Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-50S 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 SAIJ40BX140-50S
The AirTAC SAIJ40X140-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 879N of push force at 0.7MPa and provides a usable travel window of 90 to 140mm, allowing you to dial in the exact retract position without swapping the barrel. The extruded aluminum body includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE solid-state switches.
This specific SKU ships with a SUS304 stainless steel piston rod (option B) for superior corrosion resistance and carries a PT tapered G1/4 port. The rear adjuster acts purely as a mechanical stop to fine-tune the end position during commissioning; it is not a lock and will not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-50S |
|---|---|
| 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 SAIJ40BX140-50S
| 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 SAIJ40BX140-50S Is Used
Product Changeover
Quickly reconfigure the retract distance on packaging lines handling varying container sizes, using the 90-140mm travel window to adapt without changing hardware.
Commissioning Calibration
Fine-tune the end-stop during initial machine setup to perfectly time the 628N extend motion with downstream conveyors or robotic pick points.
Machining Clamps
Dial in the exact clamping position for varying part geometries, leveraging the SUS304 rod for durability in demanding production environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-50S the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI when your machine setup requires variable end-stops or frequent product-size changeovers, as it eliminates the need to bolt on external stops. If your application demands less force, stepping down to a bore 32 cylinder yields 563N of push force at 0.7MPa. For higher loads, a bore 50 cylinder provides 1374N.
When seeking an ISO 15552 replacement, match these exact attributes: 40mm bore, 140mm stroke, 50mm adjustment range, PT G1/4 port, SUS304 rod, and a magnet for sensors. The SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). For holding loads without live air, use a SAIL or BSAI lock cylinder instead of relying on the adjuster.
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 SAIJ40BX140-50S FAQ
At 0.7 MPa operating pressure, this 40mm bore cylinder generates 879N of push force and 528N of pull force. It can reach a maximum push force of 1130N at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the 140mm nominal stroke by up to 50mm, creating a usable travel window of 90 to 140mm. This stopper only sets the end position and decelerates the travel; it does not lock or hold the load without continuous air pressure.
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