Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S 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
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S
The AirTAC SAIJ125X280-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a substantial 8590N push force at 0.7 MPa, utilizing a 32mm carbon steel rod with an M27x2 thread to manage high side loads effectively. The integrated -S magnet supports position sensing via CMSE reed or DMSE electronic switches fitted into the dual-side sensor grooves.
This model provides a 260-280mm usable travel window, allowing you to dial back the 280mm nominal stroke by up to 20mm during commissioning. The external rear stopper acts purely as a travel end-stop for fine-tuning product changeovers, not as a load-holding lock; for dead-stop security without live air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S |
|---|---|
| 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 SAIJ125X280-20S
| 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 SAIJ125X280-20S Is Used
Product Changeover Tuning
Dial in the exact 260-280mm end-stop during machine setup to accommodate different material lengths without changing the cylinder.
Heavy Press Positioning
Leverage the 8590N force at 0.7 MPa to shift heavy assemblies into final position, using the rear adjuster to prevent overtravel.
Variable End-Stop Machining
Fine-tune the retraction point on the fly for multi-stage machining lines where precise end-positioning is critical.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-20S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 5497N push at 0.7 MPa) lacks the thrust for heavy positioning tasks. The SAIJ125X280-20-S is selected over a fixed SAI when a machine requires variable end-stops for different product sizes without swapping the barrel. It features a PT tapered G1/2 port, a 40mm cushion stroke, and operates at 30-500 mm/s.
Dimensionally interchangeable per ISO 15552, this cylinder uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. Because the stroke exceeds 300mm in larger variants, always support long unsupported loads with an external guide to prevent rod binding, even with the robust 32mm 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 SAIJ125X280-20S FAQ
At 0.7 MPa, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can reach a maximum push of 11045N at 0.9 MPa.
The rear adjuster allows you to shorten the 280mm nominal stroke by up to 20mm, creating a 260-280mm usable travel window. It functions as a mechanical stop for end-position tuning and does not hold the load without live air pressure.
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