This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X185S, 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 SID125X185S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X185S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 185mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X185S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X185S
- 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 SID125X185S
The AirTAC SID125X185S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. It features a 125 mm bore, a G1/2 air port, an M27x2 rod thread, and 40 mm adjustable air cushions. This SID model is discontinued; the direct replacement is the SAID125X185S, sharing the same ISO 15552 interface, bore, stroke, and mounting.
The SAID upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, plus SAIL and BSAI lock variants absent from the SI line. The double-rod design prevents rotation and lets the rear rod carry a sensor cam. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; an external rod lock is required to hold loads on air loss.
Airtac SID Series Double-Rod Cylinder SID125X185S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X185S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X185S |
| Bore size | Ø125 mm |
| Stroke | 185 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID125X185S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAID125X185S 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 SID125X185S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | 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 SID125X185S Is Used
Twin-Tool Machining Station
Drives two opposing machining heads simultaneously with equal force both ways, maintaining precise alignment via the rigid double-rod architecture.
Anti-Rotation Transfer Gate
Actuates a heavy transfer gate on a packaging line where the second rod prevents rotation and ensures smooth linear motion without torsional deflection.
Symmetric Lift Platform
Lifts work carriers vertically using both rod ends, leveraging the 292 kg vertical lift capacity to balance loads evenly across the stroke.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X185S with the SAID125X185S
To replace the discontinued SID125X185S, install the direct replacement SAID125X185S, which matches the ISO 15552 mounting interface, G1/2 port, and 185 mm stroke exactly. Size both ways by confirming the equal push/pull force of 5734 N @0.5 MPa; if less force is acceptable, step down to the 100 mm bore (3681 N), or step up to 160 mm (9425 N) for higher demands. A double-rod cylinder is the right choice when you need anti-rotation stability or must drive two tools simultaneously. Reuse FA, LB, or TC mounts, and specify the -S magnet if sensors are needed. For strokes of 300 mm or longer, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X185S
- ✓ 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 SID125X185S FAQ
Yes, the SID125X185S is discontinued. The direct replacement is the SAID125X185S, which shares the same ISO 15552 interface, 125 mm bore, 185 mm stroke, G1/2 port, and mounting hardware.
Because it is a double-rod cylinder, force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. Operating speed is 30-500 mm/s. It uses a G1/2 port and 40 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X185S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X185S replacement — usually within 7-8 hours.