Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30
The AirTAC SAIJ40X85-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 55 to 85 mm, allowing you to dial back the 85 mm nominal stroke by up to 30 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it handles medium-duty positioning.
This variant uses a SUS304 stainless steel rod for corrosion resistance and includes a PT tapered port thread. The extruded aluminum barrel integrates sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAIJ40BX85-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SAIJ40BX85-30 Is Used
Machine Changeover
Quickly adjust the retract end-position by up to 30 mm when switching product sizes on a packaging line.
Fixture Calibration
Fine-tune the 55-85 mm travel window during initial setup to guarantee exact clamping without machining custom spacers.
Variable End Stops
Dial in the exact stroke needed for delicate pressing operations, using the rear screw to prevent over-travel.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30 the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning without adding external stops or swapping cylinders. If your application requires less force, the 32 mm bore offers 563 N at 0.7 MPa. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding, consider the SAIL or BSAI series. Because the stroke is under 300 mm, side-load risks are minimal, though the 16 mm rod handles standard lateral stresses well.
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 SAIJ40BX85-30 FAQ
The rear adjuster screw lets you mechanically shorten the stroke by up to 30 mm, creating a 55-85 mm usable travel window. It acts as a physical stop to fine-tune the retract position without replacing the cylinder.
At a 0.7 MPa operating pressure, the SAIJ40X85-30 provides 879 N of push force and 528 N of pull force. The maximum operating pressure is 1.0 MPa.
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