Airtac JSI Series Standard Cylinder JSI125X30S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X30S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 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 JSI125X30S
Delivering massive thrust in a tight footprint, this double-acting 125 mm bore JIS-standard profile cylinder is explicitly shorter and more compact than an equivalent ISO 15552 unit of the same bore. The extruded hard-anodized aluminum barrel sheds external rods to resist wear, while the heterogeneous two-way piston seal retains grease for a long, low-friction service life. Equipped with a G1/2 port, an M27x2.0 rod thread, and a built-in magnet, it pushes with 6136 N and pulls with 5734 N at 0.5 MPa.
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. Because this SKU includes the S magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side sensor grooves for position detection. The adjustable 33 mm air cushions at both ends decelerate the piston smoothly near the stroke ends, operating reliably between 30-500 mm/s.
Airtac JSI Series Standard Cylinder JSI125X30S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X30S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 JSI125X30S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×30 | 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 JSI125X30S Is Used
Injection Mold Clamping
Uses the 6136 N push force to secure heavy injection mold halves within confined machinery frames where overall cylinder length is restricted.
Pallet Stopper Gate
Acts as a high-force physical stop barrier on heavy-duty pallet conveyors, extending 30 mm to halt loads moving at low speeds.
Lift Truck Fork Positioner
Provides the raw push and pull strength required to hydraulically adjust the spacing on heavy forklift forks in high-capacity warehousing.
Is the Airtac JSI Series Standard Cylinder JSI125X30S the Right Cylinder?
When sizing this unit, the 100 mm bore is the step down—offering 3927 N push at 0.5 MPa—while the 125 mm stands as the largest available JSI bore, delivering the full 6136 N push at 0.5 MPa. The integrated S magnet perfectly matches CMSE and DMSE sensors for automated feedback. Keep in mind that a standard cylinder will drift if air pressure drops or the valve is centered; the cushions only slow the piston near stroke end and do not function as a brake. To suspend a load safely during an outage, 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 JSI125X30S FAQ
This 125 mm bore cylinder features a G1/2 port and an M27x2.0 rod thread. The thrust output is 6136 N push and 5734 N pull at 0.5 MPa, increasing to 8590 N push and 8028 N pull at 0.7 MPa. The theoretical maximum force at 1.0 MPa is 1251 kgf.
The JSI is a JIS-standard profile cylinder that is explicitly shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. It achieves this by using an extruded hard-anodized aluminum barrel without external rods, saving valuable machine space while retaining full thrust capacity.
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