This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X400, 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 SID40X400
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X400
- 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 SID40X400
The AirTAC SID40X400 is a double-acting, double-rod ISO 15552 cylinder featuring a 40mm bore and 400mm stroke. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal both ways (528N @0.5MPa). This discontinued model is directly replaced by the SAID40X400, which shares the exact G1/4 port, M12x1.25 rod thread, and ISO mounting interface. The SAI upgrade uses an advanced two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Because the second rod drives a sensor cam or two tools while resisting rotation, this configuration is ideal for precise handling. Without a -S suffix, this SKU cannot take a magnetic switch. Note that air cushions only decelerate near stroke end; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID40X400 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X400 |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAID40X400 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 SAID40X400 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 SID40X400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SID40X400 Is Used
Twin-Tool Machining Station
Uses the dual extending rods to drive two opposing tools simultaneously, ensuring perfectly balanced cutting pressure with equal 528N force both ways at 0.5MPa.
Anti-Rotation Transfer Gate
The double-rod architecture prevents mechanical twist during rapid 400mm sorting strokes on packaging lines, maintaining precise alignment without external guides.
Symmetric Pallet Stopper
Employs the back rod as a mechanical cam to trigger external proximity sensors, while the front rod blocks pallets with equal push and pull resistance.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X400 with the SAID40X400
To replace the discontinued SID40X400, specify the direct replacement SAID40X400 to reuse existing FA, LB, or TC ISO 15552 mounts without machining. Size both ways by checking neighbour bores: the 32mm bore yields 345N @0.5MPa, while the 50mm yields 825N @0.5MPa, ensuring your equal-both-ways force matches the 528N requirement. A double rod is right when you need anti-rotation stability or a back rod to carry a cam. As this is a non-magnetised SKU, position sensing is impossible. For this 400mm stroke, external guides are recommended to prevent rod bending under side loads. A plain cylinder drifts on air loss; use a pilot-operated check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X400
- ✓ 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 SID40X400 FAQ
Yes, the SID40X400 is discontinued. The direct replacement is the SAID40X400, which matches the 40mm bore, 400mm stroke, G1/4 port, and ISO 15552 mounting interface, while adding an upgraded piston seal.
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 adjustable air cushions are 27mm at each end. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X400
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X400 replacement — usually within 7-8 hours.