This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X25S, 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 SID40X25S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X25S
- 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 SID40X25S
The AirTAC SID40X25S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This model is discontinued; the direct replacement is the SAID40X25S, which reuses the same G1/4 port, M12x1.25 rod thread, and 27 mm adjustable cushion. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Because the second rod acts as an anti-rotation guide and can carry a sensor cam, it suits compact 25 mm stroke transfer tasks. The -S suffix means a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; for load holding without live air, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID40X25S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X25S |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID40X25S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAID40X25S 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 SID40X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SID40X25S Is Used
Dual-Tool Transfer
Drives two opposing pick-and-place grippers simultaneously, using the equal both ways force to maintain balanced 25 mm stroke actuation.
Anti-Rotation Indexing
The twin rod design prevents piston rotation during short 25 mm shifts, ensuring precise alignment for indexing small electronic components.
Cam-Driven Sensing
Uses the rear exiting rod to carry a sensor cam, triggering legacy CS1-B/DS1-B switches for exact position confirmation in packaging.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X25S with the SAID40X25S
To replace the discontinued SID40X25S, install the direct replacement SAID40X25S, which matches the ISO 15552 mounting interface, 40 mm bore, 25 mm stroke, and G1/4 port. Size both ways by confirming the 528 N @0.5 MPa equal force is sufficient; if more force is needed, step up to the 50 mm bore. A double-rod design is right when you need anti-rotation resistance or must drive two tools simultaneously. Mounting options include Basic, FA, LB, and TC. The -S magnet enables position sensing. For this 25 mm stroke, side-load bending is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X25S
- ✓ 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 SID40X25S FAQ
Yes, the SID40X25S is discontinued. The direct replacement is the SAID40X25S. It shares the same ISO 15552 interface, 40 mm bore, 25 mm stroke, G1/4 port, and mounting, but adds an upgraded two Y-shaped one-way piston seal.
Force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. Speed is 30-800 mm/s. It uses a G1/4 port, M12x1.25 rod thread, and 27 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X25S replacement — usually within 7-8 hours.