Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-30S 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 SAIJ40BX140-30S
The AirTAC SAIJ40X140-30-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 110-140 mm usable travel window, allowing you to dial back the 140 mm nominal stroke by up to 30 mm. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm bores and heavier 50 mm units.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the PT tapered ports ensure a tight pneumatic seal. The rear adjuster acts purely as a mechanical stop to set end-of-travel, not as a lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-30S |
|---|---|
| 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 SAIJ40BX140-30S
| 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 SAIJ40BX140-30S Is Used
Product Changeover
Dial in the 110-140 mm retract stop during packaging format changes without disassembling the machine or adding spacer blocks.
End-Position Tuning
Compensate for mechanical wear or sensor drift by trimming the stroke up to 30 mm during routine commissioning.
Variable Ejector Stops
Adjust the physical end-stop position on the fly to handle varying product lengths on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-30S the Right Cylinder?
Choose this 40 mm bore when a 32 mm cylinder (402 N push @ 0.5 MPa) lacks thrust but a 50 mm unit is physically oversized. The 30 mm adjustment range is perfect for product changeovers, letting you fine-tune the retract position on the machine without swapping cylinders or adding external stops. For strokes of 140 mm, side-load is moderate, but an external guide rail is recommended for heavy off-center loads.
As a dimensionally interchangeable ISO 15552 cylinder, it uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB/CA/CB/CR options. If your process requires the load to be held mechanically without live air pressure, this adjustable stop will not suffice; consider an AirTAC SAIL or BSAI clamping cylinder 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 SAIJ40BX140-30S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If you need higher thrust, stepping up to a 50 mm bore increases push force to 982 N at the same pressure.
A rear adjusting screw lets you shorten the 140 mm nominal stroke by up to 30 mm, creating a 110-140 mm usable travel window. This stopper sets the retract end-position but does not lock the load without live air.
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