This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X185, 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 SID40X185
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X185 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 185mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X185, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X185
- 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 SID40X185
The AirTAC SID40X185 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This 40 mm bore model features a 16 mm rod, M12x1.25 rod-end thread, G1/4 air port, and 27 mm adjustable air cushions at each end. The SID40X185 is discontinued and the direct replacement is the SAID40X185, sharing the same ISO 15552 mounting interface, bore, stroke, and port.
The SAID40X185 upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life, while the SAI family adds SAIL and BSAI lock variants the SI line lacked. Because the second rod can drive two tools or carry a sensor cam, it provides anti-rotation stability. This SKU has no -S magnet and cannot take a magnetic switch.
Airtac SID Series Double-Rod Cylinder SID40X185 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X185 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X185 |
| Bore size | Ø40 mm |
| Stroke | 185 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 SAID40X185 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 SAID40X185 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 SID40X185
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SID40X185 Is Used
Dual-Tool Machining Station
Drives two opposing machining heads simultaneously from one piston, utilising the equal both ways force to ensure perfectly balanced cutting cycles.
Anti-Rotation Transfer Gate
Uses the twin-rod architecture to prevent mechanical twist during rapid package diverting on a high-speed packaging line.
Symmetric Clamping Fixture
Applies equal clamping pressure from both ends of a workpiece, relying on the 528 N @0.5 MPa force to secure components without shifting.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X185 with the SAID40X185
To replace the discontinued SID40X185, use the SAID40X185 direct directly; the ISO 15552 interface, G1/4 port, and 185 mm stroke match exactly. Size both ways by checking neighbouring bores (32 mm or 50 mm) to ensure the equal both ways force (528 N @0.5 MPa here) meets your needs. 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. For stroke lengths >=300 mm, verify your side-load limits. This non-magnetic SKU cannot support sensors. A plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X185
- ✓ 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 SID40X185 FAQ
Yes, the SID40X185 is discontinued. The direct replacement is the SAID40X185, which shares the same ISO 15552 mounting interface, 40 mm bore, 185 mm stroke, G1/4 port, and equal both ways force.
Force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore dictates a fixed G1/4 air port. It cannot hold loads without live air, as the cushion only decelerates.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X185
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X185 replacement — usually within 7-8 hours.