Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20 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 SAIJ40AX950-20
The AirTAC SAIJ40X950-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 950 mm travel by up to 20 mm for a precise 930-950 mm usable window. Delivering 628 N of push force at 0.5 MPa, it features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a PT tapered G1/4 port and operates at speeds between 30-800 mm/s. Because the stroke is 950 mm, the 16 mm rod and M12x1.25 thread will experience leverage forces; an external guide is recommended to prevent excessive side-loading. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20 |
|---|---|
| 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 SAIJ40AX950-20
| 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 SAIJ40AX950-20 Is Used
Long-Stroke Machining Setup
Fine-tune the 930-950 mm travel window during machine commissioning to perfectly position a part for machining without swapping out the entire actuator.
Product Changeover Stops
Quickly adjust the retract end-stop by up to 20 mm on a conveyor sorting line when handling different package sizes, ensuring precise product placement.
Assembly Station Calibration
Dial in the exact end position during initial assembly station calibration, absorbing mechanical tolerances over the long 950 mm stroke for accurate repeatability.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20 the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping down from a 50 mm bore (982 N) or up from a 32 mm bore (402 N). The adjustable stroke is selected over a fixed SAI cylinder when you need to fine-tune the retract end position during commissioning or product changeovers without adding external stops. To match this ISO 15552 footprint for a direct replacement, confirm the 950 mm stroke, 20 mm adjustment, PT G1/4 port, and required mounting style.
For any stroke of 950 mm, always support the load with an external guide to protect the rod from bending. Note that the rear adjuster and air cushions only decelerate the travel end; they are not locks. For load-holding without live air, consider an AirTAC SAIL or BSAI cylinder. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR.
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 SAIJ40AX950-20 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 128 kgf.
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the effective stroke from the nominal 950 mm down to 930 mm. It sets the travel end during commissioning but does not lock the load without live air pressure.
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