Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40S 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 SAIJ125X550-40S
The AirTAC SAIJ125X550-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5MPa and features a 550mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 510-550mm usable travel window. This built-in adjustability allows you to dial in exact end-positions during commissioning or product changeovers without swapping out the entire cylinder or adding external mechanical stops.
Equipped with a standard carbon steel rod and a PT tapered G1/2 port, this unit includes a -S magnet for position sensing. The sensor groove on both sides of the extruded aluminum barrel accommodates AirTAC CMSE reed and DMSE solid-state switches. Remember that the rear adjuster acts purely as a travel stop to set deceleration, not as a lock; if you need to hold a load securely without live air pressure, you must use a SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40S |
|---|---|
| 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 SAIJ125X550-40S
| 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 SAIJ125X550-40S Is Used
Variable End-Stop Configuration
Set precise travel limits between 510mm and 550mm directly on the cylinder to accommodate different material lengths without installing separate external stopper blocks.
Production Line Changeover
Quickly adjust the retract end-position during product size transitions on automated packaging or assembly lines, drastically reducing machine downtime.
Commissioning Fine-Tuning
Dial in the exact end-of-stroke position during initial machine setup to absorb mechanical tolerances and ensure perfect alignment without machining spacer plates.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40S the Right Cylinder?
Choose this 125mm bore when your application requires higher thrust than an 80mm cylinder (which provides 2268N pull at 0.5MPa) but does not need the massive 9425N pull force of a 160mm bore. The 40mm adjustable window is ideal for machinery that processes multiple product sizes, letting you set variable end-stops on the fly instead of maintaining a stock of fixed-stroke SAI cylinders for each size.
Because this cylinder features a 550mm stroke, the long unsupported piston rod is susceptible to side-loading; an external guide rail must be used to prevent binding and premature seal wear. For a true ISO 15552 replacement match, ensure your setup accommodates the G1/2 port, uses a PT thread type, and supports the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2), which deliberately omits FB, CA, CB, and CR mounts.
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 SAIJ125X550-40S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. At the maximum 1.0MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective travel from its 550mm nominal stroke by up to 40mm, providing a usable window of 510 to 550mm. This stopper sets the travel end but does not lock or hold the load without continuous air pressure.
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