Airtac JSI Series Standard Cylinder JSI40X125
The AirTAC Airtac JSI Series Standard Cylinder JSI40X125 is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 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 JSI40X125
Delivering 628 N of push force at 0.5 MPa, this 40 mm bore double-acting actuator fits tight machinery layouts by being shorter and more compact than an ISO 15552 cylinder of the same size. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while a two-way piston seal retains grease for a long, low-friction service life. It moves a 125 mm stroke at 30-800 mm/s through a G1/4 port.
Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which lifts roughly 32 kg vertically with a 2:1 safety margin. Adjustable 20.5 mm air cushions at both ends absorb end-of-stroke impact.
Airtac JSI Series Standard Cylinder JSI40X125 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X125 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 JSI40X125
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×125 | 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 JSI40X125 Is Used
Package Diverting
Pushes small totes at 90 degrees on a packaging line using 628 N of push force at 0.5 MPa.
Clamp Actuation
Extends a 125 mm stroke to secure aluminum extrusions for a drilling operation before release.
Gate Sorting
Cycles a lightweight pneumatic flap at 30-800 mm/s to route small hardware on an assembly machine.
Is the Airtac JSI Series Standard Cylinder JSI40X125 the Right Cylinder?
When sizing this 125 mm stroke model, verify if the 528 N pull force at 0.5 MPa is sufficient to retract your tooling; if not, stepping up to the 50 mm bore yields 825 N of pull. Conversely, the smaller 32 mm bore offers 345 N pull if your payload is lighter. For any application needing end-position feedback, you must select the -S magnet variant, as this base unit cannot host a sensor. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or an I/Y/F/U rod knuckle.
Note that a standard air cylinder drifts if air pressure drops or the valve is centered, as the cushion only decelerates the piston near stroke end rather than locking it. To suspend a vertical load securely during an outage, install an external rod lock or a pilot-operated check valve.
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 JSI40X125 FAQ
The 40 mm bore has a G1/4 port and an M14x1.5 rod thread. It generates 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.
No, this specific SKU does not include the -S magnet, so CMSE or DMSE switches cannot be used. You would need the -S variant for position sensing. The unit is also a JIS-standard profile cylinder, making it shorter and more compact than an ISO 15552 cylinder of the same bore.
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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.
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Most inquiries answered within 7-8 hours.
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