This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50SN, 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 SI50X50SN
The AirTAC SI50 Standard Cylinder SI50X50SN 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 SAI50X50SN, 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 → SAI50X50SN
- 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 SI50X50SN
The AirTAC SI50X50SN is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X50SN direct equivalent. The SAI retains the exact G1/4 port, M16x1.5 rod thread, and 30mm cushion, fitting existing fixtures seamlessly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI50X50SN includes a -S magnet for legacy CS1-B/DS1-B sensors and a -N NBR seal for -20 to +70C.
Airtac SI50 Standard Cylinder SI50X50SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50SN |
| 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 SAI50X50SN 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 SAI50X50SN 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 SI50X50SN
| 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 SI50X50SN Is Used
Clamping Fixtures
Ideal for holding workpieces during machining, utilizing the 982N push force at 0.5MPa for rigid clamping.
Package Diverting
Short 50mm stroke provides rapid actuation for routing small to medium packages on material handling lines.
Gating Mechanisms
Reliable 50mm movement operates sorting gates and stops in automated storage and retrieval environments.
Replacing the Airtac SI50 Standard Cylinder SI50X50SN with the SAI50X50SN
To replace the SI50X50SN, order the SAI50X50SN. Verify the ISO 15552 mounting interface, 50mm bore, 50mm stroke, G1/4 port, NBR seal, and the -S magnet for current AirTAC switches. For higher force, the 63mm bore offers 1559N push at 0.5MPa; for smaller fixtures, the 40mm bore provides 628N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50SN
- ✓ 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 SI50X50SN FAQ
Yes, the SI50X50SN is discontinued. The direct replacement is the SAI50X50SN. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 50mm stroke, 982N force, G1/4 port, and mounting accessories.
The bore is 50mm with a G1/4 port. Force ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X50SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50SN replacement — usually within 7-8 hours.