Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20 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 a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20
The AirTAC SAIJ40X155-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 135-155 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it utilizes a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads.
This adjustable-stroke design allows you to fine-tune the retract end position during commissioning without adding external stops. The rear adjuster acts purely as a mechanical stop for deceleration alongside the standard air cushions; it is not a locking device and will not hold a load without continuous air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20 |
|---|---|
| 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 | 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 SAIJ40BX155-20
| 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 SAIJ40BX155-20 Is Used
End-Position Tuning
Dial in the exact retract distance within the 135-155 mm window during machine commissioning to perfect product placement without swapping hardware.
Product Changeover
Quickly adjust the stroke by up to 20 mm to accommodate slightly different product sizes on a packaging line, minimizing downtime.
Machining Clamps
Use the precise end-stop to position clamping jaws accurately, relying on the 628 N force to hold workpieces securely during light machining.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20 the Right Cylinder?
Choose this 40 mm bore when you need more power than the 32 mm variant (402 N push at 0.5 MPa) but want a smaller footprint than the 50 mm option (982 N). The 20 mm adjustment range is perfect for machine setups requiring precise variable end-stops rather than a fixed SAI cylinder. To replace an ISO 15552 cylinder, match the 40 mm bore, 155 mm stroke, PT port threads, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is under 300 mm, side-load risks are minimal, though the M12x1.25 rod thread handles standard loads effectively.
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 SAIJ40BX155-20 FAQ
At an operating pressure of 0.5 MPa, 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 lets you shorten the nominal 155 mm stroke by up to 20 mm, providing an effective travel range of 135 to 155 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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