Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20
The AirTAC SAIJ40X75-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 55 to 75 mm without adding external stops. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread for a rigid pneumatic connection.
Because the rear adjuster acts purely as a travel stop to set the retract end position, it will not hold the load without live air pressure. This unit shares the standard extruded aluminum barrel with dual sensor grooves, but utilizes a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) omitting the FB, CA, CB, and CR foot or pivot brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-20 Is Used
Machine Changeover
Dial in the 55-75 mm travel window during product size transitions to set exact retract positions without physically swapping cylinders.
End-Position Tuning
Fine-tune the rear stopper at commissioning to absorb mechanical tolerances and achieve precise end-stroke placement.
Corrosive Environments
The SUS304 stainless steel rod makes this 40 mm bore profile cylinder suitable for assembly lines exposed to moisture or mild washdowns.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-20 the Right Cylinder?
Choose this 40 mm bore when your application requires roughly 628 N of push force at 0.5 MPa, or step down to a 32 mm bore providing 402 N if your load is lighter. The 20 mm adjustment range is ideal for machine setups requiring precise end-position tuning during product changeovers, saving the downtime of physically swapping a fixed-stroke SAI cylinder.
For position holding without continuous air pressure, this cylinder cannot lock the load—you would need an external pilot-operated check valve or an AirTAC SAIL or BSAI locking cylinder. When replacing an ISO 15552 unit, match the 40 mm bore, 75 mm stroke, 20 mm adjustment, PT port thread, and standard mounting interface. Since the 75 mm stroke is under 300 mm, side-load risks are minimal, though the 16 mm rod and M12x1.25 thread handle moderate side 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 SAIJ40BX75-20 FAQ
At 0.5 MPa it provides 628 N of push force and 528 N of pull force. The operational speed range is 30-800 mm/s.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 75 mm nominal stroke by up to 20 mm, creating a usable 55-75 mm travel window. It is a stop, not a lock, and requires live air to hold the load.
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 SAIJ40BX75-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.