Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 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 SAIJ125BX280-20S
The AirTAC SAIJ125X280-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 280mm nominal stroke that can be fine-tuned down by 20mm, providing a usable travel window between 260mm and 280mm. This built-in adjustability allows operators to dial in exact retract end positions during commissioning without swapping out the entire unit.
Configured with a SUS304 stainless steel rod and a PT tapered port, this model includes a magnet for position sensing. It supports AirTAC CMSE reed and DMSE electronic solid-state switches mounted into the sensor grooves on both sides of the extruded aluminum barrel. The rear stopper solely sets the travel limit and relies on the integrated air cushions for end-of-stroke deceleration; it does not function as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125BX280-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125BX280-20S Is Used
Product Size Changeovers
Quickly adapt machinery for different product lengths by dialing the retract position back 20mm, avoiding mechanical rebuilds on the assembly line.
Commissioning Calibration
Fine-tune the 260-280mm travel window during initial machine setup to achieve perfect alignment without adding external stopper blocks.
Heavy-Duty Positioning
Leverage the 6136N push force to move heavy pallets or fixtures, using the adjustable end-stop to account for minor mechanical variances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-20S the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust, such as 6136N push or 5734N pull at 0.5 MPa, but still needs precise end-position tuning. If your setup demands less force, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. The adjustable stroke is specifically beneficial for machine changeovers or varying product sizes, negating the need to bolt on external stops or buy a fixed-stroke SAI cylinder.
Because the 280mm stroke exceeds 300mm is not the case here, but for any extended travel, ensuring adequate external guidance is recommended to manage side loads. Remember that the SAIJ rear adjuster acts purely as a travel stop and cannot hold a load without continuous air pressure; for true load-holding, consider the SAIL or BSAI series. As a dimensionally interchangeable ISO 15552 cylinder, replacement requires matching the 125mm bore, 280mm stroke, 20mm adjuster, PT port, and the -S magnet.
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 SAIJ125BX280-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 280mm nominal stroke by up to 20mm, creating a usable travel window of 260-280mm. This stopper sets the end position but does not lock the load without live air pressure.
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