Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20
The AirTAC SAIJ40X50-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 30-50 mm usable travel window. This allows you to fine-tune the retract end-position at commissioning without swapping the unit or adding external stops. It delivers 628N of push force and 528N of pull force at 0.5 MPa.
This bore features a 16mm carbon steel rod with an M12x1.25 thread, paired with PT tapered ports for reliable pneumatic sealing. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Note that the rear adjuster acts strictly as a travel stop for deceleration, not a lock, so it cannot hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-20 Is Used
End-Position Tuning
Dial in the exact retract distance within the 30-50 mm window during machine commissioning without external shims.
Product Changeover
Quickly adapt the stroke end-stop on packaging lines when switching to a slightly different product size.
Corrosive Setup
Leverage the SUS304 stainless steel rod for precise positioning tasks in washdown or mildly corrosive environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-20 the Right Cylinder?
Choose this 40mm bore when a 32mm bore (402N push at 0.5 MPa) is too weak, but a 63mm bore (1559N push) is oversized and wastes space. The SAIJ40X50-20 is selected over a fixed-stroke SAI cylinder when a machine requires variable end-stops to accommodate minor product size changes on a line.
For a true ISO 15552 replacement match, verify the 50mm stroke, 20mm adjustment range, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2, omitting FB/CA/CB/CR). Because this variant uses a SUS304 stainless steel rod, it is ideal for environments where corrosion resistance is a priority.
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 SAIJ40BX50-20 FAQ
At a 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw lets you shorten the nominal 50mm stroke by up to 20mm, creating a 30-50mm usable travel window. The adjuster acts as a mechanical stop for end-position tuning and does not lock the load without continuous air pressure.
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