Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20S 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 SAIJ125AX275-20S
The AirTAC SAIJ125X275-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, with a usable travel window of 255 to 275 mm created by the 20 mm adjustment screw. This allows you to dial in the exact retract end-position at commissioning without adding external stops. The barrel is extruded aluminum with sensor grooves on both sides.
This specific SKU features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a magnet for position sensing. It supports AirTAC CMSE reed and DMSE solid-state switches. The rear adjuster acts purely as a mechanical stop to set the travel end; it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20S |
|---|---|
| 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 SAIJ125AX275-20S
| 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 SAIJ125AX275-20S Is Used
Product Changeovers
Fine-tune the 255-275 mm retract window during production line changeovers to accommodate varying part sizes without physically replacing the cylinder.
Commissioning Calibration
Dial in the exact end-stop position during initial machine setup, using the rear adjuster to perfect the stroke without machining new hard stops.
Heavy Assembly Clamping
Leverage the 6136N push force at 0.5 MPa to secure heavy components during assembly, while relying on the SUS420J2 rod for durability in industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires 6136N of push force at 0.5 MPa (or 8590N at 0.7 MPa). If your process needs less force, stepping down to an 80 mm bore yields 2513N. If you need more clamping power, a 160 mm bore provides 10053N. The adjustable stroke is ideal for product changeovers, letting you fine-tune the retract distance on the fly rather than swapping a fixed-stroke SAI cylinder.
With a 275 mm stroke, the 32 mm diameter rod and M27x2 thread provide substantial rigidity, but an external guide is recommended to manage side loads on longer travels. This SAIJ configuration uses a PT tapered port and supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. Operating speed ranges from 30 to 500 mm/s.
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 SAIJ125AX275-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 275 mm down to 255 mm. It sets the retract end-position but does not lock the load without continuous air pressure.
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