This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is SAI50X25S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the SAI50X25S in place of this model. 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 SI50X25S
The AirTAC Airtac SI50 Standard Cylinder SI50X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAI50X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X25S
About the Airtac SI50 Standard Cylinder SI50X25S
The AirTAC SI50X25S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 25mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X25S. This current-production drop-in maintains the exact ISO 15552 mounting interface, bore, stroke, output force, and port size to fit existing fixtures seamlessly.
The SAI upgrade features a redesigned piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For your 50mm bore, the safe working load is roughly 589N (about 60% of the 982N push force), translating to a vertical lift capacity of approximately 50kg with a 2:1 safety margin. The SI50X25S includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock and valve variants the original SI lacked.
Airtac SI50 Standard Cylinder SI50X25S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X25S |
| Bore size | Ø50 mm |
| Stroke | 25 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 SAI50X25S 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 SAI50X25S produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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 SI50X25S Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using the 982N push force to secure components firmly within a compact 25mm travel envelope.
Package Diverting
Provides rapid actuation for sorting or diverting light packages on a conveyor line, operating efficiently at 30-800 mm/s.
Ejector Mechanisms
Delivers a fast, reliable punch to eject finished parts from a press or mold, taking advantage of the short stroke and 50kg vertical lift margin.
Replacing the Airtac SI50 Standard Cylinder SI50X25S with the SAI50X25S
To replace the discontinued SI50X25S, order the SAI50X25S and verify your ISO 15552 mounting interface, G1/4 port thread (PT/G/NPT), and M16x1.5 rod-end connection. Because this is a short 25mm stroke, you can easily size up to the 63mm bore (1402N pull at 0.5MPa) if your fixture allows, or down to a 40mm bore (528N pull) for lighter loads. The built-in magnet (-S) supports CS1-B/DS1-B switches. Remember that a standard cylinder drifts without live air; the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X25S
- ✓ 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 SI50X25S FAQ
Yes, the SI50X25S is discontinued. The exact drop-in replacement is the AirTAC SAI50X25S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 25mm stroke, 982N force, G1/4 port, and mounting accessories, so it fits existing fixtures perfectly.
The 50mm bore features a G1/4 air port and an M16x1.5 rod thread. At 0.5 MPa it provides 982N push and 825N pull force. At 0.7 MPa push is 1374N, and at 0.9 MPa it is 1767N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X25S replacement — usually within 7-8 hours.