Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20 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 SAIJ40BX120-20
The AirTAC SAIJ40X120-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 120 mm stroke that can be fine-tuned backward by up to 20 mm, yielding a usable travel window of 100-120 mm to perfectly dial in end positions during commissioning.
Delivering 879 N of push force at 0.7 MPa, this bore size uses a G1/4 port and 30 mm cushion. It is built with a SUS304 stainless steel rod (option B) for corrosion resistance, uses PT tapered port threading, and excludes a magnet. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20 |
|---|---|
| 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 SAIJ40BX120-20
| 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 SAIJ40BX120-20 Is Used
Machine Changeover
Dial in the 100-120 mm travel window during product size changes without swapping out the entire cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract stroke by up to 20 mm at commissioning to absorb mechanical tolerances and achieve precise final positioning.
Assembly Station Feed
Provides 879 N of push force at 0.7 MPa for pushing or lifting subcomponents, with the flexibility to shorten travel if the feed distance changes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX120-20 the Right Cylinder?
Choose this 40 mm bore when you need variable end-stops for product changeovers rather than a fixed-stroke SAI cylinder. If your application requires less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa; stepping up to a 50 mm bore provides 1374 N. Because the stroke is 120 mm, external side-load guides are less critical here, though the 16 mm rod and M12x1.25 thread handle moderate loads well.
For a true ISO 15552 replacement match, specify the 40 mm bore, 120 mm stroke, 20 mm adjustment, PT port, and no magnet. Note that SAIJ supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. If you need true load-holding without live air, select the SAIL or BSAI series instead, as this adjuster is not a lock.
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 SAIJ40BX120-20 FAQ
It features a rear adjusting screw that allows you to shorten the effective travel from the nominal 120 mm down to 100 mm, creating a 100-120 mm adjustable window. The adjuster acts as a mechanical stop and does not lock the load in place without continuous air pressure.
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder generates 879 N of push force and 724 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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