This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X61, 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 SI50X61
The AirTAC Airtac SI50 Standard Cylinder SI50X61 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 61mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X61, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke61 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X61
- 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 SI50X61
The AirTAC SI50X61 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 61 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, utilizing a G1/4 air port and an M16x1.5 rod thread. AirTAC replaced this legacy unit with the SAI50X61, a direct upgrade retaining the exact ISO 15552 mounting interface, output force, and port size.
The SAI50X61 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks the -S magnet, meaning it cannot accept a CS1-B or DS1-B sensor. If high temperatures are expected, Viton H seals raise the operating range to 150 C.
Airtac SI50 Standard Cylinder SI50X61 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X61 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X61 |
| Bore size | Ø50 mm |
| Stroke | 61 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 SAI50X61 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 SAI50X61 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 SI50X61
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×61 | 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 SI50X61 Is Used
Mid-Force Clamping
Applies 982 N of push force at 0.5 MPa to secure medium-sized workpieces during machining operations.
Package Diverting
Uses the 61 mm stroke to push cartons smoothly between adjacent conveyor lanes at up to 800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50X61 with the SAI50X61
To replace the discontinued SI50X61, order the SAI50X61. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G, or NPT), and the 61 mm stroke. Because this SKU has no -S magnet, it cannot support position sensing; if switches are needed, select an SAI50X61S and use current AirTAC sensors. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while the neighbouring 63 mm bore offers 1559 N. Note that a plain cylinder drifts on air loss; for load holding, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X61
- ✓ 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 SI50X61 FAQ
Yes, the AirTAC SI50X61 is discontinued. The direct replacement is the SAI50X61. It shares the same ISO 15552 mounting interface, 50 mm bore, 61 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 air port. It provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X61
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X61 replacement — usually within 7-8 hours.