This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X70S, 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 SID125X70S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X70S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 70mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X70S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X70S
- 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 SID125X70S
The AirTAC SID125X70S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. This discontinued model features a 125mm bore, 70mm stroke, G1/2 air port, M27x2 rod thread, and a 40mm adjustable cushion at each end. The direct replacement is the SAID125X70S, which reuses the exact ISO 15552 mounting interface and adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
The dual-rod design prevents piston rotation and allows the back rod to carry a sensor cam or drive a second tool simultaneously. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate the piston near stroke end; they do not hold loads on air loss, so an external rod lock or SAIL/BSAI variant is required for held loads.
Airtac SID Series Double-Rod Cylinder SID125X70S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X70S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X70S |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAID125X70S 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 SAID125X70S 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 SID125X70S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SID125X70S Is Used
Twin-Tool Machining Station
Drives two opposing machining heads simultaneously from a single 125mm bore piston, utilizing the equal both ways force to ensure balanced material removal without rotation.
Anti-Rotation Transfer Gate
Shifts a heavy routing diverter on a packaging line, relying on the dual-rod geometry to prevent mechanical twisting and maintain precise tracking over millions of cycles.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X70S with the SAID125X70S
To replace the discontinued SID125X70S, install the direct replacement SAID125X70S, which matches the 125mm bore, 70mm stroke, G1/2 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC, FTC, TCM1, TCM2). When sizing both ways, verify the equal push/pull force of 8028 N @0.7 MPa meets your requirement, or step to neighbouring bores if more force is needed. A double-rod cylinder is the right choice when you need anti-rotation stability or must drive two tools from one piston. The -S magnet supports legacy CS1-B/DS1-B sensors. For this 70mm stroke, side-load is minimal, but for any stroke >=300mm, ensure guide alignment to prevent rod binding. Operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X70S
- ✓ 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 SID125X70S FAQ
Yes, the SID125X70S is discontinued. The direct replacement is the SAID125X70S. It shares the identical ISO 15552 mounting interface, 125mm bore, 70mm stroke, G1/2 port, and equal both ways force, but upgrades to a two Y-shaped one-way piston seal for longer life.
Because it is a double-rod cylinder, the push and pull force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The operating speed is 30-500 mm/s, operating pressure is 0.15-1.0 MPa, and it features a 40mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X70S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X70S replacement — usually within 7-8 hours.