This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX75, 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 SI50AX75
The AirTAC Airtac SI50 Standard Cylinder SI50AX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX75
- 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 SI50AX75
The AirTAC SI50AX75 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. Delivering 982 N push and 825 N pull at 0.5 MPa via a G1/4 port, it is replaced by the SAI50AX75. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S) so cannot take a sensor. For lock needs the SI lacked, explore SAIL or BSAI variants; Viton H seals allow 0-150 C heat.
Airtac SI50 Standard Cylinder SI50AX75 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX75 |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50AX75 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 SAI50AX75 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 SI50AX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50AX75 Is Used
Mid-Force Clamping
Ideal for securing medium workpieces with 982 N of push force at 0.5 MPa during machining or welding operations.
Package Diversion
Provides reliable 75 mm stroke actuation to push or sort items at transfer points without overwhelming the system.
Replacing the Airtac SI50 Standard Cylinder SI50AX75 with the SAI50AX75
To replace this SI50AX75, order the SAI50AX75. Confirm the ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread options) and your specific mounting accessory. Because this specific SKU lacks a magnet, it cannot accept CS1-B/DS1-B sensors. The default carbon steel rod can be swapped for the SUS420J2 (-A) stainless option for corrosion resistance. Sizing both ways: neighbouring bores are 40mm (628 N push @0.5 MPa) and 63mm (1559 N push @0.5 MPa). Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX75
- ✓ 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 SI50AX75 FAQ
Yes, the SI50AX75 is discontinued. The direct replacement is the SAI50AX75. It shares the identical ISO 15552 mounting interface, 50mm bore, 75mm stroke, output force, G1/4 port and mounting accessories, fitting existing fixtures perfectly.
The 50mm bore features a G1/4 port and delivers 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It uses an M16x1.5 rod thread and 30mm cushions.
Request a Quote for the SAI50AX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX75 replacement — usually within 7-8 hours.