Airtac JSI Series Standard Cylinder JSI40X125STC
The AirTAC Airtac JSI Series Standard Cylinder JSI40X125STC 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 JSI40X125STC
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X125STC is a double-acting JIS-standard 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, you can drop CMSE or DMSE reed and electronic switches directly into the side sensor grooves for precise position detection. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which equates 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 smoothly decelerate the piston.
Airtac JSI Series Standard Cylinder JSI40X125STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X125STC |
|---|---|
| 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 JSI40X125STC
| 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 JSI40X125STC Is Used
Packaging Diverter
Uses the 125 mm stroke to push cartons between adjacent conveyor lanes at 628 N of push force.
Small Part Ejection
Ejects molded plastic parts from a press with reliable 528 N pull force on the retract stroke.
Clamp Actuation
Secures lightweight aluminum extrusions during machining via the TC trunnion pivot mount.
Is the Airtac JSI Series Standard Cylinder JSI40X125STC the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm bore drops the output to 402 N at 0.5 MPa, while moving up to a 50 mm bore increases it to 982 N. The included TC trunnion mount provides a pivoting centerline interface, ideal for accommodating slight misalignment in your linkage. Note that a standard cylinder will drift if air pressure is lost or the valve is centered; the end cushions only decelerate the stroke and do not act as a brake. Use an external rod lock or pilot-operated check valve if the load must be held securely in place.
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 JSI40X125STC 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. The air port is G1/4.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. The -S suffix means it has a built-in magnet for CMSE/DMSE sensors.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
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