Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-30 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 SAIJ125BX280-30
The AirTAC SAIJ125X280-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, delivering a robust 6136N pull force at 0.5 MPa. By turning the rear stopper screw, technicians can fine-tune the effective travel window down from the 280mm nominal stroke to a minimum of 250mm, dialing in exact end positions without swapping out the unit. This adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Built with a SUS304 stainless steel rod (option B) for superior corrosion resistance, this 125mm bore model uses PT tapered G1/2 ports and operates at speeds of 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of position switches, while the adjustable nature makes it ideal for production lines running varying product sizes.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-30 |
|---|---|
| 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 SAIJ125BX280-30
| 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 SAIJ125BX280-30 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 250-280mm window for sensors or clamps that need frequent mechanical recalibration.
Product Size Changeovers
Quickly adapt machinery to different package dimensions on a packaging line by adjusting the rear stopper screw rather than replacing the entire cylinder.
High-Force Assembly Pressing
Leverage the 6136N pull force for heavy-duty pressing and joining operations, using the stroke adjustment to fine-tune the pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-30 the Right Cylinder?
Choose this 125mm bore cylinder when your process demands high thrust—stepping down to a 100mm bore drops the 0.5MPa push force to 3927N, whereas this SAIJ125X280-30 provides 6136N. The 30mm adjustment window is perfect for applications requiring variable end-stops during product changeovers, offering more setup flexibility than a fixed-stroke SAI cylinder. Because the rear adjuster is a stop and not a lock, applications needing true load-holding without live air should consider the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 280mm stroke, 30mm adjustment range, PT G1/2 port, and desired mounting accessory. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets, omitting FB, CA, CB, and CR options. For any stroke of 280mm or more, external guide rails are recommended to prevent excessive side-loading on the rod.
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 SAIJ125BX280-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can deliver up to 11045N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the 280mm nominal stroke down to 250mm. This creates a 30mm adjustable window for fine-tuning the end position at commissioning without adding external stops.
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