Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50 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
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50
The AirTAC SAIJ125X280-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 280 mm stroke that can be dialed back by up to 50 mm, yielding a highly versatile 230-280 mm usable travel window for precise end-position tuning during commissioning. Delivering 6136 N of pull force at 0.5 MPa, it is engineered for heavy-duty positioning.
This model features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance in demanding environments. It operates at speeds of 30-500 mm/s and incorporates variable air cushions at both ends to decelerate moving loads. The rear stopper mechanism acts solely as a travel limit and does not hold the load without live air pressure; for true position holding, a SAIL or BSAI lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50 |
|---|---|
| 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 SAIJ125AX280-50
| 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 SAIJ125AX280-50 Is Used
Product Size Changeovers
Dial in the 230-280 mm travel window during line format changes to accommodate varying package lengths without replacing the actuator.
End-Position Tuning
Fine-tune the retract stroke at machine commissioning to dial out mechanical tolerance drift and achieve exact positioning.
Heavy-Duty Forming
Leverage the 6136 N pull force at 0.5 MPa for pressing or forming stations that require adjustable travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application demands high thrust combined with variable end-stop positioning. If 5734 N of pull force at 0.5 MPa is excessive, stepping down to a 100 mm bore yields 3681 N, whereas moving up to a 160 mm bore provides 9425 N. The integrated 50 mm adjustment mechanism is ideal for product-size changeovers on a production line, eliminating the need to physically swap cylinders or bolt on external stops.
When specifying a replacement, verify the 280 mm nominal stroke, 50 mm adjustment range, PT tapered port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the total stroke is 280 mm, external guiding is recommended to prevent rod side-loading. Note that this SKU lacks a magnet; adding an -S suffix enables CMSE reed or DMSE solid-state sensors in the dual-sided barrel grooves.
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 SAIJ125AX280-50 FAQ
At a standard 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 6136 N of push force. If the pressure is increased to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this SAIJ125X280-50, the 280 mm nominal stroke can be trimmed back by up to 50 mm, creating a 230-280 mm usable travel window. The adjuster only sets the end position and does not lock the load without continuous air pressure.
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