Airtac JSI Series Standard Cylinder JSI40X300S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X300S 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 JSI40X300S
Generating 628 N of push force at 0.5 MPa, this 40 mm bore double-acting actuator saves valuable machine space by being shorter and more compact than an ISO 15552 cylinder of the same bore. The extruded hard-anodized aluminum profile barrel eliminates external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. Because this SKU includes the -S magnet, you can drop CMSE or DMSE reed or electronic switches directly into the side sensor grooves for position detection.
At 0.5 MPa you should plan for about 377 N of real work, which means it lifts roughly 32 kg vertically with a 2:1 safety margin. The unit features a G1/4 air port, an M14x1.5 rod-end thread, and adjustable air cushions of 20.5 mm at both ends to decelerate the piston smoothly. It operates at speeds between 30 and 800 mm/s across a pressure range of 0.15-1.0 MPa.
Airtac JSI Series Standard Cylinder JSI40X300S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X300S |
|---|---|
| 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 JSI40X300S
| 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 JSI40X300S Is Used
Package Diverting
Pushes light cardboard cartons across sorting lanes using the 628 N push force without overwhelming the lightweight conveyor fixtures.
Vertical Parts Ejection
Lifts finished molded components out of a press die, utilizing the 300 mm stroke to clear the lower tooling completely.
Pneumatic Clamping
Secures aluminum extrusions during a cutting operation, applying reliable clamping pressure that easily retracts to allow rapid material feeding.
Is the Airtac JSI Series Standard Cylinder JSI40X300S the Right Cylinder?
When sizing this 40 mm bore actuator, verify your actual load requirements against its 628 N push and 528 N pull ratings at 0.5 MPa. If your application demands less force, stepping down to the 32 mm bore provides 402 N of push force; conversely, moving up to the 50 mm bore yields 982 N for heavier cycles. Since this model features the -S magnet, it is fully compatible with CMSE and DMSE position switches.
With its 300 mm stroke, you must account for potential rod bending under side loads—always use an external guide or ensure the load is rigidly supported to prevent premature seal wear. Additionally, remember that a standard double-acting cylinder drifts when air is lost or the valve is centered; the end cushions only decelerate the piston near stroke end and do not function as a locking brake. To hold a load securely in place, 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 JSI40X300S FAQ
This 40 mm bore cylinder features a G1/4 air port and an M14x1.5 rod thread. The force output is 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.
The JIS-standard extruded profile body is intentionally shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore, providing a space-saving footprint. It is not dimensionally interchangeable with ISO 15552, but it offers superior integration on tight machinery.
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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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