Airtac JSI Series Standard Cylinder JSI40X380S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X380S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 380mm 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
- Stroke380 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 JSI40X380S
Delivering 628 N of push force at 0.5 MPa, this double-acting 40 mm bore JIS-standard profile cylinder is purpose-built for tight machinery layouts. It is intentionally shorter and more compact than an ISO 15552 cylinder of the same bore, using an extruded hard-anodized aluminum barrel with no external rods to resist wear. The internal two-way piston seal retains grease for a long, low-friction service life, while the G1/4 port handles the 30-800 mm/s speed range. Because the model includes the -S suffix, it has a built-in piston magnet so CMSE or DMSE reed and electronic switches can drop directly into the side grooves.
For practical sizing, plan for about 377 N of real work at 0.5 MPa, which equates to lifting roughly 32 kg vertically with a 2:1 safety margin. The adjustable 20.5 mm air cushions at both ends only decelerate the piston near the stroke limits; they do not function as a brake. If your process loses air or the valve centers, the rod will drift, so an external rod lock or pilot-operated check valve is required to hold a suspended load.
Airtac JSI Series Standard Cylinder JSI40X380S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X380S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 380 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 JSI40X380S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×380 | 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 JSI40X380S Is Used
Carton Diverting
Pushes light packaging cartons across a conveyor belt using the 628 N push force, with the 380 mm stroke covering a wide transfer lane.
Vertical Part Lift
Raises small machined components weighing up to 32 kg through a 380 mm vertical range, relying on the built-in -S magnet for precise height confirmation.
Component Ejection
Ejects molded plastic parts from a tight-fitting press cavity, where the compact JIS profile saves valuable floor space compared to standard ISO 15552 units.
Is the Airtac JSI Series Standard Cylinder JSI40X380S the Right Cylinder?
When sizing this 40 mm bore, verify if the 32 mm bore (402 N push @0.5 MPa) is sufficient, or step up to the 50 mm bore (982 N push @0.5 MPa) for heavier loads. This unit ships with the -S magnet, making it fully compatible with CMSE and DMSE position sensors. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or I/Y/F/U rod knuckles.
Because the 380 mm stroke is relatively long, avoid applying lateral side-loads to the M14x1.5 rod end. To prevent rod bending and premature seal wear, guide the load externally and ensure the piston travels purely linearly.
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 JSI40X380S FAQ
The 40 mm bore has a G1/4 port and an M14x1.5 rod thread. It 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.
No, the adjustable air cushions only decelerate the piston near the end of the 380 mm stroke and do not act as a lock. If air is lost or the valve is centered, the rod will drift. Use an external rod lock or a pilot-operated check valve to hold suspended loads safely.
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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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