Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50S 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 SAIJ125AX275-50S
The AirTAC SAIJ125X275-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 225 to 275 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for position detection.
This model uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the end position and deceleration point; it does not hold the load without live air. For load-holding without pneumatic pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50S |
|---|---|
| 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 SAIJ125AX275-50S
| 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 SAIJ125AX275-50S Is Used
Machine Changeovers
Dial in the exact retract position within the 225-275mm window during product size transitions without changing the cylinder or adding external stopper blocks.
Variable End Stops
Use the 50mm rear adjustment screw to fine-tune the end-of-stroke deceleration point during machine setup, preventing harsh impacts on sensitive tooling.
Packaging Positioning
Provides 6136N of thrust at 0.5 MPa for pushing heavy packaging materials, while allowing quick mechanical adjustments for different carton sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires 6136N of thrust at 0.5 MPa (or up to 11045N at 0.9 MPa) and on-the-fly end-position tuning without swapping out physical components. If your process needs less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa. The adjustable stroke is ideal for product-size changeovers on a packaging line, letting operators fine-tune the retract end via the rear screw rather than adding external stops.
When replacing an ISO 15552 cylinder, match the 125mm bore, 275mm stroke, 50mm adjustment range, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. Because the stroke is 275mm, ensure external guiding is used to prevent excessive side-load on the 32mm rod and M27x2 rod thread.
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 SAIJ125AX275-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw lets you trim the effective travel back by up to 50mm from the 275mm nominal stroke, creating a 225-275mm usable window. The adjuster is a mechanical stop for setting the end position and does not lock the load without live air pressure.
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