Airtac JSI Series Standard Cylinder JSI40X350S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X350S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 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 JSI40X350S
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X350S is a double-acting JIS-standard profile cylinder built for tight machinery layouts. It is purposefully 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 is ready for CMSE or DMSE sensors that drop directly into the side grooves for position detection. The G1/4 port and M14x1.5 rod thread handle the 350 mm travel across a 30-800 mm/s speed range. For practical sizing, plan for about 377 N of real work at 0.5 MPa, which lifts roughly 32 kg vertically with a 2:1 safety margin.
Airtac JSI Series Standard Cylinder JSI40X350S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X350S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 JSI40X350S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×350 | 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 JSI40X350S Is Used
Packaging Line Diverter
Shifts light cartons across a 350 mm gap with 628 N of push force, fitting neatly into compact conveyor frames.
Palletizer Stopper Gate
Acts as a pneumatic stop for incoming pallets, using the built-in magnet to confirm gate position via DMSE sensors.
Small Parts Ejector
Pushes molded plastic parts out of a press area, relying on the hard-anodized barrel for abrasion resistance.
Is the Airtac JSI Series Standard Cylinder JSI40X350S the Right Cylinder?
When sizing this 40 mm bore, dropping down to a JSI32 gives 402 N push at 0.5 MPa, while stepping up to a JSI50 yields 982 N for heavier demands. The integrated -S magnet pairs perfectly with CMSE or DMSE switches for end-of-stroke confirmation. Remember that standard air cushions only decelerate the piston near the end caps; they do not act as a brake. If the machine loses air, the load will drift, so fit an external rod lock or pilot-operated check valve for secure holding. Because the 350 mm stroke is relatively long, use an external guide to prevent rod bending and absorb side loads.
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 JSI40X350S FAQ
This 40 mm bore cylinder features 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.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. It uses a hard-anodized aluminum barrel with no external rods, and the -S version includes a magnet for side-groove sensors.
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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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