This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X185S, 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 SID40X185S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X185S 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 SAID40X185S, 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 → SAID40X185S
- 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 SID40X185S
The AirTAC SID40X185S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Because both faces use the rod-side area, push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm, the piston rod is Ø16 mm, and the air port is G1/4. This SID model is discontinued; the direct replacement is the SAID40X185S, sharing the same interface, stroke, and mounting.
The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. A double-rod design prevents rotation and lets the back rod carry a sensor cam. The -S suffix means a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder drifts on air loss; the cushion only decelerates, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID40X185S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X185S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X185S |
| 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 SAID40X185S 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 SAID40X185S 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 SID40X185S
| 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 SID40X185S Is Used
Transfer Pusher
Equal both-ways force pushes and retracts parts on a conveyor without force imbalance.
Dual-Tool Drive
The rear rod drives a secondary mechanism or sensor cam while the front rod performs work.
Lift and Lower
Symmetrical push and pull force provides stable vertical lifting without rod-side force drop.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X185S with the SAID40X185S
To replace the discontinued SID40X185S, specify the SAID40X185S, which is a direct match for the ISO 15552 mounting interface, 185 mm stroke, G1/4 port, and M12x1.25 rod thread. Size both ways by confirming the 528 N @0.5 MPa equal force is sufficient; if more force is needed, step up to the 50 mm bore. A double rod is right when you need anti-rotation, equal force both ways, or a back rod to drive a second tool. Reuse FA, LB, or TC mounts. The -S magnet enables sensors. For this 185 mm stroke, side-load is minimal, but for strokes >=300 mm ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X185S
- ✓ 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 SID40X185S FAQ
Yes, the SID40X185S is discontinued. The direct replacement is the SAID40X185S, which matches the ISO 15552 mounting, 40 mm bore, 185 mm stroke, and G1/4 port.
Force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. Speed is 30-800 mm/s. The cushion only decelerates; it does not hold loads on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X185S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X185S replacement — usually within 7-8 hours.