Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75 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 SAIJ40BX140-75
The AirTAC SAIJ40X140-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 140 mm travel by up to 75 mm. This creates a highly flexible 65-140 mm usable stroke window, perfect for dialing in exact end positions during machine commissioning without swapping hardware. It delivers 628 N of push force at 0.5 MPa and features a robust M12x1.25 rod thread.
Built with a SUS304 stainless steel rod (option B), this unit excels in environments where corrosion resistance is paramount. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU lacks a magnet for switches. Fluid must be filtered to 40 um, and the cylinder operates at speeds between 30-800 mm/s.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75 |
|---|---|
| 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 SAIJ40BX140-75
| 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 SAIJ40BX140-75 Is Used
Machine Changeover
Quickly adapt the retract end-position from 65 to 140 mm during product family changeovers without disassembling the pneumatic rig.
Commissioning Calibration
Fine-tune the exact stopping point of a tooling head during initial setup, absorbing mechanical tolerances directly at the rear stopper.
Variable Diverter Stroke
Adjust the pusher travel distance on the fly to accommodate different package sizes moving down a packaging line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-75 the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm unit. The generous 75 mm adjustment range is ideal for product-size changeovers on a line, letting you set a new retract stop on the fly instead of adding external stops. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air, so look to an SAIL or BSAI cylinder for pneumatic locking.
For an exact ISO 15552 replacement, match the 40 mm bore, 140 mm stroke, 75 mm adjustment, PT tapered port threads, and SUS304 rod material. Because the total travel is 140 mm, side-load stress is minimal, but always ensure the load is guided externally for optimal seal life. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX140-75 FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 879 N.
The rear adjuster screw acts as a mechanical stop that shortens the retract stroke. For this model, it allows you to trim the effective travel anywhere within a 65 to 140 mm window. Note that this stopper does not lock the load without continuous air pressure.
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