Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40
The AirTAC SAIJ40X450-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel back by up to 40 mm. This creates a usable window of 410 to 450 mm, enabling precise end-position tuning at commissioning without swapping out the cylinder or adding bulky external stops. It delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa.
Built with a SUS304 stainless steel rod, this variant is well-suited for environments where corrosion resistance is required. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified, position sensing would require adding a -S variant to use with AirTAC CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAIJ40BX450-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SAIJ40BX450-40 Is Used
Machine Changeover
Quickly fine-tune the 410 to 450 mm stroke end-position during product size transitions without changing cylinder mounting or adding external stopper blocks.
Variable End-Stop Diverter
Provides adjustable mechanical travel limits for diverting items of varying sizes on a conveyor line, ensuring precise physical positioning.
Corrosive Assembly Lines
The SUS304 stainless steel rod handles clamping and positioning tasks in light manufacturing environments where standard carbon steel rods might face corrosion.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate force, such as the 628 N push at 0.5 MPa, but does not need the higher 982 N push capacity of the neighboring 50 mm bore. The adjustable 410-450 mm window is ideal for product-size changeovers on a line, letting operators dial in the exact end-stop mechanically rather than relying solely on sensor positions. For holding a load securely without continuous air pressure, this cylinder is insufficient; you should select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
Because this model features a 450 mm stroke, the 16 mm rod should be adequately supported by an external guide to prevent excessive side-loading and premature seal wear. When replacing an existing ISO 15552 cylinder, verify the bore, 450 mm stroke, 40 mm adjustment range, PT tapered port thread, and your required mounting style from the available 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 SAIJ40BX450-40 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides a push force of 628 N and a pull force of 528 N. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the nominal 450 mm stroke by up to 40 mm, providing an effective travel window of 410 to 450 mm. The adjuster is a mechanical stop for setting the end position and does not lock the load without live air pressure.
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