Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100S 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 SAIJ40BX120-100S
The AirTAC SAIJ40X120-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 120 mm stroke that can be dialed back by up to 100 mm, yielding a highly flexible 20-120 mm usable travel window for precise commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm bores and heavier 50 mm units.
This specific SKU is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and ships with a magnet (-S) for position sensing. You can mount AirTAC CMSE reed or DMSE electronic solid-state switches directly into the sensor grooves machined on both sides of the extruded aluminum barrel. It uses a PT tapered port thread and relies on the standard SAIJ mounting set, which includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100S |
|---|---|
| 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 SAIJ40BX120-100S
| 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 SAIJ40BX120-100S Is Used
Machine Setup & Changeover
Dial in the exact end position during line changeovers by trimming the travel window anywhere from 20 to 120 mm without physically replacing the actuator.
Variable End-Stop Positioning
Perfect for test fixtures where the rear stopper screw is micro-adjusted to find the optimal extension length before finalizing a machine design.
Corrosion-Resistant Actuation
The SUS304 stainless steel rod handles washdown or humid environments while providing repeatable positioning feedback via CMSE or DMSE sensors.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-100S the Right Cylinder?
Select this 40 mm bore when an application demands 628 N push force at 0.5 MPa but requires extreme flexibility in the end-of-stroke position; if you need less force, stepping down to a 32 mm bore yields 402 N, while a 50 mm bore provides 982 N. The massive 100 mm adjustment range is ideal for prototyping or product changeovers, allowing you to shorten the effective travel from 120 mm down to 20 mm without swapping the cylinder or adding external mechanical stops. Because the rear adjuster acts strictly as a travel stop and the air cushion only manages deceleration, neither will hold a load without live air pressure; for true load-holding, consider an external rod lock or the AirTAC SAIL series.
To match this exact ISO 15552 interchangeable cylinder, specify a 40 mm bore, 120 mm nominal stroke, 100 mm adjustment range, PT port threads, and the -S magnet option. Since the 120 mm stroke is below the 300 mm threshold, side-load stress on the 16 mm rod is moderate, though external guides are still recommended for heavy off-center 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 SAIJ40BX120-100S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 100 mm. This creates a usable travel window of 20 to 120 mm, allowing you to fine-tune the end position at commissioning without changing the cylinder.
At 0.5 MPa operating pressure, it provides 628 N of push force and 528 N of pull force. If you run it at 0.7 MPa, the push force increases to 879 N.
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