This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X300, 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 SID40X300
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X300 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X300, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X300
- 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 SID40X300
The AirTAC SID40X300 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This SKU has no -S magnet and cannot take a sensor. The bore is 40 mm, the port is G1/4, and the rod thread is M12x1.25. This SID model is discontinued; the direct replacement is the SAID40X300, sharing the same ISO 15552 mounting interface, bore, stroke, and equal force.
The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The double-rod design provides anti-rotation stability and lets the back rod carry a sensor cam or drive two tools. A plain cylinder does not hold loads on air loss; the 27 mm adjustable air cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID40X300 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X300 |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAID40X300 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 SAID40X300 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 SID40X300
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SID40X300 Is Used
Dual-Tool Machining Station
Drives two opposing tools simultaneously from a single piston, utilizing the equal both ways 739 N @0.7 MPa force for synchronized material removal.
Anti-Rotation Transfer Gate
Uses the twin-rod architecture to prevent mechanical twist during lateral product diversion on a 40 mm bore packaging line.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X300 with the SAID40X300
To replace the discontinued SID40X300, use the SAID40X300 direct, matching the 40 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting. Size both ways using the equal force: 528 N @0.5 MPa, 739 N @0.7 MPa, 950 N @0.9 MPa. If you need more force, step up to the 50 mm bore; if less, drop to the 32 mm bore. A double rod is right when you need anti-rotation resistance or a back rod to drive a second tool. Mounting options include Basic, FA, LB, and TC. This non-magnetic SKU cannot take a switch; for sensing, select an -S magnet model. At 300 mm stroke, add external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X300
- ✓ 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 SID40X300 FAQ
Yes, the AirTAC SID40X300 is discontinued. The direct replacement is the SAID40X300, which shares the same ISO 15552 interface, 40 mm bore, 300 mm stroke, G1/4 port, and equal both ways force. The SAI family also adds upgraded piston seals and SAIL or BSAI lock variants the SI line lacked.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The operating speed is 30-800 mm/s. The bore uses a G1/4 port, has a 16 mm rod, and features 27 mm adjustable air cushions at each end that decelerate the piston near stroke end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X300
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X300 replacement — usually within 7-8 hours.