This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X252S, 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 SI50X252S
The AirTAC Airtac SI50 Standard Cylinder SI50X252S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 252mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X252S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke252 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X252S
- 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 SI50X252S
The AirTAC SI50X252S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 252mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X252S, matching the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Note that plain cylinders drift on air loss; use a SAIL lock or pilot check valve for holding.
Airtac SI50 Standard Cylinder SI50X252S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X252S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X252S |
| Bore size | Ø50 mm |
| Stroke | 252 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 SAI50X252S 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 SAI50X252S 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 SI50X252S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×252 | 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 SI50X252S Is Used
Package Diversion
Routes medium-weight cartons on packaging lines using the 982 N push force, with the 252mm stroke clearing product lanes.
Pallet Positioning
Indexes empty pallets into loading zones where the 50 kg vertical lift capacity and ISO 15552 mounting ensure stable alignment.
Clamp Actuation
Secures workpieces during machining, relying on the adjustable 30mm air cushions to decelerate the rod smoothly at stroke ends.
Replacing the Airtac SI50 Standard Cylinder SI50X252S with the SAI50X252S
To replace the SI50X252S, order the SAI50X252S. Verify the ISO 15552 mounting interface, 252mm stroke, G1/4 port, and M16x1.5 rod thread. The -S suffix means a magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. If sizing up or down, the 40mm bore yields 628 N push at 0.5 MPa, while the 63mm bore yields 1559 N. For this 252mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. A plain cylinder does not hold load without air; use the SAIL or BSAI lock variant, or an external pilot check valve for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X252S
- ✓ 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 SI50X252S FAQ
Yes, the SI50X252S is discontinued. The direct replacement is the SAI50X252S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 252mm stroke, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X252S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X252S replacement — usually within 7-8 hours.