Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75
The AirTAC SAIJ125X350-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By integrating an external adjusting screw at the rear, this model allows you to dial back the nominal 350mm stroke by up to 75mm, creating a precise 275-350mm usable travel window. This built-in adjustability eliminates the need to swap out the entire cylinder or fabricate external stops when fine-tuning end positions during commissioning.
Featuring a sizable 32mm carbon steel piston rod and an M27x2 rod thread, this bore size is built to handle substantial loads while offering excellent resistance to side-loading stresses. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of position switches, though this specific configuration omits the internal magnet. It is important to note that the rear adjuster functions strictly as a travel stop to set deceleration endpoints and does not hold the load without live air pressure; for true load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125X350-75 Is Used
Machine Setup & Changeover
Fine-tune the 275-350mm travel window during initial commissioning or product size changeovers without swapping cylinders or adding external mechanical stops.
Variable End-Stop Positioning
Dial in the exact retract end-position for multi-format production lines, utilizing the 75mm rear adjustment screw to adapt to varying workpiece dimensions on the fly.
Heavy-Duty Forming Operations
Leverage the 6136N thrust at 0.5 MPa for pressing or forming applications where the exact end-of-stroke position must be precisely bounded by a mechanical stop.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-75 the Right Cylinder?
Choose this adjustable-stroke variant over a fixed SAI model when your application requires frequent product changeovers or variable end-stop positioning without mechanical rework. If your thrust requirements are lower, stepping down to an 80mm bore yields 2513N of push force at 0.5 MPa, significantly reducing air consumption and physical footprint. Because this SKU features a 350mm stroke, it is critical to provide an external guide to support the rod and prevent excessive side-loading on the seal over extended travels.
When replacing an ISO 15552 cylinder, verify the exact 125mm bore, 350mm nominal stroke, 75mm adjustment requirement, PT tapered G1/2 port, and mounting style. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Operating speed is rated for 30-500mm/s, and pneumatic cushions are present at both ends to manage kinetic energy.
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 SAIJ125X350-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjusting screw acts as a mechanical stop that can shorten the 350mm nominal stroke by up to 75mm, providing a usable travel window of 275-350mm. This stop sets the travel end and must not be relied upon to hold a load without continuous air pressure.
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