Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75S 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 SAIJ40BX140-75S
The AirTAC SAIJ40X140-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 140 mm stroke that can be fine-tuned backward by up to 75 mm, yielding a highly flexible 65-140 mm usable travel window for precise end-position tuning. Belonging to the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and uses PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides, and because this model includes a magnet (-S), it integrates directly with AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts purely as a mechanical stop to set the travel end and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75S |
|---|---|
| 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 SAIJ40BX140-75S
| 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 SAIJ40BX140-75S Is Used
Product Changeovers
Dial in the 65-140 mm travel window rapidly during production line format changes, accommodating multiple package sizes without physically replacing the actuator.
End-Position Tuning
Fine-tune the retract distance at machine commissioning using the rear stopper, avoiding the need to add external shims or spacer blocks to the fixture.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod to push and pull components in humid or washdown manufacturing environments while maintaining precise stroke limits.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75S the Right Cylinder?
Choose this 40 mm bore when an application requires moderate force (628 N push at 0.5 MPa) alongside a highly variable end-stop. If your setup demands less thrust, the 32 mm bore offers 402 N; if you need significantly more clamping power, stepping up to the 50 mm bore provides 982 N. The generous 75 mm adjustment range on this 140 mm stroke allows for massive product changeovers without swapping the cylinder, unlike a fixed-stroke SAI model.
For dimensionally interchangeable per ISO 15552 replacements, match the 40 mm bore, 140 mm stroke, -75 mm adjustment, PT ports, and the -S magnet. Mounting options are restricted to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Since the stroke is 140 mm, side-load is minimal, but always ensure the 16 mm rod and M12x1.25 rod thread are properly aligned to prevent premature seal wear. For load-holding without continuous air, utilize a SAIL lock or BSAI clamp-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 SAIJ40BX140-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear mechanical screw acts as a stop, allowing you to shorten the 140 mm nominal stroke by up to 75 mm. This creates a usable travel window of 65-140 mm, enabling variable end positions without changing the cylinder.
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