Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40S 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 SAIJ40AX950-40S
The AirTAC SAIJ40X950-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 910 to 950 mm. Delivering 628 N of push force at 0.5 MPa, it integrates a SUS420J2 stainless steel rod for improved corrosion resistance and pairs with a PT tapered G1/4 port. The extruded aluminum barrel includes sensor grooves on both sides, and the included magnet (-S) supports CMSE reed and DMSE electronic switches for precise position detection.
Because the 950 mm stroke approaches the maximum standard limit for this bore, the external adjuster provides critical fine-tuning at commissioning without adding external stops. The rear mechanism acts purely as a travel stop for end-position deceleration alongside the variable air cushions, meaning it cannot hold a load without live air pressure. For load-holding requirements without continuous pressure, a SAIL or BSAI variant is recommended.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40S |
|---|---|
| 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 SAIJ40AX950-40S
| 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 SAIJ40AX950-40S Is Used
Machine Changeover
Dial in the 910-950 mm travel window during product size changes on a conveyor line without physically replacing the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract end-position at commissioning to perfectly align a 628 N push action, using the rear stopper to compensate for mechanical tolerances.
Sensor-Driven Testing
Leverage the dual-side sensor grooves and built-in magnet to trigger DMSE solid-state switches at a custom intermediate position within the adjusted travel range.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-40S the Right Cylinder?
Choose this 40 mm bore when 628 N of push force at 0.5 MPa is sufficient, stepping down from a 50 mm bore that yields 982 N, or up if your application requires heavier thrust. The adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, allowing you to dial back the travel by up to 40 mm rather than swapping a fixed-stroke SAI cylinder. To match this ISO 15552 replacement, specify the 40 mm bore, 950 mm stroke, 40 mm adjustment, PT G1/4 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and the -S magnet option.
Given the 950 mm stroke length, the 16 mm rod and M12x1.25 thread will carry moderate side loads, but an external guide is strongly recommended to prevent rod bending and premature seal wear. The cylinder operates at speeds of 30-800 mm/s and relies on its 30 mm air cushions at both ends to absorb kinetic energy.
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 SAIJ40AX950-40S FAQ
At 0.5 MPa operating pressure, 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 can deliver up to 128 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 950 mm nominal stroke by up to 40 mm, creating a 910 to 950 mm usable travel window. It only sets the end position and does not lock or hold the load without live air pressure.
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