Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20 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 SAIJ40BX270-20
The AirTAC SAIJ40X270-20 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 270 mm stroke that can be dialed back by up to 20 mm, giving you a 250-270 mm usable travel window for precise end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches if needed later. Unlike fixed-stroke SAI units, this model allows you to trim the retract position without adding external stops. The rear adjuster acts strictly as a travel stop and does not hold the load without continuous air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20 |
|---|---|
| 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 SAIJ40BX270-20
| 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 SAIJ40BX270-20 Is Used
Changeover Calibration
Dial in the 250-270 mm travel window during product size changeovers without disassembling the machine or adding physical shims.
End-Stop Trimming
Use the rear adjuster to fine-tune the retract position by up to 20 mm, perfect for setting precise clamping or pressing depths.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in packaging or food-grade environments where moisture is present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20 the Right Cylinder?
Choose this 40 mm bore cylinder when your application requires 628 N of push force at 0.5 MPa and a 250-270 mm stroke window. If your setup needs less force, stepping down to a 32 mm bore provides 402 N; if you need more clamping power, moving up to a 50 mm bore yields 982 N. The adjustable stroke is highly beneficial for product changeovers, letting you fine-tune the end stop on the machine rather than swapping the entire cylinder. For strokes of 300 mm or more, you would typically need an external guide to prevent side-load wear, but this 270 mm stroke sits safely below that threshold while still benefiting from the 16 mm rod diameter.
When matching this for an ISO 15552 replacement, verify the 40 mm bore, 270 mm stroke, 20 mm adjustment range, PT G1/4 port, and your required mounting bracket from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the SAIJ series omits the FB, CA, CB, and CR mounts. If your process requires the cylinder to hold its position without live air pressure, this adjustable stopper will not act as a brake; you should look at the SAIL or BSAI locking cylinder series instead.
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 SAIJ40BX270-20 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.7 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 270 mm down to 250 mm. It functions as a mechanical stop to fine-tune the end position and does not lock the load without continuous air pressure.
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