Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20
The AirTAC SAIJ40 Adjustable Cylinder SAIJ40AX155-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ40 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20
The AirTAC SAIJ40X155-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 155 mm nominal stroke that can be fine-tuned backward by up to 20 mm, creating a 135-155 mm usable travel window for precise end-position calibration during commissioning.
This variant features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance over standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this specific SKU is not configured with a magnet. The rear adjuster acts strictly as a mechanical stop to set the travel end and does not lock or hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 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 | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAIJ40AX155-20 Is Used
Machine Commissioning Tuning
Dial in the exact 135-155 mm retract position during setup without physically remounting the cylinder or adding external stopper blocks.
Product Changeover Stops
Quickly adjust the end-stop by up to 20 mm on a packaging line to accommodate slight length differences between product variants.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX155-20 the Right Cylinder?
If your setup demands less force, the 32 mm bore offers 563 N at 0.7 MPa; if more force is needed, stepping up to the 50 mm bore provides 1374 N at 0.7 MPa. Choose this adjustable-stroke SAIJ model over a fixed-stroke SAI cylinder when you need to dial in the exact retract position on the fly without adding external stops or swapping the cylinder.
For ISO 15552 interchangeability, match the 40 mm bore, 155 mm stroke, 20 mm adjustment, PT G1/4 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this model omits the FB, CA, CB, and CR mounts. Because the stroke is under 300 mm, side-load stress on the M12x1.25 rod thread is moderate, but external guiding remains recommended for heavy lateral loads. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
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 SAIJ40AX155-20 FAQ
The rear adjusting screw acts as a mechanical stop that lets you shorten the 155 mm nominal stroke by up to 20 mm, providing a usable travel window of 135 to 155 mm. It only sets the travel end and does not lock or hold the load without live air pressure.
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