Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S
The AirTAC SAIJ125X550-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 520-550mm usable travel window, allowing you to dial back the 550mm nominal stroke by up to 30mm during commissioning. This built-in adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure.
It features a carbon steel piston rod and a PT tapered port thread. Because the 550mm stroke is relatively long for the 32mm rod diameter, an external guide is recommended to manage side loads. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-30S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 520-550mm window during machine setup to accommodate different product sizes without changing hardware.
Product Changeover
Quickly adjust the stroke end-position on a packaging line when switching to a new carton format, leveraging the 30mm adjustment range.
Heavy Forming Operations
Utilize the 6136N push force at 0.5 MPa for pressing or forming tasks where the exact end-stop must be finely tuned on-site.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30S the Right Cylinder?
Choose this 125mm bore cylinder when you need variable end-stops for product changeovers, stepping up from a 100mm bore that provides 3927N of push force at 0.5 MPa. If your application requires less force, a smaller bore might be more efficient. The adjustable rear screw allows you to fine-tune the retract position without swapping the cylinder or bolting on external stops, unlike a fixed-stroke SAI model.
For ISO 15552 replacement matching, verify the 125mm bore, 550mm stroke, 30mm adjustment range, PT port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If your machine needs true load-holding without live air, use a SAIL lock or BSAI clamp-lock cylinder instead of relying on this adjuster.
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 SAIJ125X550-30S FAQ
The rear adjuster screw acts as an external stopper, allowing you to shorten the effective stroke by up to 30mm. This creates a 520-550mm usable travel window for fine-tuning the end position at commissioning, but it does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
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