This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X50, 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 SID40X50
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X50
- 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 SID40X50
The AirTAC SID40X50 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding identical push and pull forces (528 N at 0.5 MPa). Because both faces use the rod-side annular area, you get equal both-ways thrust without the larger single-rod push value. This 40 mm bore unit has a 16 mm rod, M12x1.25 thread, G1/4 port, and 27 mm cushions. The SID line is discontinued; the direct is the SAID40X50, reusing the exact ISO 15552 mounting interface, bore, stroke, and porting.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. Without a -S suffix this SKU lacks a magnet, so it cannot carry a sensor. A plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID40X50 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X50 |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAID40X50 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 SAID40X50 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 SID40X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SID40X50 Is Used
Dual-Tool Transfer
Simultaneously pushes and pulls two separate workpieces from a single center mount using equal both-ways thrust.
Anti-Rotation Gauge
The twin 16 mm rods prevent piston twist during precision positioning, maintaining strict linear alignment without external guides.
Symmetric Clamping
Applies identical 528 N clamping force in both directions to center and hold a workpiece profile during machining.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X50 with the SAID40X50
Replace the discontinued SID40X50 directly with the SAID40X50; it preserves the G1/4 port, 50 mm stroke, and ISO 15552 mounting footprint (Basic, FA, LB, TC). Size both ways by checking neighbour bores (32 mm or 50 mm) against your equal both-ways force requirement. A double rod is right when you need anti-rotation stability or must drive two tools from one piston. Because this SKU has no -S magnet, you cannot mount legacy CS1-B/DS1-B sensors. For this 50 mm stroke side-load is minimal, but for any stroke >=300 mm verify your guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X50
- ✓ 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 SID40X50 FAQ
Yes, the SID40X50 is discontinued. The direct replacement is the SAID40X50. It shares the same ISO 15552 interface, 40 mm bore, 50 mm stroke, G1/4 port, and mounting options, while adding an upgraded piston seal.
Force is equal both ways: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa. The air port is G1/4, the rod is 16 mm with an M12x1.25 thread, cushion is 27 mm, and speed is 30-800 mm/s. It never quotes a larger single-rod push value.
Request a Quote for the SAID40X50
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X50 replacement — usually within 7-8 hours.