Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40S 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 SAIJ40BX250-40S
The AirTAC SAIJ40X250-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879N of push force at 0.7 MPa and features a 250mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 210-250mm usable travel window for commissioning.
This variant includes a SUS304 stainless steel rod for superior corrosion resistance and a built-in magnet for CMSE or DMSE sensors. The extruded aluminum barrel omits the FB, CA, CB, and CR mounts, utilizing a reduced ISO 15552 mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) to simplify machine integration.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40S |
|---|---|
| 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 SAIJ40BX250-40S
| 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 SAIJ40BX250-40S Is Used
Product Changeovers
Dial in the 210-250mm travel window during format changes without physically swapping the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract end-stop during machine commissioning to achieve exact positioning without altering your pneumatic plumbing.
Variable Stops
Adjust the stroke on the fly for diverter arms or pushers handling different package sizes on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40S the Right Cylinder?
Choose this 40mm bore when you need more power than the 32mm version (563N push at 0.7 MPa) but want a smaller footprint than the 50mm option (1374N). The adjustable stroke is ideal for product changeovers, allowing you to dial in the 210-250mm end position without swapping cylinders or adding external stops.
Because the stroke is 250mm, ensure adequate external guiding to prevent side-loading damage to the M12x1.25 rod thread. To replace this cylinder, match the 40mm bore, 250mm stroke, -40mm adjustment, PT tapered ports, and -S magnet. Note that the rear adjuster is a travel stop, not a lock; for load-holding without live air, use an external rod lock or a SAIL cylinder.
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 SAIJ40BX250-40S FAQ
At 0.7 MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 738N of pull force. It can reach a maximum push force of 1130N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 250mm nominal stroke by up to 40mm. This provides a usable travel window of 210-250mm for precise end-position tuning without replacing the cylinder.
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