Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30 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 SAIJ40BX115-30
The AirTAC SAIJ40X115-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, letting you dial back the 115mm nominal stroke by up to 30mm to achieve a precise 85-115mm usable travel window. Built with a SUS304 stainless steel rod and a PT tapered port, it delivers 879N of push force at 0.7MPa. This adjustable design eliminates the need to swap cylinders or bolt on external stops during machine commissioning or product changeovers.
The rear adjuster functions strictly as a travel stop that sets the end position, working alongside the 30mm air cushions at both ends to decelerate the load. It does not hold the load without live air pressure; for position holding, consider the SAIL or BSAI series. This SAIJ model uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30 |
|---|---|
| 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 SAIJ40BX115-30
| 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 SAIJ40BX115-30 Is Used
Machine Changeover
Quickly fine-tune the end position during product size changes on a packaging line without swapping the cylinder.
Variable End Stops
Dial in the exact 85-115mm travel distance required for multi-format assembly stations.
Commissioning Tuning
Trim the stroke up to 30mm during initial setup to achieve perfect mechanical timing without adding external stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30 the Right Cylinder?
Choose this 40mm bore when your application requires 879N of push force at 0.7MPa, stepping up from the 32mm bore which provides 563N. The adjustable 85-115mm window is ideal for setups needing variable end-stops without external hardware. If your process requires holding a load without continuous air pressure, this cylinder will not suffice as the adjuster is not a lock. For drop-in replacements, match the 40mm bore, 115mm stroke, PT port, and SUS304 rod material; note that sensors are not included as no magnet is specified.
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 SAIJ40BX115-30 FAQ
At 0.7 MPa operating pressure, the 40mm bore generates 879N of push force and 528N of pull force. It can reach up to 1130N push at 0.9 MPa.
The rear adjuster allows you to shorten the 115mm nominal stroke by up to 30mm, providing a usable travel window of 85-115mm for fine-tuning the retract end position during commissioning.
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