This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X350S, 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 SID40X350S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X350S
- 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 SID40X350S
The AirTAC SID40X350S is a discontinued 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. It features a 40 mm bore, G1/4 air port, M12x1.25 rod thread, 27 mm adjustable cushions, and a built-in -S piston magnet for CS1-B/DS1-B switches. The direct replacement is the SAID40X350S, which reuses the same ISO 15552 mounting interface, bore, stroke, and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life, alongside SAIL and BSAI lock variants absent in the SI line. A plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID40X350S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X350S |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAID40X350S 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 SAID40X350S 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 SID40X350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SID40X350S Is Used
Dual-Tool Drive Station
Uses both extending rods to push and pull separate tooling simultaneously, ensuring equal 528 N force in both directions for balanced machining operations.
Anti-Rotation Transfer Arm
The twin-rod geometry prevents mechanical twist during horizontal transfer, maintaining strict alignment without needing external linear bearings.
Cam-Driven Sensing End
Mounts a sensor cam on the rear rod while the front rod performs work, allowing position confirmation via the -S magnet without cluttering the primary motion axis.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X350S with the SAID40X350S
To replace the discontinued SID40X350S, drop in the SAID40X350S directly—it matches the 40 mm bore, 350 mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC) without bracket changes. Because force is equal both ways (528 N @0.5 MPa), size both directions identically; if you need less force, step down to the 32 mm bore (345 N), or step up to the 50 mm bore (825 N) for more power. Choose a double-rod cylinder when you need anti-rotation stability, a back rod to carry a sensor cam, or to drive two tools simultaneously. The -S suffix confirms the piston magnet is present for legacy CS1-B/DS1-B switches. For this 350 mm stroke, factor in side-load and rod-bending risks by using external guides to support the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X350S
- ✓ 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 SID40X350S FAQ
Yes, the SID40X350S is discontinued. The direct replacement is the SAID40X350S, which shares the identical ISO 15552 mounting interface, 40 mm bore, 350 mm stroke, G1/4 port, and equal-both-ways force. The SAI upgrade adds a two Y-shaped one-way piston seal for longer life.
The double-rod design makes push and pull force equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm, the air port is G1/4, the rod thread is M12x1.25, and it has 27 mm adjustable cushions at each end. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X350S
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