Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S
The AirTAC SAIJ125X275-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 225 to 275mm usable travel window, allowing you to trim the effective extension by up to 50mm during machine setup. The integrated -S magnet enables precise position detection with AirTAC CMSE reed or DMSE electronic sensors housed in the dual-side barrel grooves.
This 125mm bore actuator uses a PT tapered G1/2 port and a 32mm carbon steel rod with an M27x2 thread, providing substantial rigidity against side loads. The rear stopper acts purely as a travel limit and works alongside standard air cushions to decelerate the load, but it does not hold the load without live air pressure. For position holding, an external rod lock or SAIL cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-50S Is Used
Product Size Changeovers
Dial in the exact 225-275mm end position for varying part lengths on a packaging line without changing out the physical actuator hardware.
Heavy Press Tuning
Fine-tune the extension limit on a 6136N press operation during commissioning to prevent over-travel and crush damage to components.
Variable End-Stop Forming
Adjust the rear stopper to modify the stroke depth for different material forming recipes, relying on the cushion to decelerate the heavy load.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-50S the Right Cylinder?
Choose this 125mm bore unit when an application demands high thrust that smaller bores cannot provide, such as stepping up from an 80mm bore that yields 2513N at 0.5 MPa. The adjustable 225-275mm window is ideal for production lines running mixed product sizes, enabling rapid changeovers without physically swapping the cylinder or adding external mechanical stops. When specifying a replacement, ensure the ISO 15552 footprint, 275mm nominal stroke, 50mm adjustment range, PT port, and -S magnet match your mounting layout.
Because the 275mm stroke is substantial, the unsupported rod length during extension requires an external guide to prevent excessive bending loads, even with the rigid 32mm rod. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. The standard TPU seals handle ambient temperatures up to 70C, while Viton H seals are available for high-heat environments.
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 SAIJ125X275-50S FAQ
The rear adjuster screw allows you to shorten the nominal 275mm stroke by up to 50mm, creating a 225-275mm usable travel window. It acts as a mechanical stop to set the end position and does not lock the load when air pressure is removed.
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
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