Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S
The AirTAC SAIJ40X280-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 280 mm stroke that can be dialed back by up to 40 mm, creating a precise 240-280 mm usable travel window for exact end-position tuning. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod and includes a magnet for CMSE and DMSE sensors.
This adjustable-stroke model uses a PT tapered port thread and operates at speeds of 30-800 mm/s. The rear adjuster acts strictly as a travel stop for commissioning and product changeovers, meaning it does not hold the load without live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, and the cylinder supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAIJ40BX280-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SAIJ40BX280-40S Is Used
Variable End-Stop Tuning
Dial in the exact 240-280 mm travel distance during machine commissioning to accommodate varying product lengths without adding external mechanical stops.
Product Changeover
Rapidly adjust the retract position by up to 40 mm when switching a production line to a new item size, minimizing downtime and physical modifications.
Fine Positioning Calibration
Use the rear stopper screw to fine-tune the end-of-stroke deceleration and final resting position, ensuring delicate components are not crushed.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40S the Right Cylinder?
Choose this 40 mm bore when you need precise end-stop tuning without swapping cylinders, stepping down from a 50 mm bore (982 N push at 0.5 MPa) to save space, or up from a 32 mm bore (402 N). The adjustable 240-280 mm window is perfect for variable end stops. Because the stroke is 280 mm, ensure external guides support the load to prevent rod side-load damage. If position holding without live air is required, select a SAIL or BSAI cylinder instead of this standard SAIJ. To match this ISO 15552 replacement exactly, specify the 40 mm bore, 280 mm stroke, 40 mm adjustment, PT port, SUS304 rod, -S magnet, and the appropriate mounting.
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 SAIJ40BX280-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 280 mm down to 240 mm. This stopper only sets the end position and deceleration; it does not lock or hold the load without continuous air pressure.
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