bushing's rated capacity, often from misalignment between the cylinder's travel path and the load's actual direction of movement. Insufficient lubrication and using an undersized or wrong-material bushing (e.g., steel-on-steel instead of a bronze or composite bushing) also accelerate wear. Periodic inspection of pin and bushing clearance is standard maintenance practice on high-cycle applications.
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