This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX80, 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 SI50AX80
The AirTAC Airtac SI50 Standard Cylinder SI50AX80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX80
- 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 SI50AX80
The AirTAC SI50AX80 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI50AX80. This direct upgrade keeps the exact ISO 15552 mounting interface, bore, and force.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a sensor; the -A rod is SUS420J2 stainless steel.
Airtac SI50 Standard Cylinder SI50AX80 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX80 |
| Bore size | Ø50 mm |
| Stroke | 80 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 SAI50AX80 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 SAI50AX80 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 SI50AX80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SI50AX80 Is Used
Package Diverting
Actuates diverter arms on packaging lines, using the 982 N push force to redirect cartons reliably at speed.
Clamp Actuation
Provides repeatable clamping pressure for mid-weight machining fixtures, benefiting from the 30 mm adjustable cushion.
Gate Control
Operates gravity-feed chute gates in material handling, where the SUS420J2 stainless rod resists humidity.
Replacing the Airtac SI50 Standard Cylinder SI50AX80 with the SAI50AX80
To replace the SI50AX80, order the SAI50AX80. Confirm the ISO 15552 mounting interface, 50 mm bore, 80 mm stroke, G1/4 port (PT/G/NPT thread options), and your specific mounting accessory. This SKU has no magnet and cannot accept a CS1-B/DS1-B sensor; if sensing is needed, order an -S variant. The -A code specifies the SUS420J2 stainless steel piston rod for corrosion resistance instead of the default carbon steel. If sizing up or down, neighbouring bores are 40 mm (628 N [email protected]) and 63 mm (1559 N [email protected]). A plain cylinder drifts on air loss; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX80
- ✓ 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 SI50AX80 FAQ
Yes, the SI50AX80 is discontinued. The direct replacement is the SAI50AX80. It shares the same ISO 15552 mounting interface, 50 mm bore, 80 mm stroke, 982 N force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port feeds a 50 mm bore that yields 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30 mm adjustable air cushion.
Request a Quote for the SAI50AX80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX80 replacement — usually within 7-8 hours.