Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30S 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 SAIJ125AX550-30S
The AirTAC SAIJ125X550-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 520 to 550 mm. Built with a SUS420J2 stainless steel rod and a built-in magnet for CMSE or DMSE sensors, it delivers 8590 N of pull force at 0.7 MPa. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting.
This adjustable-stroke design allows you to fine-tune the retract end position at commissioning or during product changeovers without swapping the cylinder or adding external stops. It includes variable air cushions at both ends to manage kinetic energy, but note that the rear adjuster acts as a travel stop, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30S |
|---|---|
| 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 SAIJ125AX550-30S
| 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 SAIJ125AX550-30S Is Used
Variable End-Stop Setup
Dial in the retract position precisely within the 520-550 mm window during machine commissioning to accommodate different product lengths without hardware changes.
Product Line Changeover
Quickly adjust the stroke stop when switching between product sizes on a packaging line, reducing downtime and avoiding the need to swap out entire cylinders.
Heavy-Duty Positioning
Leverage the 8590 N pull force at 0.7 MPa to move heavy pallets or fixtures, relying on the rear stop to set the exact resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-30S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial thrust, such as 5734 N pull at 0.5 MPa, combined with precise end-position tuning. If you need less force, stepping down to an 80 mm bore yields 2268 N pull at 0.5 MPa. Because this model features a 550 mm stroke, an external guide is recommended to prevent excessive side-loading on the 32 mm rod and M27x2 rod thread.
Select the SAIJ over a fixed-stroke SAI when your machine setup demands a variable end-stop for different product sizes. To replace an ISO 15552 cylinder, match the 125 mm bore, 550 mm stroke, 30 mm adjustment, PT G1/2 port, and -S magnet. For load-holding without live air pressure, use an external rod lock or pilot-operated check valve, as the adjuster and cushion do not hold the load.
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 SAIJ125AX550-30S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder provides 8590 N of pull force and 8590 N of push force. At 0.5 MPa, it delivers 5734 N of pull force.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm, creating a usable travel window of 520 to 550 mm. The adjuster acts as a mechanical stop to fine-tune the end position and does not lock the load without live air pressure.
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