Airtac JSI Series Standard Cylinder JSI40X320STC
The AirTAC Airtac JSI Series Standard Cylinder JSI40X320STC is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 320mm 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
- Stroke320 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 JSI40X320STC
Generating 628 N of push force at 0.5 MPa, the AirTAC JSI40X320STC is a double-acting JIS-standard profile cylinder built for tight machinery layouts. Because it uses an extruded hard-anodized aluminum barrel instead of external rods, the overall envelope is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. The G1/4 port feeds a two-way piston seal that retains grease for long, low-friction service. With a 0.5 MPa input, plan for about 377 N of real work, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin.
This specific SKU includes the -S piston magnet, allowing CMSE or DMSE switches to drop directly into the side sensor grooves for position detection. Adjustable air cushions at both ends decelerate the 16 mm rod over a 20.5 mm stroke, smoothly handling the 320 mm travel distance. For applications needing opposing or adjustable reach, related types like the JSID double-rod or JSIJ adjustable-stroke variants exist.
Airtac JSI Series Standard Cylinder JSI40X320STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X320STC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 320 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 JSI40X320STC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×320 | 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 JSI40X320STC Is Used
Diverting Gate Actuation
Pushes lightweight routing flaps on a 40 mm bore conveyor line, using the 628 N push force to snap packages onto secondary belts at high speed.
Vertical Parts Elevator
Lifts tote bins weighing up to 32 kg in a compact packaging cell, benefiting from the shorter profile to fit within tight vertical machine columns.
Press Fit Subassembly
Drives small bearings into housings on an electronics assembly line, relying on the 20.5 mm adjustable air cushion to prevent end-of-stroke impact.
Is the Airtac JSI Series Standard Cylinder JSI40X320STC the Right Cylinder?
When sizing this 40 mm bore, dropping down to a JSI32 yields 402 N of push at 0.5 MPa, while stepping up to a JSI50 provides 982 N. The built-in -S magnet pairs perfectly with CMSE/DMSE sensors, and the included TC trunnion mount allows pivoting articulation. Because air pressure alone will not hold a load if air is lost or the valve is centered—the piston simply drifts—you must add an external rod lock or pilot-operated check valve for suspended loads. Furthermore, at 320 mm of travel, the extended 16 mm rod is vulnerable to bending; always use an external guide rail to prevent side-loading damage.
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 JSI40X320STC FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, push is 879 N and pull is 739 N. The theoretical maximum force is 128 kgf at 1.0 MPa. The air port size is G1/4.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. The -S suffix indicates a built-in piston magnet, which is required to use CMSE or DMSE electronic or reed sensors in the side grooves.
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