Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20 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 SAIJ40BX250-20
The AirTAC SAIJ40X250-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 230-250 mm usable travel window, allowing you to dial back the 250 mm nominal stroke by up to 20 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it suits moderate-load positioning tasks.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position, meaning it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20 |
|---|---|
| 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 SAIJ40BX250-20
| 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 SAIJ40BX250-20 Is Used
Machine Changeover
Quickly modify the retract end-stop by up to 20 mm when switching product sizes on a packaging line, avoiding cylinder removal.
End-Position Tuning
Fine-tune the 230-250 mm travel window during machine commissioning to perfect seating forces without adding external mechanical stops.
Assembly Positioning
Provides 628 N of push force at 0.5 MPa for moving and locating medium-weight jigs or workpieces on automated assembly fixtures.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20 the Right Cylinder?
Choose this adjustable-stroke model when you need precise end-position tuning or frequent product changeovers without swapping cylinders or adding external stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N push at 0.5 MPa; if you need more power, a 50 mm bore provides 982 N. For load-holding without continuous air pressure, consider an SAIL or BSAI series cylinder instead of relying on the adjuster.
To match this ISO 15552 cylinder for a replacement, confirm the 40 mm bore, 250 mm stroke, 20 mm adjustment range, PT G1/4 port, and the required mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Since this unit lacks the -S magnet option, it cannot host CMSE or DMSE sensors without modification. With a 250 mm stroke, ensure external guiding is used if the load imposes significant side loads on the 16 mm rod.
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 SAIJ40BX250-20 FAQ
It features a rear adjusting screw that lets you shorten the effective stroke by up to 20 mm, providing a 230-250 mm travel window. The adjuster acts as a mechanical stop for end-position tuning and is not a locking mechanism.
At a 0.5 MPa operating pressure, the SAIJ40X250-20 provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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