Airtac JSI Series Standard Cylinder JSI125X300SCA
The AirTAC Airtac JSI Series Standard Cylinder JSI125X300SCA is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 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 JSI125X300SCA
Delivering massive thrust in a compact footprint, this double-acting 125mm bore JIS-standard profile cylinder is notably shorter than an equivalent ISO 15552 unit of the same bore. It pushes with 6136 N and pulls with 5734 N at 0.5 MPa, scaling up to 8590 N push at 0.7 MPa. The extruded hard-anodized aluminum barrel eliminates external rods to resist wear, while the two-way piston seal retains grease for long, low-friction life.
Because the SKU includes the -S suffix, a built-in piston magnet enables CMSE or DMSE switches to drop directly into the side grooves for position sensing. The G1/2 air port and M27x2.0 rod thread handle high flow and heavy loads. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which lifts roughly 313 kg vertically with a 2:1 safety margin.
Airtac JSI Series Standard Cylinder JSI125X300SCA Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X300SCA |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 JSI125X300SCA
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×300 | 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 JSI125X300SCA Is Used
Heavy Press Ejection
Uses the 8590 N push force at 0.7 MPa to eject dense stamped metal parts from a hydraulic press bed.
Pallet Stopper Gate
Leverages the 313 kg vertical lift capacity to raise and lower heavy payload stopper gates on conveyor lines.
Injection Mold Clamping
Secures large mold halves during low-pressure clamping, utilizing the robust 32mm piston rod and CA clevis.
Is the Airtac JSI Series Standard Cylinder JSI125X300SCA the Right Cylinder?
When sizing this 125mm bore unit, the next size down is the 100mm bore (offering 3927 N push at 0.5 MPa), while there is no larger standard JSI bore above it. The included CA clevis mounting accessory is ideal for pivoting loads, and the -S magnet pairs seamlessly with DMSE electronic sensors. Operating speed spans 30-500 mm/s.
Because this model features a 300mm stroke, external guide rails should be used to prevent rod bending and absorb side loads. Note that a standard cylinder drifts when air is lost or the valve is centered; the end cushions only decelerate the piston near stroke end. To suspend a load safely, install an external rod lock or a pilot-operated check valve.
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 JSI125X300SCA FAQ
This 125mm bore cylinder features a G1/2 air port and an M27x2.0 rod thread. The thrust ratings are 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The extruded aluminum profile body is shorter and more compact than an ISO 15552 cylinder of the same bore, saving machine space. It cannot hold a load if air pressure drops; the cushions only decelerate the piston at stroke end. Use a pilot-operated check valve for vertical load holding.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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