This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X25S, 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 SID50X25S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X25S
- 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 SID50X25S
The AirTAC SID50X25S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This SID model is discontinued; the direct replacement is the SAID50X25S, matching the 50mm bore, 25mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family uses an upgraded two Y-shaped one-way piston seal for low start-up pressure and long life.
Because the second rod can carry a sensor cam or drive two tools simultaneously while resisting rotation, the double-rod design adds mechanical stability. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder does not hold loads on air loss; the 30mm adjustable cushions only decelerate near stroke end, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID50X25S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X25S |
| Bore size | Ø50 mm |
| Stroke | 25 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 SAID50X25S 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 SAID50X25S 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 SID50X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SID50X25S Is Used
Dual-Tool Synchronized Driving
Drives two separate work operations simultaneously from one piston, utilizing the equal push and pull force on both rod ends for balanced actuation.
Anti-Rotation Guiding
The twin-rod architecture prevents piston rotation without external guides, ensuring precise linear positioning for tight-tolerance assembly tasks.
Cam-Driven Sensing
Uses the rear exiting rod to carry a sensor cam, allowing legacy CS1-B/DS1-B switches to detect position while the front rod performs work.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X25S with the SAID50X25S
To replace the discontinued SID50X25S, specify the SAID50X25S, which reuses the exact ISO 15552 mounting interface and G1/4 port. Size both ways by confirming the equal push/pull force meets your requirement; if you need less force, step down to the 40mm bore (528 N @0.5 MPa), or step up to the 63mm bore (1402 N @0.5 MPa) for more. A double rod is right when you need anti-rotation stability, a back rod to carry a sensor cam, or to drive two tools. Mounting options include Basic, FA, LB, and TC. Retain the -S suffix for the piston magnet. For this 25mm stroke, side-load concerns are minimal, but for strokes >=300mm ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X25S
- ✓ 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 SID50X25S FAQ
Yes, the SID50X25S is discontinued. The direct replacement is the SAID50X25S, offering the same ISO 15552 interface, 50mm bore, 25mm stroke, G1/4 port, and equal both ways force.
Force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Speed is 30-800 mm/s. It features a G1/4 port, 20mm rod, and 30mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X25S replacement — usually within 7-8 hours.