Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-75
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-75 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 JSIJ125X250-75
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder brings heavy-duty actuation into a footprint noticeably shorter than a same-bore ISO 15552 unit. The hard-anodized aluminium barrel keeps the assembly light, and the G1/2 port handles the high air volume this size demands. It handles about 3682 N of real work safely, which translates to lifting roughly 313 kg vertically with a 2:1 margin.
The -75 code means an external stop screw lets you trim the extend stroke on-site by up to 75 mm, dropping the usable extension from the 250 mm maximum down to 175 mm without swapping the cylinder. The retract end remains fixed. Because this SKU lacks the -S magnet, it cannot take a CMSE or DMSE sensor. Note that the adjustable cushion only decelerates the piston near the ends; for locked load holding on air loss you must add an external rod lock or pilot-operated check valve.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-75 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-75 |
|---|---|
| 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 JSIJ125X250-75
| 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 JSIJ125X250-75 Is Used
Heavy Pallet Lift
Drives a 250 mm vertical lift for loaded pallets, using the 75 mm adjuster to dial in the exact raise height for different fixture clearances.
Press Tonnage Trim
Provides 6136 N of clamping force on an assembly press, with the stop screw shortening the extend stroke to avoid over-travel on softer parts.
Stamping Pin Set
Actuates a heavy stamping pin set where the 175 to 250 mm extend window lets operators set precise striking depth without changing tooling.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X250-75 the Right Cylinder?
When sizing this 125 mm bore, dropping to the 100 mm bore cuts the 0.5 MPa push force to 3927 N, while this unit provides 6136 N push and 5734 N pull at the same pressure. The external adjuster is ideal when you need to fine-tune the extend end position on-site or want a single spare that covers 175 to 250 mm strokes. Mounting options include FA, LB, TC, TCM1, and TCM2. Since this is a no-S SKU, magnetic sensing is not supported. For any stroke at or above 300 mm, always guide the load to prevent side-load damage to the front cover.
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 JSIJ125X250-75 FAQ
This 125 mm bore cylinder uses a G1/2 port and a 32 mm rod. It generates 6136 N push and 5734 N pull at 0.5 MPa, rising to 8590 N push and 8028 N pull at 0.7 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
The nominal 250 mm stroke is the maximum. An external stop screw lets you shorten the extend stroke on-site by up to 75 mm, giving a usable extension range of 175 to 250 mm. The retract end is fixed, and this stop only sets the end position rather than locking the load.
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