Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20
The AirTAC SAIJ40X140-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 120-140 mm usable travel window. Delivering 628N of push force at 0.5 MPa, it is built with a corrosion-resistant SUS304 stainless steel rod and utilizes PT tapered ports for a reliable seal.
This adjustable model allows you to fine-tune end positions at commissioning without adding external stops. It retains the standard extruded aluminum barrel with sensor grooves on both sides, and the rear screw functions purely as a travel stop, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAIJ40BX140-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SAIJ40BX140-20 Is Used
Machine Changeover
Dial in the 120-140mm travel window during product size transitions without physically swapping the cylinder or bolting on external stops.
End-Position Tuning
Use the rear adjuster to fine-tune the retract end position at commissioning, hitting exact dimensional targets on the fly.
Variable End Stops
Set custom stroke limits for multi-part production lines, relying on the stopper to set travel rather than hold the load.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20 the Right Cylinder?
Choose this 40mm bore when you need precise variable end-stops for machine changeover, as it provides 628N push force at 0.5 MPa. If your application requires less force, step down to the 32mm bore which offers 402N. The 16mm rod and M12x1.25 thread handle moderate side loads well, but long unsupported strokes still need an external guide.
This SKU is dimensionally interchangeable per ISO 15552 and includes a PT port, SUS304 rod, and a 20mm stroke adjustment. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since it lacks a magnet, it does not support CMSE or DMSE sensors.
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 SAIJ40BX140-20 FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. It can reach up to 1130N of push force at 0.9 MPa.
The rear adjuster allows you to shorten the 140mm nominal stroke by up to 20mm, creating a 120-140mm usable travel window. The adjuster acts as a mechanical stop and does not lock or hold the load without live air pressure.
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