This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX100S, 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 SI50AX100S
The AirTAC Airtac SI50 Standard Cylinder SI50AX100S 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 SAI50AX100S, 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 → SAI50AX100S
- 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 SI50AX100S
The AirTAC SI50AX100S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke. It delivers 982N push and 825N pull at 0.5MPa, uses a G1/4 port, and features an SUS420J2 stainless steel rod. The direct replacement is the SAI50AX100S, sharing the same ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI upgrade introduces 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 variants the SI lacked. This -S model has a piston magnet for CS1-B/DS1-B switches, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50AX100S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX100S |
| 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 SAI50AX100S 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 SAI50AX100S 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 SI50AX100S
| 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 SI50AX100S Is Used
Stainless Rod Clamping
Ideal for repetitive part clamping in machining cells, utilizing the SUS420J2 stainless rod for corrosion resistance against cutting fluids.
Package Diverting
Provides reliable 100mm stroke actuation for diverting medium-weight packages on packaging lines, offering 982N push at 0.5MPa.
Replacing the Airtac SI50 Standard Cylinder SI50AX100S with the SAI50AX100S
To replace the SI50AX100S, order the SAI50AX100S and confirm the ISO 15552 interface, 50mm bore, 100mm stroke, G1/4 port (PT/G/NPT threads), and mounting accessory. The -A rod is SUS420J2 stainless and the -S magnet works with legacy CS1-B/DS1-B sensors. For sizing both ways: a 40mm bore gives 628N push at 0.5MPa, while a 63mm bore gives 1559N. A plain cylinder drifts without live air, so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The 100mm stroke avoids side-load rod-bending issues, but longer strokes need a guide.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX100S
- ✓ 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 SI50AX100S FAQ
Yes, the SI50AX100S is discontinued. The direct replacement is the SAI50AX100S. It features the same ISO 15552 mounting interface, 50mm bore, 100mm stroke, output force, G1/4 port and mounting, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. The 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX100S replacement — usually within 7-8 hours.