This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1270S, 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 SI50X1270S
The AirTAC SI50 Standard Cylinder SI50X1270S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1270mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1270S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1270S
- 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 SI50X1270S
The AirTAC SI50X1270S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1270mm stroke. Delivering 982 N push at 0.5 MPa, it is replaced by the SAI50X1270S. This direct successor matches the G1/4 port, M16x1.5 thread, and mounting interface. Stroke 1270mm exceeds the 1200mm standard, making it a non-standard order. The SAI upgrades the piston seal to two Y-shaped elements for low start-up pressure, and adds SAIL, SAIF, and BSAI variants the SI lacked.
The -S magnet works with legacy CS1-B/DS1-B sensors. The cushion only decelerates; use SAIL or an external valve to hold loads.
Airtac SI50 Standard Cylinder SI50X1270S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1270S |
| Bore size | Ø50 mm |
| Stroke | 1270 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 SAI50X1270S 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 SAI50X1270S 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 SI50X1270S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1270 | 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 SI50X1270S Is Used
Extended Reach Transfer
Pushes items across wide conveyor gaps using the 1270mm stroke, yielding 982 N push at 0.5 MPa for reliable mid-route diversion.
High Bay Extraction
Extracts totes from deep racking. The 50 kg vertical lift capacity handles packed goods, but requires external guides for the long rod.
Long Press Lowering
Lowers heavy platens over 1270mm. The 30mm adjustable cushion decelerates the load, while a pilot check valve prevents drifting.
Replacing the Airtac SI50 Standard Cylinder SI50X1270S with the SAI50X1270S
To replace the SI50X1270S, order the SAI50X1270S direct, confirming the ISO 15552 interface, 50mm bore, 1270mm non-standard stroke, G1/4 port, and -S magnet. The SAI accepts current AirTAC switches. For sizing, the 50mm bore yields 982 N push at 0.5 MPa; dropping to a 40mm bore gives 628 N, while a 63mm bore offers 1559 N. Because 1270mm exceeds the 1200mm standard max, it is made-to-order; at this length, use external guides to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use the SAIL lock variant, BSAI clamp-lock, or a pilot check valve. Rod materials include carbon steel, SUS420J2 (A), or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1270S
- ✓ 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 SI50X1270S FAQ
Yes, the SI50X1270S is discontinued. The direct replacement is the SAI50X1270S. It shares the same ISO 15552 mounting interface, 50mm bore, 1270mm stroke, G1/4 port, and output force, fitting existing fixtures directly.
The G1/4 port bore delivers 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 30mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1270S replacement — usually within 7-8 hours.