Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30S 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 SAIJ40BX120-30S
The AirTAC SAIJ40X120-30-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 90 to 120 mm, allowing you to dial back the nominal 120 mm stroke by up to 30 mm during commissioning without swapping the unit. Delivering 879 N of push force at 0.7 MPa, it handles mid-range automation tasks with precision.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet for CMSE and DMSE sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear adjuster functions strictly as a mechanical stop for end-position tuning, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30S |
|---|---|
| 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 SAIJ40BX120-30S
| 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 SAIJ40BX120-30S Is Used
Machine Changeover
Dial in the exact 90 to 120 mm travel needed when switching product sizes on a packaging line, using the rear stopper for rapid mechanical resets.
End-Position Tuning
Fine-tune the retract stroke at commissioning to perfect seating pressure without adding external stop collars or machining new cylinder mounts.
Variable Diverter Stops
Adjust the stroke length on the fly to handle different package dimensions on a conveyor system without changing out the entire actuator.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-30S the Right Cylinder?
Choose this adjustable model over a fixed-stroke SAI when your application requires variable end-stops or frequent product-size changeovers. If you need higher force, stepping up to a 50 mm bore yields 1374 N of push force at 0.7 MPa; dropping to a 32 mm bore reduces it to 563 N. Since the 120 mm stroke is under 300 mm, side-load risks are moderate, but external guidance is still recommended for heavy lateral loads.
To hold a load securely without live air pressure, the SAIJ rear stop is insufficient—consider the SAIL or BSAI series instead. For ISO 15552 replacement matching, specify a 40 mm bore, 120 mm stroke, 30 mm adjustment, PT tapered port threads, 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 SAIJ40BX120-30S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The nominal 120 mm stroke can be mechanically shortened by up to 30 mm via a rear adjusting screw, creating a usable travel window of 90 to 120 mm. This acts as a physical stop to set the retract end-position and does not lock the load without air pressure.
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