Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20
The AirTAC SAIJ40X950-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 930 to 950 mm usable travel window, allowing you to dial back the effective stroke by up to 20 mm during commissioning without swapping the cylinder or bolting on external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This unit is equipped with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads with a G1/4 connection. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning position sensing via CMSE or DMSE switches is not supported without modification. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 950 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 SAIJ40BX950-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×950 | 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 SAIJ40BX950-20 Is Used
Variable End Stops
Ideal for conveyor diverters where the retract position needs a 930-950 mm window to accommodate slightly different package sizes without mechanical rebuilds.
Machine Changeover
Enables rapid fine-tuning of the end position during product format changes, reducing setup downtime on automated packaging lines.
Long-Stroke Assembly
Provides precise retract positioning over a 950 mm travel path, useful in automated assembly cells where exact end-of-stroke placement is critical.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate force, stepping up from a 32 mm bore that provides 402 N at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, letting you fine-tune the retract end-position on the fly rather than relying on a fixed-stroke SAI cylinder. Because the stroke is 950 mm, an external guide is strongly recommended to prevent excessive side loading on the rod.
For a true ISO 15552 replacement, match the 40 mm bore, 950 mm stroke, 20 mm adjustment, PT port thread, and SUS304 rod material. Remember that the rear screw stopper only sets the travel end; it is not a lock. For load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder instead. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX950-20 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 950 mm stroke by up to 20 mm, creating a 930 to 950 mm adjustable travel window. It functions as a mechanical stop to fine-tune the end position and is not a locking device.
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