Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40S 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 SAIJ40BX140-40S
The AirTAC SAIJ40X140-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end-position without swapping out the unit. By turning the external stopper screw, you achieve a usable travel window of 100-140 mm, letting you dial in the exact return point during machine commissioning or product size changeovers. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific configuration uses a SUS304 stainless steel piston rod (option B) for superior corrosion resistance in wet or washdown environments. The extruded aluminum barrel includes sensor grooves on both sides, and because this is an -S variant, it contains a magnet ready for AirTAC CMSE reed and DMSE electronic solid-state sensors. The standard PT tapered porting is G1/4, and the unit reaches speeds of 30-800 mm/s.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40S |
|---|---|
| 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 SAIJ40BX140-40S
| 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 SAIJ40BX140-40S Is Used
Product Changeover
Dial in the new retract position from 140 mm down to 100 mm on packaging lines when switching to a different package size, eliminating the need to physically swap cylinders.
Commissioning Setup
Fine-tune the exact end-of-stroke position during machine build to clear mechanical interference, adjusting the rear stopper screw rather than machining custom spacers.
Variable End Stops
Provide a flexible retraction point for light assembly presses, using the 628 N thrust at 0.5 MPa to seat components while adjusting the depth as tooling wears.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-40S the Right Cylinder?
Select this 40 mm bore when your application needs a 100-140 mm adjustable travel window and moderate thrust. If you require less force, stepping down to a 32 mm bore yields 402 N of push at 0.5 MPa; if you need more power, a 50 mm bore provides 982 N. Choose this SAIJ adjustable model over a fixed-stroke SAI when you need to trim the end-stop on the fly without adding external physical stops.
Remember that the rear adjuster functions purely as a travel stop and relies on the variable air cushions for end-of-stroke deceleration; it does not lock or hold the load without continuous live air pressure. For true fail-safe load holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. To match this ISO 15552 footprint exactly, specify: 40 mm bore, 140 mm stroke, 40 mm adjustment, PT G1/4 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mountings, and the -S magnet option.
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 SAIJ40BX140-40S FAQ
The rear adjuster screw acts as a mechanical stop that can shorten the stroke by up to 40 mm. For this 140 mm stroke model, this provides a usable travel window of 100-140 mm, allowing precise end-position tuning at commissioning without changing the cylinder.
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. This specific SKU features a SUS304 stainless steel piston rod (option B) for excellent corrosion resistance, and the barrel is an extruded aluminum profile cylinder dimensionally interchangeable per ISO 15552.
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