Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S
The AirTAC SAIJ40X120-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. It provides a usable travel window of 100-120 mm, letting you dial back the 120 mm nominal stroke by up to 20 mm during commissioning without adding external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant includes a SUS304 stainless steel rod for superior corrosion resistance and comes with a magnet for CMSE or DMSE sensors. The extruded aluminum barrel includes sensor grooves on both sides. It uses a G1/4 port and offers adjustable air cushions at both ends to decelerate the moving load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAIJ40BX120-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SAIJ40BX120-20S Is Used
Machine Changeover
Quickly fine-tune the 100-120 mm travel window during product size changes on a packaging line without swapping the cylinder.
Variable End-Stop Setup
Dial in the exact retract position at commissioning using the rear stopper screw, avoiding the need for external mechanical stops.
Corrosive Sorting
Leverage the SUS304 stainless steel rod and 528 N pull force to reliably divert items in washdown or mildly corrosive environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20S the Right Cylinder?
Choose this 40 mm bore model when you need 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore that provides 402 N, or down from a 63 mm bore that yields 1559 N. The adjustable stroke is ideal for product changeovers on a line, allowing you to set a variable end-stop precisely. Remember that the rear adjuster acts only as a travel stop to set deceleration; it does not hold the load without live air. For load-holding without pressure, consider an external rod lock or the SAIL series.
This SAIJ40X120-20-S is dimensionally interchangeable per ISO 15552. To match this exact configuration, specify a 40 mm bore, 120 mm stroke, 20 mm adjustment, PT tapered ports, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ40BX120-20S FAQ
At 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 mechanically shorten the 120 mm nominal stroke by up to 20 mm, creating a 100-120 mm usable travel window. It acts as a stop to tune the end position and does not lock the load without live air pressure.
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