This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X900S, 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 SID125X900S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X900S
- 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 SID125X900S
The AirTAC SID125X900S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. This discontinued model features a 125mm bore, 900mm stroke, G1/2 air port, M27x2 rod thread, and a 40mm adjustable cushion at each end. The direct replacement is the SAID125X900S, sharing the same interface, force, and mounting.
Because both faces use the rod-side area, force is equal both ways, preventing the larger single-rod push mismatch. The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches.
Airtac SID Series Double-Rod Cylinder SID125X900S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X900S |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAID125X900S 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 SAID125X900S 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 SID125X900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SID125X900S Is Used
Equal-Force Transfer Unit
Drives a conveyor pusher bar where the return stroke must match the forward stroke's 8028 N @0.7 MPa force, ensuring consistent bidirectional positioning without momentum shifts.
Dual-Tool Machining Slide
Uses both protruding rods to drive two separate machining heads simultaneously, maintaining perfect synchronization and equal force on both ends of the tooling carriage.
Cam-Driven Sensing Station
The rear rod carries a sensor cam for legacy CS1-B/DS1-B switches, providing precise end-of-stroke position feedback while the front rod actuates the primary workpiece.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X900S with the SAID125X900S
To replace the discontinued SID125X900S, use the direct replacement SAID125X900S, which matches the ISO 15552 mounting interface, 125mm bore, 900mm stroke, G1/2 port, and equal both-ways force. When sizing both ways, verify the 5734 N @0.5 MPa output fits your load, or step to neighbouring bores like 100mm or 160mm to adjust force. A double rod is right when you need equal push/pull force, anti-rotation stability, or a back rod to carry a sensor cam. Mounting options include Basic, FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B switches. For the 900mm long stroke, add external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X900S
- ✓ 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 SID125X900S FAQ
Yes, the SID125X900S is discontinued. The direct replacement is the SAID125X900S. It shares the same ISO 15552 interface, 125mm bore, 900mm stroke, G1/2 port, and equal both-ways force. The SAI family also adds an upgraded piston seal and SAIL/BSAI lock variants the SI line lacked.
Force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. Speed is 30-500 mm/s. A plain cylinder does not hold loads on air loss; the 40mm air cushion only decelerates near stroke end. For held loads, use an external rod lock or the SAIL/BSAI variant.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X900S replacement — usually within 7-8 hours.