Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10 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 SAIJ40BX250-10
The AirTAC SAIJ40X250-10 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the travel end-point without adding external stops. With a nominal 250 mm stroke and a 10 mm adjustment range, it provides a usable travel window of 240-250 mm. It delivers 879 N of push force at 0.7 MPa, making it well-suited for medium-duty positioning tasks.
This specific configuration includes a SUS304 stainless steel rod (option B) for superior corrosion resistance and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a speed range of 30-800 mm/s and uses adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10 |
|---|---|
| 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 SAIJ40BX250-10
| 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 SAIJ40BX250-10 Is Used
End-Position Tuning
Dial in the exact 240-250 mm travel window during machine commissioning to compensate for mechanical tolerances without swapping cylinders.
Product Changeover
Quickly adjust the retract stop on packaging lines when switching between different product sizes that require slightly different stroke lengths.
Assembly Actuation
Provides reliable 879 N push force at 0.7 MPa for pressing or indexing components, with a SUS304 rod for corrosive factory environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10 the Right Cylinder?
Choose this adjustable-stroke model when your assembly requires precise end-position tuning during commissioning or product changeover, rather than relying on a fixed-stroke SAI cylinder. If your application demands higher force, stepping up to the 50 mm bore yields 1374 N of push force at 0.7 MPa; stepping down to the 32 mm bore provides 563 N.
Because the 250 mm stroke exceeds the 300 mm threshold requiring external guidance, standard mounting is sufficient, though long unsupported loads should always use an external guide. The rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX250-10 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 10 mm from the nominal 250 mm, giving a usable travel window of 240-250 mm. This lets you fine-tune the end position at commissioning without changing the cylinder or adding external stops.
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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Covers non-human-caused product damage.
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