Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S
The AirTAC SAIJ40X45-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, enabling you to dial back the nominal 45 mm stroke by up to 30 mm. This yields a highly versatile 15-45 mm usable travel window, perfect for fine-tuning end positions during commissioning without swapping out the physical barrel. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific SKU is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes a magnet (-S) for position sensing. It integrates seamlessly with AirTAC CMSE reed and DMSE solid-state switches mounted in the dual-side sensor grooves. The fluid porting utilizes PT tapered threads (G1/4), and the extruded aluminum barrel maintains a true ISO 15552 mounting interface.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAIJ40BX45-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SAIJ40BX45-30S Is Used
Machine Changeover
Rapidly adjust the 15-45 mm travel window during product size changeovers on a packaging line without disassembling the cylinder mount.
End-Position Tuning
Dial in the exact retract stop during machine commissioning to perfectly time a delicate pressing or indexing operation.
Variable Stops
Set specific mechanical end-stops for testing different component sizes without needing to bolt on external physical stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30S the Right Cylinder?
Choose this 40 mm bore when an application demands precise mechanical end-position tuning within a 15-45 mm travel window, offering a step down from the 50 mm bore (which provides 982 N push at 0.5 MPa) if you need lighter positioning rather than raw thrust. The rear adjuster acts purely as a travel stop for deceleration and positioning, meaning it does not hold the load without live air pressure. For applications requiring true load-holding without continuous air, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 45 mm stroke, 30 mm adjustment range, PT G1/4 port, and the -S magnet requirement. Mounting options for this adjustable series include the reduced set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ40BX45-30S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjusting screw allows you to shorten the effective stroke by up to 30 mm from the nominal 45 mm, creating a 15-45 mm usable travel window. This stopper only sets the travel end and does not lock or hold the load without live air pressure.
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