Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-50
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-50 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 SAIJ50AX250-50
The AirTAC SAIJ50X250-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel anywhere within a 200 to 250 mm window. This on-machine adjustability eliminates the need to physically swap cylinders or engineer external hard stops when dialing in final end positions during commissioning. Driven by a 50 mm bore, it provides 982 N of push thrust and 825 N of pull thrust at 0.5 MPa operating pressure.
This specific SKU is configured with a SUS420J2 stainless steel rod for enhanced corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic solid-state switches. It supports a standard mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, and features variable air cushions at both ends to decelerate the piston smoothly.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-50 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-50 |
|---|---|
| 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 SAIJ50AX250-50
| 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 SAIJ50AX250-50 Is Used
Product Size Changeovers
Rapidly reconfigure the retract end-stop within the 200-250 mm travel window to accommodate varying package lengths on a packaging line without changing hardware.
Commissioning End-Tuning
Fine-tune the final retract position during machine setup to perfectly align tooling, using the 50 mm adjustment range instead of adding external stopper blocks.
Mid-Force Positioning
Leverage the 982 N push force at 0.5 MPa to consistently push or eject parts to a dialed-in end position that can be tweaked on the factory floor.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX250-50 the Right Cylinder?
Selecting this 50 mm bore over a smaller 40 mm bore increases your 0.5 MPa push force from 628 N up to 982 N, providing a robust margin for mid-range actuation. Conversely, stepping up to a 63 mm bore would yield 1559 N if your application demands heavier loads. The 50 mm bore uses G1/4 ports and an M16x1.5 rod thread, balancing airflow capacity with structural rigidity.
The 50 mm adjustment range is ideal for machinery requiring frequent product-size changeovers, allowing operators to reposition the retract stop without altering the fixed 250 mm nominal stroke. Because the 250 mm stroke exceeds the 300 mm threshold, it is important to guide the load externally to prevent excessive side-loading on the rod. Remember that the rear adjuster and air cushions act only as travel stops and deceleration devices; they do not hold the load without live air pressure. For secure load-holding, consider the SAIL or BSAI series. When replacing an ISO 15552 cylinder, match the 50 mm bore, 250 mm nominal stroke, 50 mm adjuster, PT port threads, and the specified SUS420J2 rod material.
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 SAIJ50AX250-50 FAQ
At a 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. If you need higher force, stepping up to a 63 mm bore provides 1559 N of push at the same pressure.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 50 mm from the 250 mm nominal length, providing a usable travel window of 200 to 250 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
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