This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X350, 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 SID40X350
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X350 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 SAID40X350, 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 → SAID40X350
- 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 SID40X350
The AirTAC SID40X350 is a double-acting, double-rod ISO 15552 cylinder featuring a 40mm bore and 350mm stroke. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal at 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. This model is discontinued and end-of-life; the direct replacement is the SAID40X350, matching the G1/4 port, M12x1.25 thread, 27mm cushion, 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.
This SKU lacks a -S magnet and cannot take a magnetic switch. The double-rod design prevents rotation and lets the back rod carry a sensor cam or drive two tools. A plain cylinder does not hold loads on air loss; the cushion only decelerates. For held loads, use an external rod lock, pilot-operated check valve, or SAIL/BSAI lock variant.
Airtac SID Series Double-Rod Cylinder SID40X350 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X350 |
| 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 SAID40X350 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 SAID40X350 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 SID40X350
| 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 SID40X350 Is Used
Synchronized Transfer Pusher
Drives opposing conveyor lanes simultaneously from a central point using both rods, ensuring perfectly synchronized part transfers without torsional twist.
Anti-Rotation Gripper Slide
Powers a precision pick-and-place gripper where the second rod prevents rotational drift during vertical descent, maintaining jaw alignment under offset loads.
Dual-Station Forming Press
Actuates two separate forming tools from one piston assembly, utilizing the equal both-ways force to deliver consistent 528N @0.5MPa clamping at both workstations.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X350 with the SAID40X350
To replace the discontinued SID40X350, specify the SAID40X350 direct, keeping the 40mm bore, 350mm stroke, and G1/4 port. Size both ways by checking the equal 528N @0.5MPa force against your load, or step to neighbouring bores (32mm or 50mm) if margins require. Choose a double-rod cylinder when you need anti-rotation, a back rod for a sensor cam, or to drive two tools. Mounting uses FA, LB, or TC brackets via the ISO 15552 interface. As this 350mm stroke exceeds 300mm, add external guides to prevent rod bending and side-load wear. Select the -S magnet option if you need sensing, as this no-S SKU cannot take switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X350
- ✓ 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 SID40X350 FAQ
Yes, the AirTAC SID40X350 is discontinued and end-of-life. The direct replacement is the SAID40X350, which matches the 40mm bore, 350mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family also adds an upgraded piston seal and SAIL/BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. The air port is G1/4, the rod thread is M12x1.25, and it has 27mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X350
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X350 replacement — usually within 7-8 hours.