This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X126, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI50 Standard Cylinder SI50X126
The AirTAC Airtac SI50 Standard Cylinder SI50X126 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 126mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X126, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke126 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X126
- 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 SI50 Standard Cylinder SI50X126
The AirTAC SI50X126 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 126mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X126 direct upgrade.
The SAI50X126 retains the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories. It upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure, and introduces SAIL, SAIF and BSAI variants the SI lacked. This no-magnet SKU cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X126 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X126 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X126 |
| Bore size | Ø50 mm |
| Stroke | 126 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X126 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI50X126 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X126
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×126 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI50 Standard Cylinder SI50X126 Is Used
Package Diversion
Actuates routing gates on packaging lines where the 982N push force at 0.5MPa easily deflects standard cartons.
Clamp Actuation
Provides reliable clamping pressure for mid-weight machining fixtures, utilizing the 825N pull force.
Replacing the Airtac SI50 Standard Cylinder SI50X126 with the SAI50X126
To replace the SI50X126, order the SAI50X126. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; if position sensing is needed, select an SAI50X126S. For sizing, the 50mm bore yields 982N push at 0.5MPa; step down to a 40mm bore (628N) for lighter loads or up to 63mm (1559N) for heavier ones. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X126
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X126 FAQ
Yes, the SI50X126 is discontinued. The direct replacement is the SAI50X126. It shares the same ISO 15552 mounting interface, 50mm bore, 126mm stroke, output force, G1/4 port, and mounting accessories, fitting existing fixtures perfectly.
The bore is 50mm with a G1/4 air port. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Request a Quote for the SAI50X126
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X126 replacement — usually within 7-8 hours.