Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75 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 SAIJ125AX350-75
The AirTAC SAIJ125X350-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 350mm stroke with an adjustable travel window of 275 to 350mm, allowing you to dial back the retract position by up to 75mm during commissioning. This bore delivers 6136N of pull force at 0.5MPa and includes a SUS420J2 stainless steel rod for improved corrosion resistance.
Equipped with a PT tapered G1/2 port, this model operates at speeds of 30-500mm/s. The rear adjuster acts purely as a mechanical stop to set the end position; it does not hold the load without live air pressure. For true load-holding requirements without continuous air supply, consider the SAIL or BSAI cylinder series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75 |
|---|---|
| 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 SAIJ125AX350-75
| 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 SAIJ125AX350-75 Is Used
Variable End-Stop Forming
Fine-tune the 275-350mm retract position on the fly to accommodate different material lengths in a forming press without changing the cylinder setup.
Product Changeover Stops
Adjust the mechanical stopper up to 75mm during packaging line size changes to hit new downstream positions accurately.
Heavy-Duty Clamp Tuning
Dial in the exact clamping depth at machine setup, using the 6136N pull force to secure large workpieces while preventing over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75 the Right Cylinder?
Choose this 125mm bore when 80mm falls short—delivering 6136N pull force versus the 80mm bore's 2268N at 0.5MPa. The 75mm adjustment range is ideal for product changeovers on a line, letting you shift the end-stop position without physically swapping the cylinder or adding external stops. If your process requires a fixed, non-adjustable stroke, the standard SAI series is a simpler alternative.
When replacing an ISO 15552 cylinder, match the 125mm bore, 350mm stroke, 75mm adjustment, PT G1/2 port, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is 350mm, the 32mm rod diameter carries substantial side-load capacity, yet an external guide is still recommended for unsupported loads to prevent premature seal wear.
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 SAIJ125AX350-75 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw lets you shorten the effective 350mm stroke by up to 75mm, creating a usable travel window of 275 to 350mm. The adjuster is a mechanical stop for setting end positions and does not function as a lock to hold the load without air pressure.
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