Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75S 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 SAIJ50AX250-75S
The AirTAC SAIJ50X250-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 250 mm nominal stroke to a minimum of 175 mm. This 75 mm adjustment window is ideal for dialing in exact end positions during machine commissioning or product changeovers without physically swapping the cylinder. In the 50 mm bore class, it provides 982 N of push force and 825 N of pull force at 0.5 MPa, operating reliably at speeds between 30 and 800 mm/s.
This variant features an SUS420J2 stainless steel rod for superior corrosion resistance and includes a magnet for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options available on some other series.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75S |
|---|---|
| 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 SAIJ50AX250-75S
| 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 SAIJ50AX250-75S Is Used
Product Changeover
Dial in the 175-250 mm travel window on the fly to accommodate different package sizes on a packaging line without changing out the cylinder.
Machine Setup
Fine-tune the exact end-stop position during initial commissioning to achieve perfect alignment without adding external mechanical stops.
Variable Diverter
Adjust the retract stroke length on a sorting conveyor diverter to handle varying product profiles and ensure accurate routing.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-75S the Right Cylinder?
Choose this 50 mm bore adjustable-stroke model when your application requires precise end-position tuning within a 175 to 250 mm travel window. If your process requires less force, stepping down to a 40 mm bore yields 628 N of push force at 0.5 MPa. If you need more clamping power, stepping up to a 63 mm bore provides 1559 N of push force. Because the stroke is 250 mm, an external guide is recommended to prevent excessive side loading on the 20 mm rod and M16x1.5 rod thread.
Select this SAIJ variant over a fixed-stroke SAI cylinder when your setup requires variable end-stops for product size changes. Remember that the rear adjuster acts purely as a mechanical stop to set deceleration and end-position; it does not hold the load without live air pressure. For true load-holding without continuous air, consider an external rod lock, a pilot-operated check valve, or AirTAC SAIL and BSAI series cylinders. This model is dimensionally interchangeable per ISO 15552 and uses a PT tapered G1/4 port.
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 SAIJ50AX250-75S FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 75 mm. This gives the cylinder a usable travel window of 175 to 250 mm, letting you set the exact end position at commissioning without replacing the cylinder.
At 0.5 MPa operating pressure, this cylinder provides 982 N of push force and 825 N of pull force. It can achieve a maximum push force of 1767 N at 0.9 MPa.
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