Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-30S 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 SAIJ40AX950-30S
The AirTAC SAIJ40X950-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 920-950 mm usable travel window, allowing you to dial back the 950 mm nominal stroke by up to 30 mm. It delivers 879 N of push force at 0.7 MPa, fitting a robust mid-range force class.
This unit includes a SUS420J2 stainless steel rod and a magnet for CMSE or DMSE sensors. Because the 950 mm stroke is long, an external guide is recommended to manage side loads on the 16 mm rod. The rear adjuster acts purely as a travel stop for end-position tuning, not as a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-30S |
|---|---|
| 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 SAIJ40AX950-30S
| 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 SAIJ40AX950-30S Is Used
Machine Changeover
Dial in the exact retract distance within the 920-950 mm window when switching product sizes on a line.
End-Position Tuning
Fine-tune the final resting position during commissioning without swapping the cylinder or adding external mechanical stops.
Variable End Stops
Adjust the travel limit on the fly to accommodate different material lengths fed through a long-stroke handling system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-30S the Right Cylinder?
Choose this adjustable-stroke model when you need to fine-tune the retract end-position during commissioning or product changeover without adding external stops. If you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa; for higher force, a 50 mm bore provides 1374 N. For fixed travel without a rear screw, use a standard SAI cylinder.
This SKU is configured with PT tapered ports, a SUS420J2 rod, and a magnet for position sensing. It uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). If your application requires holding a load without live air pressure, use a SAIL or BSAI cylinder instead of relying on the adjuster.
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 SAIJ40AX950-30S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 950 mm down to 920 mm. It is a travel stop for tuning end positions, not a lock, and it will not hold a load without live air pressure.
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