Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S
The AirTAC SAIJ40X120-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 120mm nominal stroke that can be fine-tuned down by up to 75mm, yielding a highly versatile 45-120mm usable travel window. This wide adjustment band is ideal for machines requiring rapid product changeovers without mechanical rebuilds.
This specific SKU is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet (-S) for position sensing. It utilizes PT tapered ports and integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors mounted into the dual-side extruded aluminum barrel grooves.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAIJ40BX120-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SAIJ40BX120-75S Is Used
Product Changeovers
Dial in the 45-120mm travel window during format size changes on packaging lines, eliminating the need to physically swap cylinders for different carton lengths.
Sensor Calibration
Leverage the built-in magnet with DMSE electronic sensors to establish precise end-of-stroke signals while mechanically trimming the final position via the rear screw.
Corrosive Sorting
Rely on the SUS304 stainless steel rod to push parts in washdown or mildly corrosive environments while adjusting the stroke to accommodate varying material sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-75S the Right Cylinder?
Choose this 40mm bore when an application demands 628N push force at 0.5 MPa but requires extreme end-position flexibility; if you need less trim range, a fixed 120mm SAI cylinder is simpler, while stepping up to a 50mm bore yields 982N. The rear screw acts purely as a travel stop for deceleration and does not hold the load without live air—use a SAIL or BSAI cylinder for true pneumatic locking. To replace an ISO 15552 unit, match the 40mm bore, 120mm stroke, 75mm adjustment, PT G1/4 port, and -S magnet.
Because the 120mm stroke is relatively short, side-loading is minimal, but the robust 16mm rod and M12x1.25 thread handle standard guiding tasks well. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ40BX120-75S FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. If operated at 0.7 MPa, the push force increases to 879N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 120mm nominal stroke by up to 75mm. This creates a 45-120mm usable travel window for fine-tuning end positions without adding external stops.
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