Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S
The AirTAC SAIJ40X115-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel. With a 115 mm nominal stroke and a 75 mm adjustment range, you gain a wide 40-115 mm usable travel window for highly flexible end-position tuning. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid choice for medium-duty positioning.
This specific SKU is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel provides sensor grooves on both sides, and the PT tapered port thread ensures a tight pneumatic connection.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAIJ40BX115-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SAIJ40BX115-75S Is Used
Variable End-Stop Tuning
Dial in the exact retraction point between 40 and 115 mm during machine setup, allowing rapid adaptation to new product dimensions without mechanical rebuilds.
Sensor-Driven Changeover
Leverage the built-in magnet with DMSE electronic sensors to confirm adjustable end positions across different automated routines in packaging lines.
Corrosion-Resistant Actuation
Utilize the SUS304 stainless steel rod in light manufacturing environments where moisture or mild chemicals would degrade standard carbon steel rods.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-75S the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm option. The 75 mm adjustment range is exceptionally large, meaning you can dial in the exact 40 to 115 mm stroke during commissioning or product changeovers without swapping cylinders or adding external stops. Because the stroke is under 300 mm, side-load stress on the 16 mm rod is manageable, though external guides remain recommended for heavy lateral loads.
For ISO 15552 replacement matching, verify the 40 mm bore, 115 mm nominal stroke, PT port thread, and the -S magnet requirement. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; if you need true position holding, consider the SAIL or BSAI locking cylinders. This SAIJ model supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX115-75S 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 adjuster screw allows you to shorten the 115 mm nominal stroke by up to 75 mm, creating a usable travel window of 40 to 115 mm. The adjuster acts as a mechanical stop to fine-tune the end position and is not a locking device.
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