Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50
The AirTAC SAIJ125X90-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to trim the 90 mm nominal travel back by up to 50 mm. This yields a highly flexible 40-90 mm usable stroke window, perfect for dialing in exact end positions during machine commissioning without swapping hardware. It delivers substantial thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa.
This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and utilizes PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is configured without a magnet. The rear adjuster functions strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125AX90-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125AX90-50 Is Used
Product Size Changeovers
Quickly modify the 40-90 mm stroke window during production line changeovers to accommodate different package dimensions without replacing the cylinder.
Commissioning End-Stop Tuning
Fine-tune the final retract position during machine setup to achieve exact alignment, using the rear screw to dial in the precise 90 mm travel limit.
Heavy Fixture Positioning
Leverage the 6136 N push force to move heavy machining fixtures into place, relying on the adjuster to prevent overtravel at the end of the stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-50 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the force for heavier fixtures, but a 160 mm bore (10053 N) would be physically oversized. The 50 mm adjustment range is ideal for product-size changeovers on a line, letting operators set variable end-stops on the fly instead of machining external stops. For load-holding without continuous air, a standard SAIJ is insufficient—integrate an external pilot-operated check valve or select the related SAIL or BSAI series.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 90 mm stroke, 50 mm adjustment, PT G1/2 port, and your required mounting style. SAIJ supports a specific subset of mounts: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the 32 mm rod thread and substantial piston handle high loads, ensure your external guiding mechanism handles any induced side-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 SAIJ125AX90-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as an external stop that lets you shorten the 90 mm nominal stroke by up to 50 mm, creating a 40-90 mm usable travel window. It only sets the end position and is not a lock.
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