Airtac JSI Series Standard Cylinder JSI125X1550S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X1550S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 1550mm stroke, G1/2 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.
- BoreØ125 mm
- Stroke1550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- CushionAdjustable, 33 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 JSI125X1550S
Delivering massive thrust in a compact footprint, the AirTAC JSI125X1550S is a double-acting JIS-standard profile cylinder that is physically shorter than an ISO 15552 unit of the same 125mm bore. It generates 6136N of push force and 5734N of pull force at 0.5MPa, peaking at an 8590N push at 0.7MPa. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while a two-way piston seal retains grease for a long, low-friction service life. Because this is a made-to-order 1550mm stroke exceeding the 1500mm standard maximum, expect extended lead times.
For practical sizing, plan for about 3682N of real work at 0.5MPa, which safely lifts roughly 313kg vertically with a 2:1 margin. The -S suffix means a piston magnet is built in, allowing CMSE or DMSE electronic switches to drop directly into the side grooves for position sensing. Air enters via a G1/2 port, and adjustable 33mm air cushions at both ends decelerate the heavy piston smoothly. The cylinder operates at 30-500mm/s across a 0.15-1.0MPa pressure range.
Airtac JSI Series Standard Cylinder JSI125X1550S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X1550S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 1550 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 33 mm |
| Max standard stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 JSI125X1550S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×1550 | 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 JSI125X1550S Is Used
Heavy Press Stamping
Drives large stamping dies and heavy metal-forming presses where 6136N of thrust at 0.5MPa is required to shape thick steel plate.
Injection Mold Ejection
Ejects large molded plastic parts from heavy injection machinery, using the 1550mm stroke to clear deep mold cavities safely.
Pallet Transfer Unit
Shifts fully loaded pallets along high-capacity conveyor lines, benefiting from the compact JIS profile to fit tight transfer stations.
Is the Airtac JSI Series Standard Cylinder JSI125X1550S the Right Cylinder?
When sizing this bore class, stepping down to the 100mm bore drops the 0.5MPa push force to 3927N, while there is no larger JSI frame above 125mm. Because this 1550mm stroke exceeds the 1500mm standard maximum, it is a non-standard made-to-order configuration; always specify external guide rails to prevent rod bending under heavy side loads over such a long extension. The standard JSI does not hold its load if air pressure drops or the valve is centered, as the piston will drift and the cushions only decelerate near stroke end. For suspended or vertical loads, install an external rod lock or a pilot-operated check valve. The -S magnet on this unit is fully compatible with CMSE and DMSE sensors.
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 JSI125X1550S FAQ
This 125mm bore cylinder provides 6136N push and 5734N pull at 0.5MPa, 8590N push and 8028N pull at 0.7MPa, with a theoretical maximum of 1251kgf at 1.0MPa. It features a G1/2 port, an M27x2.0 rod thread, 33mm adjustable air cushions, and operates at 30-500mm/s. The 1550mm stroke is a non-standard made-to-order length.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125mm bore, saving valuable machine space. It uses an extruded aluminum barrel without external rods, and the built-in -S magnet allows CMSE or DMSE sensors to track position directly.
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