Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100 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 SAIJ40BX250-100
The AirTAC SAIJ40X250-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to dial back the 250 mm nominal stroke by up to 100 mm. This creates a precise 150 to 250 mm usable travel window, enabling exact end-position tuning at commissioning without swapping the barrel or adding external stops. It delivers 879 N of push force and 528 N of pull force at 0.7 MPa.
Built with a SUS304 stainless steel rod and PT tapered ports, this unit is tailored for environments demanding superior corrosion resistance and secure fluid sealing. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts strictly as a mechanical stop for deceleration alongside the variable air cushions, so it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100 |
|---|---|
| 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 SAIJ40BX250-100
| 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 SAIJ40BX250-100 Is Used
Machine Changeovers
Rapidly adapt the retract end-position across a 150-250 mm window when switching product sizes on a packaging line without changing hardware.
End-Position Tuning
Fine-tune the exact retract distance during commissioning to perfect part ejection or forming depth without adding external stopper blocks.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in washdown or chemical environments where standard carbon steel rods would fail.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100 the Right Cylinder?
Choose this 40 mm bore when an application requires 879 N of thrust at 0.7 MPa but demands a highly flexible end-of-stroke position. The 100 mm adjustment range is ideal for product-size changeovers on a packaging line, replacing the need to bolt on custom external stops. If your process requires less force, the 32 mm bore offers 563 N at 0.7 MPa; if you need more power, the 50 mm bore provides 1374 N.
For load-holding without continuous air pressure, pair this cylinder with an external pilot-operated check valve or select the AirTAC SAIL or BSAI series instead. Because this 250 mm stroke extends beyond 200 mm total travel, ensure you provide an external guide to prevent excessive side loading on the 16 mm rod and M12x1.25 thread. To match this ISO 15552 replacement: specify 40 mm bore, 250 mm stroke, 100 mm adjust, PT ports, SUS304 (B) rod, no magnet, and mounting from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ40BX250-100 FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can achieve up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the 250 mm nominal stroke by up to 100 mm, providing an adjustable travel window of 150 to 250 mm. This stopper only sets the travel end and does not lock or hold the load without live air pressure.
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