Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30 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 SAIJ125X550-30
The AirTAC SAIJ125X550-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 520 to 550 mm, allowing you to dial back the nominal 550 mm stroke by up to 30 mm during commissioning or product changeovers. Delivering a robust 8590 N push force at 0.7 MPa, it handles heavy actuation tasks while maintaining standard ISO 15552 mounting interchangeability.
The extruded aluminum barrel includes dual sensor grooves for positioning feedback. The 32 mm carbon steel rod and M27x2 thread provide substantial rigidity, but with a 550 mm stroke, an external guide is recommended to manage side loads. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30 |
|---|---|
| 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 SAIJ125X550-30
| 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 SAIJ125X550-30 Is Used
Machine Setup Changeover
Fine-tune the 520-550 mm stroke end-position during product size changeovers on heavy machinery without adding external physical stops.
Variable End-Stop Actuation
Dial in the exact retract position within the 30 mm adjustment window for multi-stage processes requiring precise, repeatable heavy-force endpoints.
Heavy Press Positioning
Leverage the 8590 N push force at 0.7 MPa to position heavy materials, using the rear screw to trim the final approach distance accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-30 the Right Cylinder?
Select this 125 mm bore cylinder when a 6136 N push force at 0.5 MPa is insufficient, or step down to the 100 mm bore if 5497 N at 0.7 MPa is adequate for your application. The adjustable 520-550 mm travel window is ideal for machinery requiring variable end-stops or fine-tuning at setup, avoiding the need to physically swap out a fixed-stroke SAI cylinder. When matching an ISO 15552 replacement, verify the 550 mm stroke, 30 mm adjustment range, PT tapered port thread, and the required mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke exceeds 300 mm, ensure an external guide is used to support the load and prevent rod deflection. Note that the rear adjuster is a stop, not a lock; for load-holding without live air, consider the SAIL or BSAI series.
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 SAIJ125X550-30 FAQ
The rear adjuster screw lets you shorten the effective travel from the nominal 550 mm down to 520 mm. It acts as a mechanical stop to fine-tune the end position at commissioning without swapping the cylinder, but it does not lock the load without live air pressure.
This 125 mm bore cylinder generates a push force of 6136 N at 0.5 MPa and 8590 N at 0.7 MPa, with a maximum push force of 11045 N at 0.9 MPa.
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