This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X350, 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 SID125X350
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X350 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X350, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X350
- 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 SID125X350
The AirTAC SID125X350 is a double-acting, double-rod ISO 15552 cylinder featuring a 125mm bore and 350mm stroke. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal at 5734N @0.5MPa, 8028N @0.7MPa, and 10321N @0.9MPa. This SID model is discontinued; the direct replacement is the SAID125X350, which reuses the same G1/2 port, M27x2 rod thread, and 40mm adjustable cushions. The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life.
This non-magnetic SKU (no -S suffix) cannot take a sensor switch. A plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID125X350 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X350 |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAID125X350 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 SAID125X350 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 SID125X350
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SID125X350 Is Used
Equal-Force Forming Press
Drives a stamping die where the return stroke must exert the same 8028N @0.7MPa force as the advance, ensuring consistent ejection of heavy workpieces.
Dual-End Transfer Unit
Uses the protruding back rod to push a secondary transfer carriage on the opposite side of the machine, synchronizing two conveyor lanes without extra valves.
Anti-Rotation Lift Gate
Lifts a 292kg vertical load using both rods to resist torsional twist and prevent binding, maintaining smooth guidance without external linear bearings.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X350 with the SAID125X350
To replace the discontinued SID125X350, install the direct replacement SAID125X350, which matches the ISO 15552 mounting interface, 350mm stroke, G1/2 port, and equal-both-ways force. When sizing both ways, verify your load against the 5734N @0.5MPa rating, or step to neighboring bores if higher force is needed. 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. For the 350mm stroke, add external guides to prevent rod bending under side loads. This SKU lacks the -S magnet, so it cannot use legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X350
- ✓ 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 SID125X350 FAQ
Yes, the SID125X350 is discontinued. The direct replacement is the SAID125X350. It shares the same ISO 15552 interface, 125mm bore, 350mm stroke, G1/2 port, and equal-both-ways force, but adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Because it is a double-rod cylinder, force is equal both ways: 5734N @0.5MPa, 8028N @0.7MPa, and 10321N @0.9MPa. The air port is G1/2, the rod thread is M27x2, and it has 40mm adjustable cushions at each end. Operating speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X350
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X350 replacement — usually within 7-8 hours.