This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X40, 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 SID50X40
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X40
- 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 SID50X40
The AirTAC SID50X40 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This model is discontinued and the direct replacement is the SAID50X40, matching the 50mm bore, 40mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Because the second rod acts as an anti-rotation guide and can drive a second tool simultaneously, this design is highly stable. Note this non-magnetic SKU cannot take a sensor switch. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL/BSAI variant for held loads, as the 30mm adjustable cushion only decelerates.
Airtac SID Series Double-Rod Cylinder SID50X40 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X40 |
| Bore size | Ø50 mm |
| Stroke | 40 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 SAID50X40 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 SAID50X40 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 SID50X40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SID50X40 Is Used
Dual-Tool Synchronized Machining
Drives two opposing machining heads simultaneously with equal 1154 N @0.7 MPa force on both faces, ensuring perfectly balanced material removal without rotational drift.
Anti-Rotation Transfer Pusher
Transfers workpieces along a conveyor using the twin-rod architecture to resist side loads and prevent jaw twisting during rapid 30-800 mm/s actuation.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X40 with the SAID50X40
To replace the discontinued SID50X40, install the direct replacement SAID50X40, which retains the exact ISO 15552 mounting interface and G1/4 port. Size both ways by checking neighbour bores: the 40mm bore yields 528/739/950 N, while the 63mm bore yields 1402/1962/2523 N, ensuring you match the required equal-both-ways force. A double rod is right when you need anti-rotation stability or must drive two tools from one piston. Mounting options include Basic, FA, LB, and TC. This SKU lacks the -S magnet and cannot support sensing. For stroke lengths >=300, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X40
- ✓ 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 SID50X40 FAQ
Yes, the SID50X40 is discontinued. The direct replacement is the SAID50X40. It shares the same ISO 15552 interface, 50mm bore, 40mm stroke, G1/4 port, and equal both-ways force, while adding an upgraded piston seal.
The bore is 50mm with a G1/4 air port and M16x1.5 rod thread. Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The adjustable cushion is 30mm, and speed is 30-800 mm/s.
Request a Quote for the SAID50X40
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X40 replacement — usually within 7-8 hours.