This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75N, 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 SI50X75N
The AirTAC Airtac SI50 Standard Cylinder SI50X75N 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 SAI50X75N, 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 → SAI50X75N
- 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 SI50X75N
The AirTAC SI50X75N is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X75N, a direct sharing the exact mounting interface, bore, stroke, force, and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this SKU lacks the -S magnet, it cannot accept a sensor. The NBR seal supports -20 to +70C, though Viton H extends this to 150C.
Airtac SI50 Standard Cylinder SI50X75N Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75N |
| 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 SAI50X75N 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 SAI50X75N 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 SI50X75N
| 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 SI50X75N Is Used
Package Diverting
Ideal for pushing cartons on a line, using the 982N force to actuate routing gates at high cycling speeds.
Light Pressing
Provides consistent downward pressure for seating components or light stamping tasks within a 75mm travel.
Replacing the Airtac SI50 Standard Cylinder SI50X75N with the SAI50X75N
To replace the SI50X75N, order the SAI50X75N. Confirm the ISO 15552 mounting interface, G1/4 port, and your NBR seal choice. Since this SKU lacks a magnet, it cannot take a switch; if sensing is needed, select an SAI50X75NS. The 50mm bore yields 982N push at 0.5MPa; step down to a 40mm bore for 628N, or up to 63mm for 1559N. Note that a plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 75mm stroke, side-load risks are minimal, but always guide the rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75N
- ✓ 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 SI50X75N FAQ
Yes, the SI50X75N is discontinued. The direct replacement is the SAI50X75N. It shares the identical ISO 15552 mounting interface, 50mm bore, 75mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
The G1/4 port supplies 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Request a Quote for the SAI50X75N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75N replacement — usually within 7-8 hours.