Airtac JSI Series Standard Cylinder JSI125X280
The AirTAC Airtac JSI Series Standard Cylinder JSI125X280 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 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 JSI125X280
Delivering massive thrust for heavy machinery, the AirTAC JSI125X280 pushes with 6136 N and pulls with 5734 N at 0.5 MPa. This double-acting JIS-standard actuator uses an extruded hard-anodized aluminum barrel without external rods, making it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore to save valuable machine space. Its heterogeneous two-way piston seal retains grease for a long, low-friction service life.
For real-world sizing, plan for about 3682 N of actual work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin. The cylinder features a 32 mm carbon steel rod, an M27x2.0 rod-end thread, and a G1/2 air port. Because this specific SKU lacks the -S magnet option, it cannot accept CMSE or DMSE position switches; you would need the -S variant for sensor grooves.
Airtac JSI Series Standard Cylinder JSI125X280 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X280 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 JSI125X280
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×280 | 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 JSI125X280 Is Used
Stamping Press Feed
Pushes heavy coil stock into a mechanical stamping press using 6136 N of thrust at 0.5 MPa.
Injection Mold Clamp
Secures large injection molding tooling halves with a 313 kg safe vertical lifting capacity.
Pallet Stopper Gate
Acts as a heavy-duty 280 mm stroke stopper gate for loaded pallets on high-capacity conveyor lines.
Is the Airtac JSI Series Standard Cylinder JSI125X280 the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm JSI offering 3927 N push at 0.5 MPa, while there is no larger standard JSI bore above 125 mm. The 280 mm stroke is well within the 1500 mm maximum standard limit and operates at 30-500 mm/s. Since the stroke is under 300 mm, severe side-load rod bending is less critical, but you should still guide heavy loads to prevent binding.
Remember that a standard cylinder drifts when air is lost or the valve is centered, as the adjustable 33 mm air cushions only decelerate the piston near stroke ends rather than locking it. To hold a suspended load securely, install an external rod lock or a pilot-operated check valve. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or an I/Y/F/U rod knuckle.
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 JSI125X280 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. This 125 mm bore cylinder uses a G1/2 air port, a 32 mm rod, and an M27x2.0 rod thread.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore, saving footprint. It features an extruded aluminum barrel without external rods. Note this SKU has no -S magnet, so it cannot use CMSE or DMSE sensors.
Authorized Export Seller
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.
Related AirTAC JSI Cylinders
Request a Quote for Airtac JSI Series Standard Cylinder JSI125X280
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.