Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S
The AirTAC SAIJ125X950-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and features a 950mm nominal stroke that can be fine-tuned backward by up to 50mm, yielding a precise 900-950mm usable travel window. This built-in adjustability allows operators to dial in exact end positions during commissioning without adding external stops.
This model includes a magnetic piston for position detection via AirTAC CMSE reed or DMSE electronic sensors. The extruded aluminum barrel integrates sensor grooves on both sides, and the carbon steel rod with an M27x2 thread handles heavy loads. The rear screw acts purely as a travel stop and does not hold the load without live air pressure; for load-holding requirements, consider the SAIL or BSAI variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
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 SAIJ125 Adjustable Cylinder SAIJ125X950-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S Is Used
Product Changeovers
Dial in the 900-950mm travel window during format changes on packaging lines, avoiding the need to physically swap cylinders for different product sizes.
Heavy-Duty Positioning
Leverage the 6136N push force to move heavy pallets or fixtures, using the rear stopper to fine-tune the exact retracted end position at commissioning.
Automated Assembly
Use the magnetic piston with DMSE electronic sensors to confirm stroke endpoints, while the 50mm adjustment range absorbs minor mechanical tolerances in long-stroke assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N thrust at 0.5 MPa (or 8590N at 0.7 MPa) alongside variable end-stop positioning. If you need less force, stepping down to an 80mm bore yields 2513N push force, whereas moving up to a 160mm bore provides 10053N. The adjustable 900-950mm window is ideal for product-size changeovers on a line, replacing the need to physically swap out a fixed-stroke SAI cylinder.
Because the 950mm stroke is substantial, an external guide is strongly recommended to prevent excessive side-loading on the M27x2 piston rod. This SKU is dimensionally interchangeable per ISO 15552 and uses a PT tapered port. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. Note that the rear adjuster and air cushions decelerate the load but do not function as a lock.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ 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 Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590N.
The rear adjuster screw allows you to shorten the 950mm nominal stroke by up to 50mm, creating a 900-950mm usable travel window. This stopper sets the end position but does not lock the load without continuous air pressure.
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