Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100S 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 SAIJ125X550-100S
The AirTAC SAIJ125X550-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore and a 550 mm nominal stroke, yielding a usable travel window of 450 to 550 mm. This wide 100 mm adjustment band allows operators to dial in the exact retract end-position during commissioning or product changeovers without swapping out the entire actuator. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant includes a standard carbon steel piston rod and a PT tapered port thread. The extruded aluminum barrel incorporates sensor grooves on both sides, and because this SKU includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position detection. The variable air cushions at both ends work alongside the rear stopper screw to decelerate the load smoothly, though the adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100S |
|---|---|
| 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 SAIJ125X550-100S
| 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 SAIJ125X550-100S Is Used
Variable End-Stop Positioning
Ideal for machines processing different material lengths, allowing operators to dial back the retract stroke by up to 100 mm to accommodate varying part sizes without changing hardware.
Heavy-Duty Changeover
Provides 6136 N of push force at 0.5 MPa for large press or lift stations, enabling rapid product line changeovers by simply adjusting the rear stopper screw to the new required travel.
Commissioning Fine-Tuning
Allows engineers to precisely set the 450 to 550 mm travel window during machine setup, ensuring perfect alignment and preventing over-travel before finalizing the pneumatic circuit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-100S the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when an application requires substantial thrust, such as 6136 N at 0.5 MPa, combined with variable end-stop positioning. If a project needs less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa. Conversely, moving up to a 160 mm bore provides 10053 N. The adjustable stroke is specifically chosen over a fixed-stroke SAI cylinder when a machine handles multiple product sizes, allowing the retract distance to be fine-tuned on the fly rather than adding external mechanical stops.
Because the nominal stroke is 550 mm, the unsupported rod length is significant; an external guide should be used to prevent excessive side-loading on the piston rod. For ISO 15552 dimensional interchangeability, match the 125 mm bore, 550 mm stroke, 100 mm adjustment range, PT port thread, and -S magnet. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. If true load-holding is required without continuous air pressure, a standard SAIJ will not suffice; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X550-100S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it achieves a maximum push force of 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from its 550 mm nominal length down to as little as 450 mm. This creates a 450 to 550 mm usable travel window for fine-tuning the end position, though it functions as a stop and not a load-holding lock.
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