This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X25, 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 SID50X25
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X25 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 SAID50X25, 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 → SAID50X25
- 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 SID50X25
The AirTAC SID50X25 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force is equal both ways at 825 N @0.5 MPa. This SKU has no -S magnet and cannot carry a sensor. The SID50X25 is discontinued and the direct replacement is the SAID50X25, retaining the G1/4 port, M16x1.5 thread, and 30 mm cushion. The SAI family upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Because the effective area is identical on both faces, this bore delivers 825 N @0.5, 1154 N @0.7, and 1484 N @0.9 MPa. Note that a plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock or the SAIL/BSAI lock variant for held loads.
Airtac SID Series Double-Rod Cylinder SID50X25 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X25 |
| 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 SAID50X25 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 SAID50X25 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 SID50X25
| 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 SID50X25 Is Used
Twin-Tool Synchronization
Drives two opposing tooling heads simultaneously from a single piston, utilizing the equal both-ways force to ensure perfectly synchronized machining or forming operations.
Symmetrical Transfer Arm
Powers a transfer mechanism that pushes a part forward on the extend stroke and retracts a second fixture on the return stroke, cutting cycle time by performing two equal-force tasks.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X25 with the SAID50X25
To replace the discontinued SID50X25, install the direct replacement SAID50X25, which matches the ISO 15552 interface, 50 mm bore, 25 mm stroke, and G1/4 port. Size both ways by confirming the 825 N @0.5 MPa equal force is sufficient, or step to the 63 mm bore (1402 N) if more thrust is needed. A double rod is right when you need anti-rotation stability or want to drive two tools from one piston. Mounting options include FA, LB, and TC brackets. Because this is a non-magnetic SKU, it cannot use sensors. Since the stroke is under 300 mm, side-load alignment is less critical than on longer strokes.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X25
- ✓ 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 SID50X25 FAQ
Yes, the SID50X25 is discontinued. The direct replacement is the SAID50X25, which uses the same ISO 15552 mounting interface, bore, stroke, and G1/4 port. The SAI upgrade also features an improved two-piece Y-shaped piston seal for lower start-up pressure.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4, the rod thread is M16x1.5, and it has a 30 mm adjustable cushion at each end.
Request a Quote for the SAID50X25
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X25 replacement — usually within 7-8 hours.