This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X340, 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 SID40X340
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X340 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 340mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X340, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke340 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X340
- 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 SID40X340
The AirTAC SID40X340 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring force is equal both ways (528 N @0.5 MPa). This SKU lacks a magnet (-S), so it cannot accept reed or solid-state switches. The G1/4 port and M12x1.25 rod thread are fixed by the 40 mm bore. This SID model is discontinued; the direct replacement is the SAID40X340, reusing the exact ISO 15552 mounting interface and adjustable 27 mm cushions.
The SAI upgrade features a two-piece Y-shaped piston seal for lower start-up pressure and longer life. A double rod resists rotation and can drive two tools simultaneously. Air cushions only decelerate near stroke end; use an external rod lock or SAIL/BSAI variant for load holding, especially at the 340 mm stroke where external guides prevent rod bending.
Airtac SID Series Double-Rod Cylinder SID40X340 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X340 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X340 |
| Bore size | Ø40 mm |
| Stroke | 340 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 SAID40X340 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 SAID40X340 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 SID40X340
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×340 | 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 SID40X340 Is Used
Dual-Tool Drive Station
Uses the extending front rod to push a part while the rear rod simultaneously retracts a tool, keeping cycle time low with equal 739 N force @0.7 MPa.
Anti-Rotation Transfer
Transfers workpieces across a belt using the double-rod structure to resist mechanical twist without needing external linear bearings.
Balanced Lowering Lift
Lowers a 27 kg payload smoothly using the equal both-ways force, relying on adjustable 27 mm cushions to decelerate before the end of the 340 mm stroke.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X340 with the SAID40X340
Replace the discontinued SID40X340 directly with the SAID40X340, matching the 40 mm bore, 340 mm stroke, G1/4 port, and ISO 15552 mounting (Basic, FA, LB, TC). Because force is equal both ways, size both push and pull by the same values: 528 N @0.5, 739 N @0.7, and 950 N @0.9 MPa. If more force is needed, step up to the 50 mm bore; if less, drop to 32 mm. Choose a double-rod cylinder when anti-rotation is required or a back rod carries a sensor cam. This non-magnetic SKU cannot take switches; add the -S suffix on the SAID if sensing is needed. For the 340 mm stroke, use external guides to manage side loads and prevent rod bending. Speed ranges 30-800 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X340
- ✓ 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 SID40X340 FAQ
Yes, the SID40X340 is discontinued. The direct replacement is the SAID40X340. It shares the same ISO 15552 interface, 40 mm bore, 340 mm stroke, G1/4 port, and equal-both-ways force, but adds an upgraded two-piece Y-shaped piston seal.
The G1/4 port is fixed by the 40 mm bore. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X340
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X340 replacement — usually within 7-8 hours.