Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50 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 SAIJ40BX120-50
The AirTAC SAIJ40X120-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 120 mm stroke that can be dialed back by up to 50 mm, creating a precise 70-120 mm usable travel window for commissioning. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa. The piston rod is constructed from SUS304 stainless steel, offering high corrosion resistance for demanding environments.
This model features a PT tapered port thread and operates at speeds between 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts purely as a mechanical stop to set the end position and deceleration point; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50 |
|---|---|
| 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 SAIJ40BX120-50
| 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 SAIJ40BX120-50 Is Used
Machine Setup Fine-Tuning
Dial in the exact end-of-stroke position during machine commissioning, trimming the 120 mm travel back by up to 50 mm to perfectly align packaging folds or sealing heads.
Product Size Changeover
Quickly adapt a production line for different product lengths by adjusting the rear stopper, shifting the effective stroke within the 70-120 mm window without changing hardware.
Variable End-Stop Positioning
Set precise mechanical travel limits for testing fixtures, using the rear screw to define the exact retraction point while relying on the standard air cushion for deceleration.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50 the Right Cylinder?
Choose this adjustable-stroke SAIJ model over a fixed SAI cylinder when your application requires variable end-stops or fine-tuning during product changeover without physically swapping the cylinder or adding external stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. Conversely, stepping up to a 50 mm bore provides 982 N of push force.
This configuration includes a PT port thread, SUS304 stainless steel rod, and no magnet. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. Because the 120 mm stroke is under 300 mm, side-load stress on the 16 mm rod is moderate, though external guides are still recommended for heavy lateral 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 SAIJ40BX120-50 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 50 mm from the nominal 120 mm, providing a usable travel window of 70-120 mm. The adjuster acts as a mechanical stop to set the end position and does not function as a lock or brake.
At 0.5 MPa operating pressure, 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.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.