This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X250SH, 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 SI50X250SH
The AirTAC SI50 Standard Cylinder SI50X250SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X250SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X250SH
- 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 SI50X250SH
The AirTAC SI50X250SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 250mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is directly replaced by the SAI50X250SH. This direct upgrade shares identical mounting, force, and port dimensions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The H suffix indicates a Viton seal for 0-150C high-temp environments, and the S magnet pairs with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X250SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X250SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X250SH |
| 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X250SH 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 SAI50X250SH 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 SI50X250SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SI50X250SH Is Used
Hot Product Diverting
Uses the 250mm stroke and high-temp Viton H seal to push heated molded parts off a conveyor belt without seal degradation.
Mid-Force Actuation
Provides 982N of push force at 0.5MPa for moving medium-weight jigs and tooling plates on automated machining lines.
Pallet Stopper Gate
Acts as a pneumatic stop gate in packaging zones, cycling safely within the 30-800mm/s speed range of this 50mm bore.
Replacing the Airtac SI50 Standard Cylinder SI50X250SH with the SAI50X250SH
To replace the SI50X250SH, order the SAI50X250SH. Confirm the ISO 15552 mounting interface, 50mm bore, 250mm stroke, G1/4 port, and your specific mounting accessory. The S suffix provides a piston magnet for CS1-B/DS1-B switches, while the H suffix denotes the high-temperature Viton seal. If you need more force, the 63mm bore offers 1559N at 0.5MPa; if less is required, the 40mm bore provides 628N. At 250mm stroke, guide rods are recommended to prevent rod bending under side loads. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X250SH
- ✓ 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 SI50X250SH FAQ
Yes, the AirTAC SI50X250SH is discontinued. The direct replacement is the SAI50X250SH. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 250mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder uses a G1/4 air port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X250SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X250SH replacement — usually within 7-8 hours.