This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X25S, 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 SID125X25S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X25S
- 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 SID125X25S
The AirTAC SID125X25S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making the push and pull force equal 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 SAID125X25S, which reuses the same ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread. The SAI family upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Because both faces use the rod-side area, the back rod can carry a sensor cam to drive two tools without robbing the primary stroke. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder drifts on air loss, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID125X25S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X25S |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAID125X25S 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 SAID125X25S 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 SID125X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SID125X25S Is Used
Multi-Spindle Drilling
Drives two opposing machining spindles simultaneously using both rod ends, ensuring perfectly synchronized feed rates while maintaining equal force in both directions.
Transfer Pusher
Transfers heavy pallets on a conveyor line where the extended back rod operates a legacy CS1-B/DS1-B sensor cam, confirming stroke completion without external brackets.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X25S with the SAID125X25S
To replace the discontinued SID125X25S, install the SAID125X25S directly; it matches the 125 mm bore, 25 mm stroke, G1/2 port, and FA/LB/TC mountings without altering the ISO 15552 footprint. Size both directions by checking the equal-both-ways force: if 5734 N @0.5 MPa is insufficient, step up to the 160 mm bore, or drop to 100 mm if lower force is needed. A double rod is correct when you need anti-rotation stability or a rear rod to mount a sensor cam. The -S magnet enables position sensing. For any stroke >=300 mm, verify the side-load rating to prevent guide failure. Remember, air cushions only decelerate; they do not hold loads without live air.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X25S
- ✓ 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 SID125X25S FAQ
Yes, the SID125X25S is discontinued. The direct replacement is the SAID125X25S. It shares the same ISO 15552 interface, 125 mm bore, 25 mm stroke, G1/2 port, and mounting options, while adding an upgraded Y-shaped piston seal.
Force is equal both ways due to the double-rod design: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The operating speed is 30-500 mm/s. It features a 32 mm rod, M27x2 thread, and 40 mm adjustable air cushions at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X25S replacement — usually within 7-8 hours.