Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-50S 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 SAIJ40AX950-50S
The AirTAC SAIJ40X950-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position without swapping out the unit. It provides a usable travel window of 900-950 mm, letting you dial back the nominal 950 mm stroke by up to 50 mm during commissioning or product changeovers. Delivering 628 N of push force at 0.5 MPa, it is built with an SUS420J2 stainless steel rod for improved corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors.
This model uses a G1/4 port and M12x1.25 rod thread. Because the stroke is 950 mm, the 16 mm rod needs external guidance to prevent excessive side-loading on the seals. The rear screw acts purely as a travel stop for deceleration alongside the standard air cushions; it does not hold the load without live air pressure. For load-holding requirements, consider an external pilot-operated check valve or the SAIL lock cylinder series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-50S |
|---|---|
| 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 SAIJ40AX950-50S
| 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 SAIJ40AX950-50S Is Used
Product Size Changeover
Quickly adjust the 950 mm stroke down by up to 50 mm to accommodate varying package lengths on a packaging line without changing the cylinder.
Machine Setup Fine-Tuning
Dial in the exact end-of-stroke position during commissioning to perfectly time a press or transfer operation within the 900-950 mm window.
Variable End Stops
Use the rear adjuster to set precise retraction points for diverting items on a long conveyor belt, adapting to different product widths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-50S the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N push force at 0.5 MPa, stepping down from a 50 mm bore (982 N) for a lighter footprint, or up from a 32 mm bore (402 N) when more thrust is needed. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops for different product sizes, allowing precise 900-950 mm tuning without adding external stopper blocks.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 950 mm stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Given the 950 mm stroke, always support the load with an external guide rail to protect the piston rod.
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 SAIJ40AX950-50S 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 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the effective travel from the nominal 950 mm down to 900 mm. It acts as a mechanical stop for end-position tuning and works alongside the air cushions, but it does not lock the load without continuous air pressure.
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