This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X400S, 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 SID125X400S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X400S
- 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 SID125X400S
The AirTAC SID125X400S is a discontinued double-acting double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. It features a 125mm bore, M27x2 rod thread, G1/2 air port, and 40mm adjustable cushions. The direct replacement is the SAID125X400S, retaining the same mounting interface, bore, stroke, and magnet.
Because both faces use the rod-side area, force is identical in both directions. The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder drifts on air loss; cushions only decelerate, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID125X400S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X400S |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAID125X400S 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 SAID125X400S 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 SID125X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SID125X400S Is Used
Equal-Force Pressing
Drives a double-ended press where the return stroke must deliver the exact same 8028 N @0.7 MPa force as the advance stroke for consistent forming.
Symmetrical Transfer Unit
Uses the rear rod as a mechanical sync link to push and pull a transfer carriage between stations without requiring external linear guides.
Dual-Tool Shuttle
Mounts a different gripper on each end of the 125mm bore cylinder to alternate pick-and-place operations within a single 400mm stroke cycle.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X400S with the SAID125X400S
To replace the discontinued SID125X400S, swap directly to the SAID125X400S, which matches the ISO 15552 dimensions, G1/2 port, and 400mm stroke. Size both directions by the equal force: if 8028 N @0.7 MPa is insufficient, step up to the 160mm bore; if excessive, drop to the 100mm bore. Choose a double-rod cylinder when you need anti-rotation stability, equal push/pull power, or a back rod to carry a sensor cam. Reuse FA, LB, or TC mounts directly. The -S magnet enables position sensing. For the 400mm stroke, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X400S
- ✓ 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 SID125X400S FAQ
Yes, the SID125X400S is discontinued. The direct replacement is the SAID125X400S. It shares the same ISO 15552 interface, 125mm bore, 400mm stroke, G1/2 port, and equal-both-ways force, but adds an upgraded two Y-shaped one-way piston seal.
Force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. Operating pressure is 0.15-1.0 MPa. Speed is 30-500 mm/s. The G1/2 port and 40mm adjustable cushions control end-of-stroke deceleration.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X400S replacement — usually within 7-8 hours.