Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75
The AirTAC SAIJ50X250-75 is a double-acting ISO 15552 profile cylinder featuring a 50 mm bore and a 250 mm nominal stroke. A rear-mounted adjusting screw allows you to dial back the effective travel by up to 75 mm, creating a precise 175-250 mm usable window for fine-tuning retract end positions without adding external stops. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it well-suited for moderate-load handling tasks.
This unit is configured with an SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and utilizes PT tapered port threads with a G1/4 connection. The extruded aluminum barrel incorporates sensor grooves on both sides; adding a magnet later allows the use of AirTAC CMSE reed or DMSE electronic solid-state switches. The rear adjuster acts purely as a travel stop to set deceleration and end position, so live air pressure is required to maintain the load.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75 |
|---|---|
| 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 SAIJ50AX250-75
| 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 SAIJ50AX250-75 Is Used
Product Changeover
Quickly re-tune the 175-250 mm retract window during packaging line size changes without replacing the cylinder or adding shims.
Adjustable Diverting
Dial in the exact end position for a diverting gate on a conveyor to accommodate varying package lengths on the fly.
Machine Setup
Fine-tune the tooling end-stop during initial commissioning to find the optimal clamping position before locking down the sequence.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75 the Right Cylinder?
Select this 50 mm bore cylinder when an application requires 982 N of thrust at 0.5 MPa, stepping down from a 63 mm bore (1559 N) if you want a lighter footprint, or up from a 40 mm bore (628 N) when extra force is needed. The 75 mm adjustment range is ideal for machines handling frequent product-size changeovers, allowing operators to reposition the retract end-stop on the fly rather than physically swapping out a fixed-stroke SAI cylinder.
Because the 250 mm stroke is substantial, ensure the piston rod side-loading is controlled with an external guide to prevent premature seal wear. For true load-holding without continuous air pressure, note that the SAIJ adjuster is not a brake; you would need to specify an external rod lock or look at related types like the SAIL or BSAI. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and 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 SAIJ50 Adjustable Cylinder SAIJ50AX250-75 FAQ
At a 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw lets you shorten the 250 mm nominal stroke by up to 75 mm, providing a usable travel range of 175 to 250 mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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