Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40 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 SAIJ40AX950-40
The AirTAC SAIJ40X950-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 910-950mm usable travel window. Delivering 628N of push force at 0.5MPa, it utilizes a SUS420J2 stainless steel rod for enhanced durability against moisture. The extruded aluminum barrel includes sensor grooves on both sides.
This model allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. It operates at 30-800mm/s with PT tapered ports and variable air cushions at both ends. The rear adjuster acts strictly as a travel stop, not a lock, meaning it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40 |
|---|---|
| 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 SAIJ40AX950-40
| 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 SAIJ40AX950-40 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 910-950mm window during machine commissioning without machining new hard stops.
Product Size Changeover
Quickly adapt a production line for different part lengths by adjusting the rear stopper screw up to 40mm.
Long-Stroke Positioning
Handle extended travel positioning tasks where a 628N push force is sufficient and fine-tuning is required at the end of stroke.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40 the Right Cylinder?
Choose this 40mm bore when a 32mm bore (402N push at 0.5MPa) lacks the necessary thrust, but a 50mm bore (982N) would be excessive. The 40mm adjustment code is selected when you need a 40mm variable end-stop window to dial in exact positioning during machine setup or product changeover, rather than relying on a fixed-stroke SAI cylinder.
Because the stroke is 950mm, the 16mm rod requires external guiding to prevent excessive side-loading and premature seal wear. For an ISO 15552 replacement, match the 40mm bore, 950mm stroke, PT port thread, SUS420J2 rod, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. If the application requires load-holding without continuous air pressure, use an external rod lock or pilot-operated check valve.
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 SAIJ40AX950-40 FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7MPa, the push force increases to 879N.
The rear adjuster screw allows you to shorten the effective stroke by up to 40mm from the 950mm nominal length, giving a usable travel range of 910-950mm. It functions as a mechanical stop and does not lock the load without live air.
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