This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50, 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 SI50X50
The AirTAC Airtac SI50 Standard Cylinder SI50X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X50
- 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 SI50X50
The AirTAC SI50X50 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X50, matching the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X50 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50 |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50X50 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 SAI50X50 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 SI50X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50X50 Is Used
Clamp Actuation
Provides 982N of clamping thrust at 0.5MPa for securing mid-weight workpieces during machining operations.
Package Diverting
Drives 50mm stroke diverting arms to redirect moderate loads on packaging lines at speeds up to 800mm/s.
Gating Mechanisms
Operates 50mm stroke sorting gates and stops in material handling systems requiring a compact ISO 15552 footprint.
Replacing the Airtac SI50 Standard Cylinder SI50X50 with the SAI50X50
To replace the SI50X50, order the SAI50X50. Confirm the ISO 15552 mounting interface, 50mm stroke, G1/4 port, and your mounting accessory (LB, FA, TC, etc.). Because this SKU lacks a magnet, you cannot mount position sensors; order an SAI50X50S if sensing is required. If you need more force, the 63mm bore yields 1559N push at 0.5MPa; if less is acceptable, the 40mm bore yields 628N. The air cushion only decelerates the load; it does not hold position on air loss. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50
- ✓ 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 SI50X50 FAQ
Yes, the SI50X50 is discontinued. The direct replacement is the SAI50X50. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 50mm stroke, output force, G1/4 port, and mounting accessories.
The G1/4 port feeds a 50mm bore that generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Request a Quote for the SAI50X50
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50 replacement — usually within 7-8 hours.