Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S is a genuine double acting, adjustable stroke 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, adjustable stroke
- 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S
Delivering 6136 N of push force at 0.5 MPa, this large-bore JIS profile cylinder brings heavy-duty actuation into a footprint noticeably shorter than a same-bore ISO 15552 unit. The hard-anodized aluminum extruded barrel keeps weight down while handling up to 1.0 MPa. It feeds through a G1/2 port and decelerates smoothly via 33 mm adjustable air cushions at both ends.
The -50 code means an external stop screw lets you shorten the extend stroke on-site by up to 50 mm, dropping the usable forward travel from the 300 mm maximum down to 250 mm without swapping the cylinder. This on-site tuning is ideal for dialing in exact end positions. Factoring in a 60 percent safety margin, it handles about 3682 N of real work, which translates to lifting roughly 313 kg vertically. The -S suffix adds a piston magnet for CMSE/DMSE sensors in the side grooves.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 mm |
| Acting type | Double acting, adjustable stroke |
| 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S
| JSIJ | JIS-standard profile cylinder (adjustable-stroke 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S Is Used
Heavy Pallet Forming
Presses heavy pallets with 6136 N at 0.5 MPa, using the 50 mm adjuster to fine-tune the crush height for different wood thicknesses on-site.
Stamping Press Feed
Cycles a heavy blank into a press, relying on the 33 mm cushions to stop the 125 mm piston smoothly before the external guide absorbs any side loads.
Bulk Bin Gating
Opens large aggregate bins where the 300 mm travel retracts the gate fully, and the -S magnet tracks the valve position for the PLC.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S the Right Cylinder?
At the top of the range, this 125 mm bore pushes 6136 N and pulls 5734 N at 0.5 MPa; if that exceeds your needs, stepping down to the 100 mm bore drops the push force to 3927 N. Going larger is not an option here. The 50 mm adjustable window is perfect for sharing one spare cylinder across several stroke variants or fine-tuning a machine setup. Mounting options include FA, LB, TC, TCM1, and TCM2. Because the 300 mm stroke creates leverage, always use an external guide to prevent rod bending and side loads. Remember the stop screw sets position only; use an external rod lock or pilot-operated check valve if you need to hold a load on air loss.
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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-50S FAQ
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa it pushes 8590 N and pulls 8028 N. The theoretical max force is 1251 kgf at 1.0 MPa. It uses a G1/2 port, a 32 mm rod, and an M27x2.0 rod thread.
The 300 mm nominal stroke is the maximum. The external stop screw lets you shorten the extend stroke by up to 50 mm on-site, giving a usable forward travel of 250 to 300 mm. The retract end is fixed. This mechanism only sets the end position; it does not lock the load.
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1-Year Warranty
Covers non-human-caused product damage.
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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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