This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100, 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 SI50X100
The AirTAC Airtac SI50 Standard Cylinder SI50X100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X100
- 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 SI50X100
The AirTAC SI50X100 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X100, retaining identical ISO 15552 mounting dimensions, output force, and travel. This SKU lacks the -S magnet, so it cannot accept a CS1-B/DS1-B sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X100 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100 |
| Bore size | Ø50 mm |
| Stroke | 100 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 SAI50X100 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 SAI50X100 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 SI50X100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×100 | 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 SI50X100 Is Used
Package Diversion
Actuating routing gates on packaging lines where 982N of push force reliably redirects moderate carton weights.
Clamp Actuation
Driving mid-sized holding clamps on machining fixtures, utilizing the 100mm stroke to clear the workpiece.
Replacing the Airtac SI50 Standard Cylinder SI50X100 with the SAI50X100
To replace the SI50X100, order the SAI50X100. Confirm the ISO 15552 interface, 50mm bore, 100mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Because this specific SKU has no -S magnet, it cannot support position sensing; order the -S version if you need switches. The 50mm bore yields 982N push at 0.5MPa; step down to a 40mm bore (628N) or up to a 63mm bore (1559N) to match your actual load. A plain cylinder drifts on air loss, as the cushion only decelerates; use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant to hold a load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100
- ✓ 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 SI50X100 FAQ
Yes, the SI50X100 is discontinued. The direct replacement is the SAI50X100. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 100mm stroke, G1/4 port, and mounting interface.
It uses a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Request a Quote for the SAI50X100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100 replacement — usually within 7-8 hours.