Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-75S 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 SAIJ40AX950-75S
The AirTAC SAIJ40X950-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 875 to 950 mm, allowing you to dial back the nominal stroke by up to 75 mm during commissioning. This bore delivers 879 N of pull force at 0.7 MPa, making it well-suited for moderate-load positioning tasks.
This specific configuration includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance over standard carbon steel. The -S magnet option enables position sensing with AirTAC CMSE reed and DMSE electronic switches, which seat directly into the dual-side sensor grooves on the extruded aluminum barrel. The PT tapered port threads match the G1/4 standard for this bore size.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-75S |
|---|---|
| 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 SAIJ40AX950-75S
| 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 SAIJ40AX950-75S Is Used
Machine Changeover
Fine-tune the retract end position by up to 75 mm when switching between product sizes on a packaging line, avoiding the need to physically swap out the entire cylinder.
Variable End-Stop Diverter
Adjust the travel window between 875 and 950 mm to alter the resting position of a diverter arm without repositioning hard-mounted external stops.
Commissioning Calibration
Dial in the exact end-of-stroke position during initial equipment setup to compensate for mechanical tolerances across a long 950 mm travel distance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-75S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (offering 345 N pull at 0.5 MPa) lacks the necessary force, but a 63 mm bore (1402 N pull at 0.5 MPa) would be excessive. The adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding, consider an SAIL or BSAI cylinder.
Because the 950 mm stroke approaches the maximum standard limit for this bore, the 16 mm rod diameter and M12x1.25 rod thread will experience significant leverage forces if the load is unsupported. An external guide is strongly recommended to prevent side-loading damage. For a direct ISO 15552 replacement, match the 40 mm bore, 950 mm stroke, 75 mm adjustment, PT port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting options, and the -S magnet requirement.
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 SAIJ40AX950-75S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 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 screw acts as a mechanical stop that lets you shorten the effective travel from 950 mm down to as little as 875 mm. It only sets the end position and does not lock the load without continuous air pressure.
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