This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X250TC, 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 SI50X250TC
The AirTAC SI50 Standard Cylinder SI50X250TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X250TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X250TC
- 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 SI50X250TC
The AirTAC SI50X250TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 250mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X250TC, retaining the same TC trunnion mount, interface, and output.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. Note this SKU lacks a magnet, so it cannot take a sensor; legacy CS1-B/DS1-B switches only fit the -S version.
Airtac SI50 Standard Cylinder SI50X250TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X250TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X250TC |
| Bore size | Ø50 mm |
| Stroke | 250 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 SAI50X250TC 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 SAI50X250TC 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 SI50X250TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SI50X250TC Is Used
Package Diverting
Ideal for actuating routing gates on 50mm belt conveyors, using the 250mm stroke to shift parcels between sorting lanes smoothly.
Pallet Stopping
Deploys a 250mm stop blade on roller tracks to halt pallets, leveraging the 982N push force to absorb incoming momentum securely.
Light Press Lowering
Lowers compact assembly tooling or light press heads, where the TC trunnion mount accommodates the slight articulation during the downstroke.
Replacing the Airtac SI50 Standard Cylinder SI50X250TC with the SAI50X250TC
To replace the SI50X250TC, order the SAI50X250TC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 250mm stroke, G1/4 port, and thread type (PT/G/NPT). Because this specific SKU has no -S magnet, it cannot accept a position sensor. For sizing, the 50mm bore yields 982N push at 0.5MPa; dropping to a 40mm bore gives 628N, while a 63mm bore provides 1559N. At 250mm stroke, guide the load to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X250TC
- ✓ 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 SI50X250TC FAQ
Yes, the SI50X250TC is discontinued. The direct replacement is the SAI50X250TC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 250mm stroke, G1/4 port, TC mount, and force ratings.
The 50mm bore uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200 kgf at 1.0 MPa. The rod is Ø20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X250TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X250TC replacement — usually within 7-8 hours.