This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1230STC, 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 SI50X1230STC
The AirTAC Airtac SI50 Standard Cylinder SI50X1230STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1230STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1230STC
- 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 SI50X1230STC
The AirTAC SI50X1230STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1230mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. As a legacy unit, its direct replacement is the SAI50X1230STC, matching the bore, stroke, force, port, and TC trunnion mount for immediate fixture compatibility.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants the SI lacked. Note this 1230mm unit exceeds the 1200mm standard, requiring made-to-order processing and external guides to prevent rod bending.
Airtac SI50 Standard Cylinder SI50X1230STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1230STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1230STC |
| Bore size | Ø50 mm |
| Stroke | 1230 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 SAI50X1230STC 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 SAI50X1230STC 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 SI50X1230STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1230 | 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 SI50X1230STC Is Used
Long-Stroke Material Transfer
Moves packages between distant conveyor stations using the 1230mm stroke, requiring external guide rails to support the extended rod and prevent binding.
High-Bay Pusher Arm
Actuates a pusher mechanism to divert totes in automated storage systems, utilizing the 982N push force at 0.5 MPa to displace loads safely.
Vertical Lowering Assembly
Lowers components at a controlled 30-800 mm/s speed, relying on a pilot-operated check valve since the air cushion only decelerates near stroke end and cannot hold the load.
Replacing the Airtac SI50 Standard Cylinder SI50X1230STC with the SAI50X1230STC
To replace the SI50X1230STC, order the SAI50X1230STC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 1230mm stroke, G1/4 port (PT/G/NPT), and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 40mm bore yields 628N push @0.5MPa, while a 63mm bore yields 1559N. A plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI variant. Because the 1230mm stroke exceeds the 1200mm standard (made-to-order) and is >=300mm, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1230STC
- ✓ 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 SI50X1230STC FAQ
Yes, the SI50X1230STC is discontinued. The direct replacement is the SAI50X1230STC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1230mm stroke, G1/4 port, TC trunnion mount, and output force.
The 50mm bore uses a G1/4 port. Force ratings are: 982N push and 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, 1767N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The 1230mm stroke is non-standard (exceeding the 1200mm max standard) and operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1230STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1230STC replacement — usually within 7-8 hours.