This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX90, 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 SI50AX90
The AirTAC Airtac SI50 Standard Cylinder SI50AX90 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 90mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX90, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX90
- 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 SI50AX90
The AirTAC SI50AX90 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 90mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX90, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The -A code denotes a SUS420J2 stainless piston rod for corrosion resistance.
Airtac SI50 Standard Cylinder SI50AX90 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX90 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX90 |
| Bore size | Ø50 mm |
| Stroke | 90 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 SAI50AX90 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 SAI50AX90 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 SI50AX90
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×90 | 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 SI50AX90 Is Used
Package Diversion
Drives 90mm stroke sorting gates on packaging lines, utilizing the 982 N push force to reliably redirect medium-weight cartons at speed.
Clamp Actuation
Provides repeatable 50 kg vertical clamping on CNC machining fixtures, benefiting from the SUS420J2 stainless rod against coolant splash.
Pallet Stops
Acts as a pneumatic stop on roller conveyors, raising a 90mm barrier to halt pallets safely using the 825 N pull force.
Replacing the Airtac SI50 Standard Cylinder SI50AX90 with the SAI50AX90
To replace the SI50AX90, order the SAI50AX90. Verify your ISO 15552 mounting fixture (LB, FA, TC, etc.), the 90mm stroke, and the G1/4 port (PT/G/NPT thread options). Because this SKU has no -S suffix, it cannot support legacy CS1-B/DS1-B sensors; order the SAI with an S suffix if position sensing is needed. Sizing both ways: a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore yields 1559 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX90
- ✓ 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 SI50AX90 FAQ
Yes, the AirTAC SI50AX90 is discontinued. The direct replacement is the SAI50AX90. It shares the same ISO 15552 mounting interface, 50mm bore, 90mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/4 air port and delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, at 0.9 MPa it is 1767 N, and the theoretical max is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50AX90
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX90 replacement — usually within 7-8 hours.