Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S
The AirTAC SAIJ125X300-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window between 270 and 300 mm without adding external stops. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy-duty positioning. The barrel is extruded aluminum with sensor grooves on both sides, and this -S variant includes a magnet for use with CMSE reed and DMSE electronic sensors.
This model uses a 32 mm carbon steel rod with an M27x2 thread and PT tapered G1/2 ports. The rear adjuster functions strictly as a travel stop for end-position tuning, not a lock, meaning it cannot hold loads without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-30S Is Used
Machine Changeover
Dial in the 270-300 mm travel window during product size transitions to set precise end-stops without physically swapping the cylinder.
Heavy Material Handling
Utilize the 6136 N push force at 0.5 MPa to move heavy pallets or workpieces, relying on the rear stopper to trim the final position.
Assembly Press Positioning
Fine-tune the press stroke end-point on the fly, using the 30 mm adjuster to accommodate different component heights on the assembly line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial thrust (6136 N at 0.5 MPa) and the flexibility to dial in the exact end-of-stroke position during machine commissioning. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier loads. The adjustable stroke is ideal for product-size changeovers on a packaging line, offering a distinct advantage over a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 300 mm nominal stroke, 30 mm adjustment range, G1/2 PT ports, and the -S magnet option. Because the stroke is 300 mm, the extended travel combined with the 32 mm rod means you should use an external guide to prevent excessive side-loading and premature seal wear. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X300-30S FAQ
At an operating pressure of 0.5 MPa, 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 1251 kgf at 1.0 MPa.
The rear adjuster acts as an external stopper that allows you to shorten the effective stroke by up to 30 mm, creating a usable travel window of 270 to 300 mm. It is a travel stop for fine-tuning end positions, not a load-holding lock.
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