Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75 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 SAIJ40BX270-75
The AirTAC SAIJ40X270-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 270 mm travel that can be mechanically dialed back by up to 75 mm, yielding a precise 195-270 mm usable stroke window for fine-tuning end positions during commissioning. Belonging to the 40 mm bore class, it generates 879 N of push force and 728 N of pull force at 0.7 MPa.
This variant is configured with a SUS304 stainless steel piston rod for superior corrosion resistance and uses PT tapered port threads with a G1/4 connection. The extruded aluminum barrel includes sensor grooves on both sides for direct switch mounting. The rear adjuster acts strictly as a mechanical stop to set the travel end and deceleration point alongside the standard air cushions, but it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75 |
|---|---|
| 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 SAIJ40BX270-75
| 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 SAIJ40BX270-75 Is Used
Product Changeover
Dial in the 195-270 mm stroke window on the fly to accommodate different package lengths on a packaging line without changing cylinders.
Machine Setup
Use the 75 mm rear mechanical stop to fine-tune the exact end-of-stroke position during initial commissioning, avoiding external shims.
Variable End Stops
Ideal for assembly stations where the pressing or clamping depth requires occasional adjustment across a wide 75 mm range.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires a 628 N push force at 0.5 MPa, stepping up from a 32 mm bore that offers 402 N, or down from a 63 mm bore providing 1559 N. The 75 mm adjustment range is ideal for machine setups requiring variable end stops or frequent product-size changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. To match this exact configuration for an ISO 15552 replacement, specify the 40 mm bore, 270 mm stroke, PT G1/4 port, and the SUS304 rod material. Since the 270 mm stroke is moderately long, ensure external guiding is used to prevent excessive side-loading on the rod. For applications requiring true load-holding without live air, consider the SAIL locking cylinder instead of relying on the adjuster. Available mountings include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX270-75 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N and the pull force to 728 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from the nominal 270 mm down to 195 mm. It sets the end position but does not hold the load without live air pressure.
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