Airtac JSI Series Standard Cylinder JSI40X25STC
The AirTAC Airtac JSI Series Standard Cylinder JSI40X25STC 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 JSI40X25STC
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X25STC is a JIS-standard double-acting profile cylinder built for tight machinery layouts. It is intentionally shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore, saving valuable space without sacrificing performance. The extruded hard-anodized aluminum 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, it readily accepts CMSE or DMSE reed and electronic switches that drop directly into the side sensor grooves. For practical sizing, plan for about 377 N of real work at 0.5 MPa, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin. The unit features a G1/4 port, an M14x1.5 rod thread, and adjustable air cushions at both ends to smooth out the 25 mm stroke.
Airtac JSI Series Standard Cylinder JSI40X25STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X25STC |
|---|---|
| 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 JSI40X25STC
| 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 JSI40X25STC Is Used
Package Diverting
Ideal for pushing light parcels on a conveyor belt, where the 628 N push force easily handles boxes within the 32 kg vertical lift equivalent range.
Small Part Ejection
Ejecting molded plastic or aluminum widgets from a press, utilizing the compact 25 mm stroke and hard-anodized barrel for high-cycle durability.
Clamp Actuation
Securing workpieces in a machining fixture, where the -S magnet and CMSE sensors confirm clamp position to the controller.
Is the Airtac JSI Series Standard Cylinder JSI40X25STC the Right Cylinder?
When sizing this 40 mm bore, verify if the 32 mm option (providing 402 N push at 0.5 MPa) is sufficient, or if you need to step up to the 50 mm bore (offering 982 N push at 0.5 MPa) for heavier loads. The TC trunnion mount on this unit provides a pivot axis suited to articulated mechanisms. Since this is a double-acting cylinder, air drives the rod in both directions, but it will not hold a load if air pressure drops or the valve is centered—the piston will drift. For suspended loads, integrate an external rod lock or a pilot-operated check valve. The end-of-stroke cushions only decelerate the piston, they do not act as a brake.
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 JSI40X25STC FAQ
This 40 mm bore cylinder 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 operates at speeds between 30-800 mm/s.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. This space-saving design uses an extruded aluminum barrel without external rods, making it highly suitable for tight machine envelopes.
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Covers non-human-caused product damage.
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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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