Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S
The AirTAC SAIJ40X250-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 250 mm nominal stroke that can be dialed back by up to 75 mm, providing a versatile 175-250 mm usable travel window for precise end-position tuning.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE or DMSE sensors. It uses PT tapered ports (G1/4) and offers a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) that omits FB, CA, CB, and CR brackets. The rear adjuster acts purely as a mechanical stop to set the retract position, meaning it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAIJ40BX250-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAIJ40BX250-75S Is Used
Product Changeovers
Dial in the 175-250 mm travel window during line format changes to accommodate different package lengths without physically swapping the actuator.
Machine Setup
Fine-tune the final retract position at commissioning using the rear stopper, avoiding the need to machine custom spacer plates or add external stops.
Variable End Stops
Adjust the effective stroke dynamically for multi-model production runs where the exact end-of-stroke position must be altered between cycles.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75S the Right Cylinder?
Choose this 40 mm bore when an application requires a 175-250 mm stroke window and approximately 628N of thrust at 0.5 MPa. You would step down to a 32 mm bore (402N push) for lighter loads, or up to a 50 mm bore (982N push) if you need greater force. The adjustable stroke is ideal for machine changeovers, letting you fine-tune the retract end without swapping cylinders or adding external stops.
Because the nominal stroke is 250 mm, the 16 mm rod and M12x1.25 thread should be guided externally to prevent excessive side-loading on the seals. To replace an ISO 15552 cylinder, match the 40 mm bore, 250 mm stroke, 75 mm adjustment, PT ports, and the -S magnet requirement. For load-holding without live pressure, 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 SAIJ40BX250-75S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 75 mm. This turns the 250 mm nominal stroke into a 175-250 mm usable window, letting you set the exact retract end-position without changing the cylinder's physical mounting.
At 0.5 MPa operating pressure, the 40 mm bore provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf of thrust.
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