Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S
The AirTAC SAIJ40X400-75-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a nominal 400mm travel but includes an integrated stopper screw that allows you to trim the effective stroke back by up to 75mm, creating a precise 325-400mm usable positioning window. This means you can dial in the exact end position during machine commissioning or product changeovers without swapping out the physical cylinder or adding bulky external stops.
Delivering 628N of push force at 0.5MPa (1130N at 0.9MPa), this 40mm bore unit is built for demanding, repeatable motion. It features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing via AirTAC CMSE reed or DMSE electronic switches. The extruded aluminum barrel includes sensor grooves on both sides, and the unit supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) while omitting FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-75S Is Used
Machine Commissioning
Fine-tune the 325-400mm travel window during initial setup to perfectly strike a workpiece without machining custom spacers.
Product Changeover
Rapidly adapt the end-stop position on a packaging line when switching to a different carton or part size.
Variable End Stops
Provide a mechanical stop for product indexing on a conveyor, allowing operators to dial back the stroke up to 75mm as needed.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-75S the Right Cylinder?
Choose this adjustable-stroke SAIJ over a fixed-stroke SAI when your application requires variable end-stops or frequent product size changeovers. The 40mm bore yields 628N push force at 0.5MPa; if your load demands less thrust, a 32mm bore provides 402N, while stepping up to a 50mm bore offers 982N. Because the 400mm stroke is substantial, the 16mm rod and M12x1.25 thread provide rigidity, but an external guide rail is still strongly recommended to prevent excessive side-loading on long unsupported travels.
Remember that the rear adjuster acts purely as a travel stop and deceleration point, not a locking device. The SAIJ40X400-75-S cannot hold a load in place without live air pressure. If your application requires true fail-safe load holding, consider the SAIL pneumatic lock series, the BSAI clamp-lock cylinder, or an external rod lock. This cylinder uses PT tapered ports and is dimensionally interchangeable per ISO 15552 standards.
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 SAIJ40BX400-75S FAQ
A rear stopper screw lets you shorten the 400mm nominal stroke by up to 75mm, giving an adjustable travel window of 325-400mm. This allows precise end-position tuning at commissioning without replacing the cylinder.
At 0.5MPa it provides 628N of push force and 528N of pull force. At 0.9MPa, the push force increases to 1130N.
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