This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X400, 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 SID50X400
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X400
- 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 SID50X400
The AirTAC SID50X400 is a double-acting, double-rod ISO 15552 cylinder featuring a 50mm 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 (825N at 0.5MPa). This SKU has no -S magnet and cannot take a magnetic switch. The discontinued SID50X400 is replaced by the direct replacement SAID50X400, which uses an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The SAID50X400 shares the exact G1/4 port, M16x1.5 rod thread, 30mm cushions, and ISO 15552 mounting interface. With a 400mm stroke, external guides are recommended to prevent rod bending under side loads. Note that air cushions only decelerate; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variant.
Airtac SID Series Double-Rod Cylinder SID50X400 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X400 |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID50X400 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAID50X400 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 SID50X400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SID50X400 Is Used
Synchronized Transfer
Drives two linked conveyor pick-off arms simultaneously from one piston, keeping motion perfectly synchronized without external linkages.
Anti-Rotation Tooling
Powers a machining fixture requiring high torsional resistance, using the dual-rod geometry to prevent unwanted rotation during cutting.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X400 with the SAID50X400
To replace the discontinued SID50X400, use the direct replacement SAID50X400, reusing your existing FA, LB, or TC ISO 15552 mounts. Because force is equal both ways, size both directions by checking neighbouring bores: a 40mm bore yields 528N, while a 63mm bore yields 1402N at 0.5MPa. Choose a double-rod cylinder when you need anti-rotation stability or need to drive two tools simultaneously. Since this SKU lacks an -S magnet, it cannot support sensors. For the 400mm stroke, ensure external guides are used to manage side-load and prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X400
- ✓ 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 SID50X400 FAQ
Yes, the SID50X400 is discontinued. The direct replacement is the SAID50X400, which shares the same ISO 15552 interface, 50mm bore, 400mm stroke, G1/4 port, and mounting hardware. The SAI family also adds upgraded piston seals and new SAIL and BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 825N at 0.5MPa, 1154N at 0.7MPa, and 1484N at 0.9MPa. The bore dictates a fixed G1/4 air port. Note that air cushions only decelerate near stroke end; they do not hold loads on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X400
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X400 replacement — usually within 7-8 hours.