Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 270mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50
The AirTAC SAIJ40X270-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a highly flexible 220-270 mm usable stroke window, letting you dial in the exact end position during commissioning without swapping out the barrel or adding external stops.
Delivering 879 N of push force at 0.7 MPa, this 40 mm bore model is equipped with a SUS304 stainless steel rod for superior corrosion resistance. It uses PT tapered port threads (G1/4) and relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×270 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX270-50 Is Used
Machine Changeover
Fine-tune the retract end-position within the 220-270 mm window during product size changeovers on a packaging line without mechanical rework.
Variable End-Stop
Dial in the exact clamping distance for assemblies of varying heights, using the rear screw to set the precise stop point.
Commissioning Calibration
Safely adjust the travel limit during initial machine setup to prevent crashes, finding the optimal stroke length before locking down the sequence.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50 the Right Cylinder?
Choose this adjustable-stroke variant over a fixed SAI cylinder when your application requires variable end-stops or frequent product changeovers. If you need higher thrust, stepping up to the 50 mm bore yields 1374 N at 0.7 MPa. Remember that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder will not hold a load without live air pressure, so consider an external pilot-operated check valve for fail-safe load holding. For a direct ISO 15552 replacement match, specify the 40 mm bore, 270 mm stroke, 50 mm adjustment, PT port, and your required mounting style from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 270 mm, ensure adequate external guidance to prevent excessive side-loading on the rod.
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 SAIJ40 Adjustable Cylinder SAIJ40BX270-50 FAQ
The rear adjuster allows you to mechanically shorten the nominal 270 mm stroke by up to 50 mm, providing an effective travel window of 220 to 270 mm. This lets you set the exact end position without changing the cylinder.
At a standard 0.7 MPa operating pressure, the SAIJ40X270-50 provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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