Airtac JSI Series Standard Cylinder JSI40X1200S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X1200S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 1200mm 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
- Stroke1200 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 JSI40X1200S
Generating 628 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder saves valuable machine space by being shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. It is equipped with a G1/4 port and an M14x1.5 rod thread.
Because the -S suffix denotes a built-in piston magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side sensor grooves for position detection. For practical sizing, plan for around 377 N of real work at 0.5 MPa, which means it lifts about 32 kg vertically with a 2:1 safety margin.
Airtac JSI Series Standard Cylinder JSI40X1200S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X1200S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 1200 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 JSI40X1200S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×1200 | 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 JSI40X1200S Is Used
Long-Reach Diverting
Pushes lightweight cartons across a 1.2-meter conveyor belt in packaging lines using its 628 N push rating.
High-Bay Extraction
Extracts totes from deep shelving racks where the 1200 mm reach and compact JIS profile minimize headspace.
Sample Transfer Arm
Moves test samples between distant lab stations, relying on the -S magnet and DMSE sensors for precise end-position confirmation.
Is the Airtac JSI Series Standard Cylinder JSI40X1200S the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm JSI drops the 0.5 MPa push force to 402 N, while moving up to a 50 mm bore increases it to 982 N. If your machine layout loses air or the valve is centered, the piston will drift and drop the load—the adjustable air cushion only decelerates the stroke end and never acts as a lock, so fit an external rod lock or pilot-operated check valve for secure holding.
At 1200 mm, this long stroke demands careful mounting to prevent rod bending under side loads. Always use an external guide rail to support the payload and avoid binding, and ensure your chosen LB foot, FA flange, or TC trunnion bracket accommodates the extended length.
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 JSI40X1200S FAQ
This 40 mm bore cylinder features a G1/4 port and generates 628 N push / 528 N pull at 0.5 MPa, and 879 N push / 739 N pull at 0.7 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
The JSI is a JIS-standard cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. It uses an extruded hard-anodized aluminum barrel with no external rods, saving space without sacrificing the 1200 mm stroke.
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