Airtac JSI Series Standard Cylinder JSI40X25S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X25S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 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 JSI40X25S
Generating 628 N of push force at 0.5 MPa, the AirTAC JSI40X25S is a double-acting JIS-standard profile cylinder built for tight machinery layouts. Its extruded hard-anodized aluminum barrel omits external rods, making the unit shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. The internal two-way piston seal retains grease, ensuring low-friction operation over a long service life.
This 25 mm stroke variant includes a built-in piston magnet, allowing CMSE or DMSE electronic switches to drop directly into the side sensor grooves for precise position detection. Plan for roughly 377 N of actual work at 0.5 MPa, which translates to lifting about 32 kg vertically with a 2:1 safety margin. The G1/4 port and M14x1.5 rod thread handle the pneumatic flow and mechanical connections for this bore size.
Airtac JSI Series Standard Cylinder JSI40X25S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X25S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 JSI40X25S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×25 | 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 JSI40X25S Is Used
Small Part Ejection
Uses the 25 mm stroke to rapidly push molded plastic parts out of an injection molding die, relying on the 628 N push force to overcome mold release friction.
Package Diverting
Actuates a short diverting arm on a packaging line, where the compact profile fits between tight conveyor frames and the magnet triggers the stroke-end sensor.
Clamping Mechanism
Secures lightweight aluminum extrusions in a machining fixture, applying safe holding pressure without deforming the workpiece.
Is the Airtac JSI Series Standard Cylinder JSI40X25S the Right Cylinder?
When sizing this 40 mm bore unit, the smaller JSI32 offers 402 N of push at 0.5 MPa, while stepping up to the JSI50 provides 982 N, giving you clear force scaling if the load changes. Because the -S suffix equips this model with a magnet, it is immediately ready for CMSE or DMSE sensors without further modification. For mounting flexibility, you can utilize LB foot brackets, FA/FB flanges, CA/CB clevises, or TC trunnions. Remember that standard pneumatic cushions only decelerate the piston near the stroke end; if air pressure drops, the rod will drift, so fit an external rod lock or pilot-operated check valve for suspended loads.
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 JSI40X25S FAQ
The 40 mm bore generates 628 N push and 528 N pull at 0.5 MPa, increasing to 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 operates at speeds between 30-800 mm/s.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The extruded aluminum barrel has no external rods, and the included -S magnet allows CMSE or DMSE sensors to slot directly into the side grooves.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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