This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X350S, 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 SID125X350S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X350S 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 SAID125X350S, 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 → SAID125X350S
- 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 SID125X350S
The AirTAC SID125X350S 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, 350mm stroke, G1/2 air port, M27x2 rod thread, and 40mm adjustable cushions. The direct replacement is the SAID125X350S, retaining the same interface, force, and mounting.
Because both faces use the rod-side area, the back rod can carry a sensor cam or drive two tools simultaneously while preventing rotation. The SAI successor upgrades to a two Y-shaped one-way piston seal for lower start-up pressure. Note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for load holding.
Airtac SID Series Double-Rod Cylinder SID125X350S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X350S |
| 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 SAID125X350S 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 SAID125X350S 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 SID125X350S
| 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 SID125X350S Is Used
Dual-Station Machining
Drives two opposing machining heads from one piston, utilizing the equal both-ways force to ensure consistent clamping pressure on both ends.
Anti-Rotation Transfer
Transfers parts across a conveyor using the double-rod structure to prevent mechanical twist and maintain precise alignment without external guides.
Symmetric Push-Pull Diverters
Powers a central sorting gate where the rod extends through both ends to shift packages left or right with identical 5734 N force at 0.5 MPa.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X350S with the SAID125X350S
Replace the discontinued SID125X350S directly with the SAID125X350S, matching the 125mm bore, 350mm stroke, and G1/2 port. Size both ways by checking neighboring bores, but remember the double-rod design provides equal force in both directions. Choose a double-rod cylinder when anti-rotation is needed or when driving two tools from one piston. Reuse existing FA, LB, or TC ISO 15552 mounts. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAI replacement uses current switches). For this 350mm stroke, add external guides to prevent rod bending under side loads. The cylinder will not hold a load without live air.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X350S
- ✓ 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 SID125X350S FAQ
Yes, the SID125X350S is discontinued. The direct replacement is the SAID125X350S, which shares the same ISO 15552 interface, 125mm bore, 350mm stroke, G1/2 port, and mounting hardware.
Force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. Operating speed is 30-500 mm/s. The G1/2 port and 40mm adjustable cushions manage deceleration at stroke ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X350S replacement — usually within 7-8 hours.