Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40
The AirTAC SAIJ40X140-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to dial back the 140 mm nominal travel by up to 40 mm, creating a usable window from 100 to 140 mm. Delivering 628 N of push force at 0.5 MPa, it provides the thrust needed for standard machine movements while allowing precise end-position tuning without swapping out the cylinder body.
This variant is configured with a SUS304 stainless steel rod for superior corrosion resistance and uses a PT tapered port thread. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, and the adjustable stopper acts purely as a travel end deceleration point, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAIJ40BX140-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SAIJ40BX140-40 Is Used
Product Changeover
Quickly reconfigure the retract depth from 140 mm down to 100 mm to handle varying package sizes on a packaging line without changing the cylinder.
Commissioning Calibration
Dial in the exact end-position during machine setup, using the 40 mm adjustment range to absorb mechanical tolerances and perfect the tooling alignment.
Variable End-Stop Diverter
Adjust the stroke on the fly for a pneumatic diverter arm, ensuring the stopper meets different product profiles precisely without repositioning the mount.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40 the Right Cylinder?
Selecting this 40 mm bore cylinder makes sense when a process requires a variable end-stop within a 100-140 mm range, such as accommodating multiple product sizes on a single conveyor line. If your application needs less force, stepping down to the 32 mm bore yields 402 N at 0.5 MPa; if more thrust is required, the 50 mm bore provides 982 N. Because the stroke is 140 mm, side-loading is minimal, but always guide the load externally to protect the rod seals.
Choose this adjustable SAIJ over a fixed-stroke SAI when you need to fine-tune the retract position at commissioning without adding external stops. Remember that the rear adjuster does not hold the load without live air pressure; for true drop prevention, integrate an external pilot-operated check valve or select the SAIL or BSAI series. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: 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 SAIJ40BX140-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If operated at 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the effective stroke from its 140 mm nominal length by up to 40 mm, giving a usable travel window of 100 to 140 mm. This stopper only sets the travel end and does not lock or hold the load without continuous air pressure.
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