This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID80X250S, 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 SID80X250S
The AirTAC Airtac SID Series Double-Rod Cylinder SID80X250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID80X250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAID80X250S
- 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 SID80X250S
The AirTAC SID80X250S is a discontinued double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, meaning push and pull force are equal at 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. It features a 25 mm rod, M20x1.5 rod thread, G3/8 port, and 36 mm adjustable air cushions at each end. The direct replacement is the SAID80X250S, matching the bore, stroke, force, and mounting interface.
The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. A double-rod design prevents rod rotation and lets the back rod carry a sensor cam or drive a second tool. 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; cushions only decelerate, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID80X250S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID80X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID80X250S |
| Bore size | Ø80 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID80X250S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAID80X250S 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 SID80X250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SID80X250S Is Used
Twin-Tool Drive Station
Drives two opposing operations from one piston, utilizing the equal both-ways force to push and pull separate tooling simultaneously without stroke variance.
Anti-Rotation Diverter
Uses the dual-rod architecture to prevent rod rotation during lateral product diversion on a packaging line, ensuring precise mechanical guiding.
Replacing the Airtac SID Series Double-Rod Cylinder SID80X250S with the SAID80X250S
To replace the discontinued SID80X250S, specify the SAID80X250S, which offers a direct ISO 15552 interface match with identical 80 mm bore, 250 mm stroke, G3/8 port, and 25 mm rod. When sizing both ways, verify the equal both-ways force fits your needs: this bore provides 2268 N @0.5 MPa, stepping down to the 50 mm bore (825 N) or up to the 100 mm bore (3681 N) if a different capacity is required. A double-rod cylinder is the right choice when you need anti-rotation stability or must drive two tools from one piston. Mounting options include Basic, FA, LB, and TC brackets. The -S magnet supports legacy CS1-B/DS1-B sensors. For stroke lengths of 300 mm or greater, carefully manage side-load moments to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID80X250S
- ✓ 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 SID80X250S FAQ
Yes, the SID80X250S is discontinued. The direct replacement is the SAID80X250S, which matches the ISO 15552 mounting interface, 80 mm bore, 250 mm stroke, G3/8 port, and equal both-ways force. The SAI family also adds SAIL and BSAI lock variants the SI line lacked.
Because it is a double-rod cylinder, force is equal both ways: 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a G3/8 air port. The air cushions only decelerate the load; they do not hold it on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAID80X250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID80X250S replacement — usually within 7-8 hours.