Airtac JSI Series Standard Cylinder JSI40X300STC
The AirTAC Airtac JSI Series Standard Cylinder JSI40X300STC is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 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 JSI40X300STC
Delivering 628 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder saves valuable machine space by being noticeably shorter than an equivalent ISO 15552 unit of the same 40 mm bore. 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. A built-in piston magnet allows CMSE or DMSE switches to drop directly into the side grooves for position sensing.
At 0.5 MPa you can plan for roughly 377 N of real work, which translates to lifting about 32 kg vertically with a 2:1 safety margin. The unit features a 16 mm rod, an M14x1.5 rod-end thread, and a G1/4 port. Adjustable air cushions at both ends absorb kinetic energy near the stroke limits, operating reliably across a 30-800 mm/s speed range.
Airtac JSI Series Standard Cylinder JSI40X300STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X300STC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 JSI40X300STC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×300 | 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 JSI40X300STC Is Used
Package Diverting
Pushes light cartons between sorting lanes on a packaging conveyor, utilizing the 300 mm stroke and 377 N safe working load to deflect items smoothly.
Pallet Strapping
Actuates the tensioning head on an automated pallet strapping machine, where the compact JIS profile fits neatly within tight structural clearances.
Component Ejection
Ejects molded plastic parts from a vertical press, using the built-in magnet and DMSE sensor to confirm full retraction before the mold closes.
Is the Airtac JSI Series Standard Cylinder JSI40X300STC the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm bore drops the 0.5 MPa push force to 402 N, while stepping up to a 50 mm bore increases it to 982 N. The included TC trunnion mount provides a pivoting centerline ideal for articulating mechanisms. Because this model features a 300 mm stroke, external guides are strongly recommended to prevent rod bending and premature seal wear caused by side loads. Note that the air cushion only decelerates the piston near the end of travel; it will not hold a load if air pressure is lost or the valve is centered. For suspended loads, 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 JSI40X300STC FAQ
This 40 mm bore cylinder uses a G1/4 port. The thrust outputs are 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 is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. The S designation means it has a built-in magnet for CMSE/DMSE sensors, and the TC suffix indicates it uses a trunnion mount for pivoting applications.
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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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