Airtac SAIJ125 Adjustable Cylinder SAIJ125BX950-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX950-20 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
- 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 SAIJ125 Adjustable Cylinder SAIJ125BX950-20
The AirTAC SAIJ125X950-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 950 mm nominal travel by up to 20 mm. This yields a usable end-position window of 930-950 mm, enabling precise tuning at commissioning without swapping hardware. It delivers substantial thrust, pushing 8590 N at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and ships with PT tapered port threads. Because the stroke extends to 950 mm, the 32 mm rod diameter should be paired with an external guide to prevent excessive side-loading. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX950-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX950-20 |
|---|---|
| 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 SAIJ125BX950-20
| 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 SAIJ125BX950-20 Is Used
Product Changeover
Quickly modify the 930-950 mm travel end-stop during packaging line size changeovers without replacing the entire cylinder assembly.
Heavy Press Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy assemblies, using the rear adjuster to dial in the exact final position during setup.
Commissioning Calibration
Fine-tune the end-of-stroke position on long-stroke machinery during initial commissioning to avoid costly mechanical hard-stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX950-20 the Right Cylinder?
Select this 125 mm bore when an application requires heavy thrust that exceeds the 5497 N push force of a 100 mm cylinder at 0.7 MPa, but does not demand the massive 14074 N output of a 160 mm unit. The adjustable stroke is ideal for product changeovers on a line, allowing operators to fine-tune the 930-950 mm travel window on the fly instead of machining external stop blocks.
When integrating this actuator, note that the rear screw sets the travel end but provides no locking force; for load-holding without live air, consider an external rod lock or the AirTAC SAIL series. To match this ISO 15552 cylinder exactly, specify a 125 mm bore, 950 mm stroke, 20 mm adjustment, PT port thread, SUS304 rod material, and standard mounting options (Basic, FA, LB, TC, FTC, TCM1, TCM2). Given the 950 mm stroke, always support the load with an external guide to protect the rod from side-load damage.
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 SAIJ125BX950-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a 930-950 mm usable travel window. It acts as a mechanical stop to fine-tune the end position and does not lock the load without continuous air pressure.
At 0.7 MPa operating pressure, the SAIJ125X950-20 provides 8590 N of push force and 5734 N of pull force. At a maximum 1.0 MPa, it can deliver up to 1251 kgf.
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