Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-40S 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 SAIJ40BX115-40S
The AirTAC SAIJ40X115-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel anywhere in a 75-115 mm window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses a PT tapered port thread. An integrated magnet enables position sensing with CMSE reed or DMSE electronic switches.
The external stopper screw lets you dial in the exact retract end position during commissioning without swapping hardware or adding external stops. Remember that this rear adjuster acts strictly as a travel stop and deceleration point, not a load-holding lock; maintaining position requires continuous live air. It supports a standard speed range of 30-800 mm/s and includes adjustable air cushions at both ends to absorb kinetic energy.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-40S |
|---|---|
| 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 SAIJ40BX115-40S
| 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 SAIJ40BX115-40S Is Used
Product Changeovers
Quickly adjust the retract distance by up to 40 mm to accommodate varying package sizes on a packaging line without changing the cylinder.
End-Position Calibration
Fine-tune the exact stopping point during machine commissioning to achieve precise alignment without adding external mechanical stops.
Dynamic Diverter Stops
Use the 75-115 mm travel window to alter the stroke length on the fly for sorting different product profiles on a conveyor belt.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-40S the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning on the fly, such as accommodating product size changes on a conveyor line. If you need higher thrust, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa, while dropping down to a 32 mm bore reduces it to 402 N. Unlike a fixed-stroke SAI cylinder, this adjustable model prevents the need to inventory multiple cylinders for slightly varying stroke lengths.
For a seamless ISO 15552 replacement, match the 40 mm bore, 115 mm nominal stroke, 40 mm adjustment range, PT port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because the 16 mm rod and M12x1.25 thread handle moderate side loads well, this cylinder is suitable for dynamic setups, but always verify structural support when guiding external loads.
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 SAIJ40BX115-40S FAQ
At a 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 40 mm, creating a usable travel window of 75 to 115 mm. This stopper sets the end position but does not lock the load without live air pressure.
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