Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-50 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 SAIJ40BX950-50
The AirTAC SAIJ40X950-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to a 900-950 mm window. It delivers a push force of 879 N at 0.7 MPa, making it well-suited for moderate load positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for straightforward detection integration.
This variant is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and utilizes PT tapered port threads (G1/4). Because the nominal stroke of 950 mm is a long travel distance, the 16 mm rod diameter and M12x1.25 thread will not prevent rod sag; an external guide is highly recommended to prevent excessive side-loading. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-50 |
|---|---|
| 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 SAIJ40BX950-50
| 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 SAIJ40BX950-50 Is Used
Long-Stroke Conveyor Diverter
Adjusts the retract position by up to 50 mm to accommodate different product widths on a sorting line without replacing the actuator.
Machine Commissioning Setup
Provides a 900-950 mm travel window to fine-tune the exact end-of-stroke position during initial equipment calibration.
Variable End-Stop Positioning
Ideal for assembly stations where the retracted tooling position must be dialed in precisely during product changeovers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-50 the Right Cylinder?
Choose this 40 mm bore when the 32 mm version (offering 563 N at 0.7 MPa) lacks the necessary push force, but you want to avoid the bulk of the 50 mm bore. The 50 mm adjustment range is selected over fixed-stroke SAI models when a machine requires variable end-stops or easy commissioning tweaks without swapping cylinders. For holding loads safely without live air, use a SAIL or BSAI cylinder, as the SAIJ adjuster only restricts travel. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Given the 950 mm stroke, always pair this cylinder with an external guide to manage side loads.
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 SAIJ40BX950-50 FAQ
At 0.7 MPa, this 40 mm bore cylinder provides a push force of 879 N and a pull force of 528 N. It can deliver up to 1130 N push force at 0.9 MPa.
The rear adjusting screw allows you to shorten the 950 mm nominal stroke by up to 50 mm, creating a usable travel window of 900-950 mm. It functions as a mechanical stop for end-position tuning and does not lock the load.
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