This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X50S, 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 SID Series Double-Rod Cylinder SID125X50S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X50S
- 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 SID Series Double-Rod Cylinder SID125X50S
The AirTAC SID125X50S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. This model is discontinued; the direct replacement is the SAID125X50S, which shares the G1/2 port, M27x2 rod thread, and 40mm adjustable cushion. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Because both faces use the rod-side area, the design prevents rod rotation and allows the back rod to carry a sensor cam. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate near stroke end; an external rod lock or SAIL/BSAI variant is required to hold loads on air loss.
Airtac SID Series Double-Rod Cylinder SID125X50S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X50S |
| Bore size | Ø125 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID125X50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAID125X50S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID125X50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SID Series Double-Rod Cylinder SID125X50S Is Used
Dual-Tool Drive Station
Simultaneously actuates two opposing machining heads using both rod ends, maintaining perfectly synchronized equal force.
Anti-Rotation Divert Gate
Uses the twin-rod architecture to prevent platform twist during high-speed package diverting on a sorting line.
Symmetric Lift Platform
Drives a balanced lifting surface where the equal push and pull force prevents sagging during vertical transfer.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X50S with the SAID125X50S
To replace the discontinued SID125X50S, install the direct replacement SAID125X50S, which matches the ISO 15552 interface, 125mm bore, 50mm stroke, and G1/2 port. Size both ways by verifying the equal force requirement against neighbouring bores, ensuring the 5734 N @0.5 MPa output fits your system. A double rod is right when you need anti-rotation stability or want to drive two tools simultaneously. Reuse FA, LB, or TC mounting hardware directly. The -S magnet enables position sensing. For stroke lengths >=300mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X50S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID125X50S FAQ
Yes, the SID125X50S is discontinued. The direct replacement is the SAID125X50S, offering the same ISO 15552 mounting, 50mm stroke, and equal force.
Force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The bore dictates a G1/2 air port, M27x2 rod thread, and 30-500 mm/s speed range.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X50S replacement — usually within 7-8 hours.