Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40 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 SAIJ125AX280-40
The AirTAC SAIJ125X280-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 240-280 mm usable travel window from its 280 mm nominal stroke. It delivers 6136 N of push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration omits the magnet.
This variant utilizes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. The rear adjuster acts strictly as a mechanical stop to fine-tune the retract end-position during commissioning; it does not lock or hold the load without continuous air pressure. For applications requiring position holding without live air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40 |
|---|---|
| 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 SAIJ125AX280-40
| 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 SAIJ125AX280-40 Is Used
Machine Changeover
Dial in the 240-280 mm travel window during product size changes without replacing the cylinder or adding external stop blocks.
End-Position Tuning
Fine-tune the retract end position at commissioning using the rear adjuster to perfectly align heavy 6136 N loads.
Heavy-Duty Positioning
Leverage the robust 125 mm bore and SUS420J2 stainless rod for demanding industrial positioning tasks requiring precise travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-40 the Right Cylinder?
Select this 125 mm bore cylinder when an application demands high thrust combined with variable end-stops, stepping up from a 100 mm bore that provides 3927 N at 0.5 MPa. The 40 mm adjustment range is ideal for product changeovers on a line, allowing operators to dial in the exact 240-280 mm travel without swapping out the entire cylinder or fabricating external stop blocks. If the load-holding is required, an external rod lock or pilot-operated check valve is necessary since the SAIJ adjuster is only a travel stop.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 280 mm stroke, 40 mm adjustment, PT G1/2 port, and the specific mounting interface. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the stroke is 280 mm, ensure proper guiding 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 SAIJ125AX280-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjusting screw allows you to shorten the effective stroke by up to 40 mm, providing a usable travel window of 240 to 280 mm. This mechanical stop fine-tunes the end position but does not hold the load without live air pressure.
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