Airtac JSI Series Standard Cylinder JSI40X250
The AirTAC Airtac JSI Series Standard Cylinder JSI40X250 is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. Its no-tie-rod, hard-anodized profile barrel is more compact than an ISO 15552 cylinder of the same bore — a space-saver on tight machines.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM14×1.5
- CushionAdjustable, 20.5 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac JSI Series Standard Cylinder JSI40X250
Delivering 628 N of push force at 0.5 MPa, this double-acting 40 mm bore cylinder is built for tight machinery layouts. As a JIS-standard profile unit, it is noticeably shorter and more compact than an ISO 15552 cylinder of the same bore. The extruded hard-anodized aluminum barrel sheds external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. Operating speeds span 30-800 mm/s.
Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches. For sizing real tasks, plan for roughly 377 N of actual work at 0.5 MPa (about 60 percent of the rated push), which equates to lifting a 32 kg part vertically with a 2:1 safety margin. Air connects via a G1/4 port, and the M14x1.5 rod thread handles the 250 mm stroke extension.
Airtac JSI Series Standard Cylinder JSI40X250 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X250 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M14×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 20.5 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC JSI (JIS standard) datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G. Barrel: hard-anodized aluminum profile (no tie rods).
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac JSI Series Standard Cylinder JSI40X250
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensors. |
JSI-family variants: JSI (double acting), JSID (double rod), JSIJ (adjustable stroke). Mounting: LB / FA / FB / CA / CB / CR / TC / TCM1 / TCM2. Thread PT (blank) / G.
Where the Airtac JSI Series Standard Cylinder JSI40X250 Is Used
Package Diverting
Pushes lightweight cardboard cartons at 30-800 mm/s onto secondary packaging lines using 528 N of retract pull force.
Small Part Ejection
Ejects molded plastic components from a 40 mm bore press, utilizing the 628 N push force to clear the tooling quickly.
Vertical Pressing
Applies a controlled downward clamping load on assembly fixtures, safely lifting around 32 kg if the load must be raised vertically.
Is the Airtac JSI Series Standard Cylinder JSI40X250 the Right Cylinder?
When sizing this 40 mm bore unit against its neighbors, note that a smaller JSI32 yields 402 N of push at 0.5 MPa, while stepping up to a JSI50 provides 982 N. If your machine experiences air loss or a centered valve, this standard cylinder will drift and cannot hold a suspended load; the adjustable 20.5 mm air cushions only decelerate the piston near stroke ends rather than locking it. For secure vertical holding, add an external rod lock or a pilot-operated check valve.
Since this model lacks the -S suffix, it has no internal magnet and cannot host magnetic sensors. If your application requires position feedback, select the JSI40X250-S variant instead. Additionally, with a 250 mm stroke, ensure adequate external guide rails to prevent rod bending under any side-loading conditions.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Set cushions to minimum, then release gradually.
- check Use correct mounting accessory (LB/FA/FB/CA/CB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac JSI Series Standard Cylinder JSI40X250 FAQ
The JSI40X250 delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push and 739 N pull at 0.7 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa. It uses a G1/4 air port and features a 16 mm rod with an M14x1.5 thread.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. This space-saving design uses a hard-anodized aluminum extrusion without external rods, making it ideal for tight machine envelopes.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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