Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-40
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-40 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 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 JSIJ125X250-40
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder handles about 3682 N of real work, roughly 313 kg lifted vertically with a 2:1 margin. The hard-anodized aluminum barrel makes it shorter and more compact than a same-bore ISO 15552 unit. It uses a G1/2 port and an M27x2.0 rod thread.
The external stop screw lets you shorten the extend stroke on site by up to 40 mm, giving a usable extend range of 210-250 mm without changing the cylinder itself. The retract end remains fixed. This SKU has no magnet and cannot take a sensor; add the -S variant for CMSE/DMSE switches. The 33 mm adjustable air cushions only decelerate the piston near stroke end, so fit an external rod lock or pilot-operated check valve if you need to hold a load on air loss.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-40 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-40 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 JSIJ125X250-40
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×250 | 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 JSIJ125X250-40 Is Used
Heavy Pallet Forming
Supplies the 8590 N push at 0.7 MPa needed to compact heavy pallets, with the 40 mm window allowing exact top-position tuning on the line.
Large Valve Actuation
Drives large-bore process valves where the 250 mm nominal stroke can be dialed back 40 mm to hit the exact closed seat without mechanical spacers.
Bulk Goods Diverting
Handles heavy diverting arms on high-capacity conveyors, using the compact JIS profile to save machine space while pushing up to 1251 kgf at 1.0 MPa.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-40 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, the 100 mm bore offers 3927 N push. The adjustable 40 mm window is ideal for tuning end positions on site or sharing a spare across stroke variants. Mounting options include Basic, FA, LB, TC, TCM1 and TCM2. Because this is a non-magnet SKU, you cannot fit CMSE/DMSE sensors. For any stroke of 300 mm or more, always use a guide rail to prevent side-load damage.
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 JSIJ125X250-40 FAQ
It delivers 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 max of 1251 kgf at 1.0 MPa. It has a 32 mm rod, M27x2.0 rod thread, G1/2 port, 33 mm cushions, and operates at 30-500 mm/s.
The -40 code means an external stop screw lets you shorten the extend stroke by up to 40 mm on site. The usable extend range is 210-250 mm, with 250 mm being the maximum. The retract end is fixed, and the stop only sets the end position, acting as a cushion rather than a load lock.
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 JSIJ100~125 Adjustable Cylinder JSIJ125X250-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.