Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50S 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 SAIJ40BX270-50S
The AirTAC SAIJ40X270-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 220 to 270 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it integrates a SUS304 stainless steel rod for superior corrosion resistance and features a built-in magnet for position sensing.
This adjustable-stroke unit uses a PT tapered port thread and includes variable air cushions at both ends to manage deceleration. The extruded aluminum barrel retains standard ISO 15552 mounting interface dimensions while omitting the FB, CA, CB, and CR mount options, focusing instead on Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50S |
|---|---|
| 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 SAIJ40BX270-50S
| 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 SAIJ40BX270-50S Is Used
Machine Changeovers
Fine-tune the retract distance by up to 50 mm during product size transitions without disassembling the line or swapping hardware.
Variable End Stops
Dial in the exact 220 to 270 mm travel window required for delicate positioning tasks during initial machine commissioning.
Assembly Calibration
Adjust the end-of-stroke point on the fly to compensate for mechanical wear or tooling variations on the production floor.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-50S the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning without swapping cylinders or adding external stops, which is far more efficient than relying on a fixed-stroke SAI model. If your application requires less force, the 32 mm bore provides 563 N at 0.7 MPa; for higher loads, stepping up to the 50 mm bore yields 1374 N. Because the 270 mm stroke is relatively long, an external guide is recommended to prevent excessive side-load wear on the rod.
The rear adjuster acts strictly as a travel stop and cannot hold a load without continuous air pressure. For true fail-safe load holding, consider the SAIL or BSAI cylinder series instead. This specific SKU is dimensionally interchangeable with ISO 15552 cylinders, configured with a PT port thread, standard mounting options, and a -S magnet compatible with CMSE reed and DMSE electronic sensors.
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 SAIJ40BX270-50S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. The maximum thrust is 1130 N at 0.9 MPa.
The rear adjuster screw lets you shorten the effective travel from the 270 mm nominal stroke down to 220 mm. This stopper sets the end position but does not lock the load without live air pressure.
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