Airtac JSI Series Standard Cylinder JSI125X275
The AirTAC Airtac JSI Series Standard Cylinder JSI125X275 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 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 JSI125X275
Delivering massive thrust for heavy machinery, the AirTAC JSI125X275 generates 6136 N of push force and 5734 N of pull at 0.5 MPa. Built to JIS standards, this double-acting actuator features an extruded hard-anodized aluminum barrel that is notably shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The G1/2 port feeds a robust 32 mm piston rod, while a heterogeneous two-way seal retains grease for low-friction longevity.
Because this specific SKU lacks the -S magnet, it cannot host CMSE or DMSE position sensors. For sizing, plan for roughly 3682 N of actual work at 0.5 MPa, which translates to lifting about 313 kg vertically with a 2:1 safety margin. If your cycle requires end-of-stroke sensing, select the JSI125X275-S variant instead.
Airtac JSI Series Standard Cylinder JSI125X275 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X275 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 JSI125X275
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×275 | 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 JSI125X275 Is Used
Heavy Stamping Presses
Provides the intense 6136 N push force required to actuate large metal forming and stamping dies.
Injection Molding Ejectors
Knocks out heavy molded plastic parts from large industrial injection machines using reliable 5734 N pull.
Pallet Lift Gates
Raises and lowers loaded industrial pallet gates, easily handling the 313 kg vertical lift capacity safely.
Is the Airtac JSI Series Standard Cylinder JSI125X275 the Right Cylinder?
When sizing this 125 mm bore, compare it against the adjacent JSI100 (3927 N push @0.5 MPa) for lighter loads, or the JSI125 itself if you need the maximum 1251 kgf theoretical limit at 1.0 MPa. This 275 mm stroke falls well under the 1500 mm standard maximum, keeping the assembly rigid. However, for any application exceeding 300 mm, always support the load with external guides to prevent rod bending and premature seal wear. Note that a standard cylinder drifts when air is lost; add an external rod lock or pilot-operated check valve if the load must be held.
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 JSI125X275 FAQ
This model delivers 6136 N push and 5734 N pull at 0.5 MPa, or 8590 N push and 8028 N pull at 0.7 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa. It uses a G1/2 air port and operates at 30-500 mm/s.
No, because this specific SKU does not include the -S magnet, it cannot accept CMSE or DMSE switches. You must choose the -S variant to utilize the built-in sensor grooves for position detection.
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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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