Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S
The AirTAC SAIJ50X250-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, allowing you to dial back the 250mm nominal stroke by up to 40mm. This creates a precise 210-250mm usable travel window for fine-tuning end positions during commissioning without adding external stops. It delivers a robust 982N push force at 0.5MPa and includes a magnetic piston for position sensing.
This SKU is equipped with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance over standard carbon steel. The barrel is an extruded aluminum profile with sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses a G1/4 port and offers adjustable air cushions at both ends to manage deceleration.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | 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 SAIJ50 Adjustable Cylinder SAIJ50AX250-40S Is Used
Product Changeover
Dial in the 210-250mm travel window during format changes on a packaging line, allowing rapid adaptation to different carton sizes without swapping hardware.
End-Stop Calibration
Fine-tune the retract position during machine commissioning to achieve exact clamping or pressing depths, preventing part damage through precise physical stops.
Variable Diverter
Adjust the stroke on a conveyor sorting arm to accommodate different package profiles on the fly, ensuring accurate routing without reprogramming the motion controller.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-40S the Right Cylinder?
Choose this 50mm bore when an application requires 982N of push force at 0.5MPa, or 1374N at 0.7MPa. If your process needs less force, stepping down to a 40mm bore yields 628N at 0.5MPa; if more clamping power is needed, a 63mm bore provides 1559N. The adjustable stroke is ideal for machine changeovers where the exact end-of-travel point varies by product size, unlike a fixed-stroke SAI cylinder.
Because the 250mm stroke is 50mm or more below the 1200mm maximum standard stroke for this bore, side-load risks are moderate, but an external guide is still recommended for heavy lateral loads. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider an SAIL or BSAI cylinder. This model is dimensionally interchangeable per ISO 15552 and uses PT tapered port threads.
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 SAIJ50 Adjustable Cylinder SAIJ50AX250-40S FAQ
At 0.5MPa operating pressure, this 50mm bore cylinder provides 982N of push force and 825N of pull force. At 0.7MPa, the push force increases to 1374N.
A rear adjusting screw lets you shorten the effective travel from the 250mm nominal stroke by up to 40mm, creating a 210-250mm usable window. This allows you to set the exact end position at commissioning without replacing the cylinder.
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