Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40 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 SAIJ40BX45-40
The AirTAC SAIJ40X45-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 45 mm stroke back by up to 40 mm. This creates a highly versatile 5 to 45 mm usable travel window, enabling precise end-position tuning at commissioning without swapping out the cylinder or bolting on external stops. It delivers 628 N of push force at 0.5 MPa, making it a robust choice for mid-range actuation.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical travel stop to set deceleration endpoints and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40 |
|---|---|
| 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 SAIJ40BX45-40
| 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 SAIJ40BX45-40 Is Used
Machine Changeover
Dial in the exact end-stop distance for different product sizes on a single line, using the 5-45 mm travel window to avoid adding external spacers.
Prototyping Cells
Fine-tune the retract position during commissioning to find the optimal mechanical stroke without machining new hard stops.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable actuation in packaging or food-grade areas where moisture resistance is critical.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40 the Right Cylinder?
Choose this 40 mm bore cylinder when your application requires 628 N of push force at 0.5 MPa, or step up to the 50 mm bore if you need 982 N. The 40 mm adjustment range on a 45 mm stroke is particularly valuable for prototyping cells or product-size changeovers where the exact stopping distance must be dialed in on the machine rather than machined into a hard stop. If you need a fixed travel distance, the standard SAI cylinder is simpler, but the SAIJ rear screw stopper saves engineering time during setup.
Because the rear adjuster is a stop and not a lock, this cylinder will not hold a load without live air; for fail-safe load holding, consider the SAIL or BSAI series. When replacing an ISO 15552 cylinder, match the 40 mm bore, 45 mm stroke, 40 mm adjustment, PT G1/4 port, and your required mounting interface from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
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 SAIJ40BX45-40 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm from the nominal 45 mm, giving a usable travel window of 5 to 45 mm. It acts as a mechanical stop to set the end position and does not lock the load.
At 0.5 MPa operating pressure, this 40 mm bore double-acting cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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