Airtac JSI Series Standard Cylinder JSI40X390S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X390S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 390mm 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
- Stroke390 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 JSI40X390S
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 ISO 15552 cylinder of the same 40 mm bore. The extruded hard-anodized aluminum barrel features no external rods to resist wear, while the two-way piston seal retains grease for long, low-friction life. Equipped with a G1/4 port and a 390 mm stroke, it also includes a built-in magnet for position sensing.
For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin. The integrated -S magnet allows CMSE or DMSE switches to drop directly into the side grooves for precise end-of-stroke detection. If your application requires opposing or adjustable movements, explore the related JSID double-rod or JSIJ adjustable-stroke variants.
Airtac JSI Series Standard Cylinder JSI40X390S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X390S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 390 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 JSI40X390S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×390 | 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 JSI40X390S Is Used
Carton Diverting
Extends 390 mm to push corrugated cartons cleanly across a packaging conveyor using 628 N of 0.5 MPa thrust.
Vertical Parts Lift
Raises lightweight plastic bins between machinery tiers, safely handling roughly 32 kg loads with a 2:1 margin.
Gate Actuation
Opens and closes long-reach machine safety gates where the compact JIS profile saves critical floor space.
Is the Airtac JSI Series Standard Cylinder JSI40X390S the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm bore yields 402 N of push at 0.5 MPa, while stepping up to a 50 mm bore provides 982 N. Because this model features a 390 mm stroke, external guides are strongly recommended to prevent rod bending and manage side loads during long extensions. The included -S magnet pairs perfectly with CMSE or DMSE sensors for drop-in switching.
Remember that the adjustable air cushion only decelerates the piston near the end caps and does not function as a brake. If air pressure drops or the valve centers, the piston will drift; to safely hold a suspended load, 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 JSI40X390S FAQ
This 40 mm bore cylinder features a G1/4 port and generates 628 N push / 528 N pull at 0.5 MPa, 879 N push / 739 N pull at 0.7 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa. The piston rod is 16 mm with an M14x1.5 thread, and it operates at speeds between 30 and 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, giving you a space-saving footprint. It is not dimensionally interchangeable with ISO 15552, but it utilizes an extruded hard-anodized aluminum barrel with no external rods for a clean, resilient build.
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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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