Airtac JSI Series Standard Cylinder JSI125X1200S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X1200S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 1200mm 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
- Stroke1200 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 JSI125X1200S
Delivering massive thrust for heavy machinery, the AirTAC JSI125X1200S pushes with 6136 N and pulls with 5734 N at 0.5 MPa. This double-acting JIS-standard profile cylinder uses an extruded hard-anodized aluminum barrel, making it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore to save valuable machine space.
The built-in -S piston magnet lets CMSE or DMSE sensors drop directly into the side grooves for precise end-position detection. A heterogeneous two-way seal retains grease for low-friction life. Plan for about 3682 N of real work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin. Pneumatic connections use a G1/2 port, and the unit operates at 30-500 mm/s.
Airtac JSI Series Standard Cylinder JSI125X1200S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X1200S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 1200 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 JSI125X1200S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | 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 JSI125X1200S Is Used
Injection Mold Clamping
Provides the 6136 N push force needed to secure heavy injection molding halves over the 1200 mm opening stroke.
Palletizer Elevation
Lifts loaded pallets weighing up to 313 kg vertically, relying on external guides to handle the long 1200 mm travel.
Press Ejection System
Ejects dense metal castings from hydraulic presses using the 5734 N pull force at 0.5 MPa.
Is the Airtac JSI Series Standard Cylinder JSI125X1200S the Right Cylinder?
When sizing this 125 mm bore, stepping down to a 100 mm bore drops the push force to 3927 N at 0.5 MPa, while 125 mm is the largest available JSI option. Because this unit lacks an internal locking mechanism, the piston will drift if air is lost or the valve is centered; use an external rod lock or pilot-operated check valve to hold suspended loads safely. The 33 mm adjustable air cushions only decelerate the piston near the stroke ends.
At 1200 mm of travel, the 32 mm rod is highly susceptible to bending under lateral stress. Mount external guide rails to absorb side loads and prevent rod damage. The -S magnet matches perfectly with CMSE or DMSE switches for position feedback.
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 JSI125X1200S FAQ
At 0.5 MPa it pushes with 6136 N and pulls with 5734 N. At 0.7 MPa it pushes 8590 N and pulls 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. The air port is G1/2, the rod thread is M27x2.0, and speed ranges from 30-500 mm/s.
It is strictly a JIS-standard cylinder, but its extruded hard-anodized aluminum barrel makes it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The -S magnet allows CMSE or DMSE sensors to fit directly into the side grooves.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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