This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X950S, 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 SI50X950S
The AirTAC Airtac SI50 Standard Cylinder SI50X950S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 950mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X950S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X950S
- 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 SI50X950S
The AirTAC SI50X950S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 950mm stroke, and a G1/4 air port. It delivers 982N of push force at 0.5MPa. The direct replacement is the SAI50X950S, which matches the original ISO 15552 mounting interface, bore, stroke, output force, and porting for a seamless fixture swap.
The SAI upgrade introduces a refined piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI accepts current AirTAC switches. For high-temperature needs, Viton H seals raise the limit to 150C.
Airtac SI50 Standard Cylinder SI50X950S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X950S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X950S |
| Bore size | Ø50 mm |
| Stroke | 950 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 SAI50X950S 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 SAI50X950S 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 SI50X950S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×950 | 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 SI50X950S Is Used
Long-Stroke Diverting
Actuates large diverters or sorting gates across wide conveyor belts using the 950mm travel distance.
Extended-Reach Clamping
Secures oversized workpieces or spans wide machinery gaps where 982N of thrust is sufficient.
Replacing the Airtac SI50 Standard Cylinder SI50X950S with the SAI50X950S
To replace the SI50X950S, order the SAI50X950S and verify your ISO 15552 mounting interface, G1/4 port thread, and M16x1.5 rod-end. The -S suffix indicates a piston magnet, so confirm your sensor choice (legacy CS1-B/DS1-B versus current AirTAC switches). If you need more force than the 982N push at 0.5MPa, step up to the 63mm bore; if less is required, the 40mm bore provides 628N. A plain cylinder does not hold load on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for holding. At 950mm, this long stroke demands external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X950S
- ✓ 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 SI50X950S FAQ
Yes, the AirTAC SI50X950S is discontinued. The direct replacement is the SAI50X950S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 950mm stroke, G1/4 port, and mounting fixtures perfectly.
The G1/4 port bore delivers a push force of 982N and a pull force of 825N at 0.5MPa. At 0.7MPa the push force is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X950S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X950S replacement — usually within 7-8 hours.