Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-50S 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 SAIJ40BX115-50S
The AirTAC SAIJ40X115-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 115 mm nominal stroke to a minimum of 65 mm. This 50 mm adjustment window is ideal for dialing in exact end positions during machine commissioning or product changeovers without needing external stops. Delivering 879 N of push force at 0.7 MPa, it is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance.
This model includes a piston magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors, which seat cleanly into the dual-side extruded barrel grooves. The G1/4 port and M12x1.25 rod thread provide a robust interface, while the rear adjuster acts purely as a mechanical stop to set the travel end. It does not lock or hold the load without live air pressure; for pilot-operated load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-50S |
|---|---|
| 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 SAIJ40BX115-50S
| 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 SAIJ40BX115-50S Is Used
Machine Changeover
Quickly dial in the 65-115 mm stroke window during product size transitions on a packaging line without swapping out the entire cylinder assembly.
Variable End-Stop Setup
Use the 50 mm rear adjustment range to fine-tune the retraction end position precisely during machine commissioning, eliminating the need to bolt on external physical stops.
Corrosive Environment Testing
Leverage the SUS304 stainless steel rod and adjustable travel to position samples or actuators reliably in light chemical or washdown testing enclosures.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-50S the Right Cylinder?
Select this 40 mm bore adjustable cylinder when an application requires variable end-stops between 65 and 115 mm, offering a setup flexibility that a fixed-stroke SAI cannot match. If your process demands less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, whereas upgrading to a 50 mm bore provides 1374 N for heavier payloads. To ensure a true ISO 15552 replacement match, verify the 115 mm stroke, 50 mm adjuster code, PT tapered port threads, and the -S magnet option.
When configuring your setup, remember the SAIJ supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The integrated variable air cushions at both ends handle end-of-stroke deceleration, but the external rear screw stopper itself is not a brake. For any load-holding requirements without continuous air supply, an external rod lock is necessary.
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 SAIJ40BX115-50S FAQ
The rear adjuster screw acts as a mechanical stopper that lets you shorten the effective travel from the 115 mm nominal stroke down to 65 mm, providing a 50 mm setup window. It only sets the end position and does not lock the load without live air pressure.
At a standard 0.7 MPa operating pressure, the SAIJ40X115-50-S generates 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at its maximum 0.9 MPa pressure.
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