This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X250, 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 SID125X250
The AirTAC SID Series Double-Rod Cylinder SID125X250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X250
- 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 SID125X250
The AirTAC SID125X250 is a discontinued ISO 15552 double-acting double-rod cylinder. A rod exits both ends on one piston, so both faces use the rod-side area, making push and pull force equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The direct replacement is the SAID125X250, matching the 125mm bore, 250mm stroke, G1/2 port, and mounting interface. The SAI family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because the second rod prevents piston rotation, it suits guided mechanisms and can drive two tools from one actuator. With no -S suffix, this SKU cannot take a magnetic switch. A plain cylinder does not hold loads on air loss; the air cushion only decelerates near stroke end. For held loads, use an external rod lock or pilot-operated check valve.
Airtac SID Series Double-Rod Cylinder SID125X250 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X250 |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAID125X250 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 SAID125X250 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 SID125X250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SID125X250 Is Used
Twin-Tool Machining Station
Drives two opposing machining heads simultaneously with equal 5734 N force at 0.5 MPa, ensuring balanced material removal on both faces.
Anti-Rotation Transfer Gate
Uses the dual-rod architecture to prevent mechanical twist during heavy workpiece diversion, eliminating the need for external linear guides.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X250 with the SAID125X250
Replace the discontinued SID125X250 directly with the SAID125X250, reusing your existing ISO 15552 FA, LB, or TC mounts. Size both directions by equal force: if 5734 N @0.5 MPa is insufficient, step up to the 160mm bore, or drop to the 100mm bore if overspecified. Choose a double-rod cylinder when you need anti-rotation resistance or must drive two tools simultaneously. This SKU lacks the -S magnet and cannot accept sensors. For this 250mm stroke, side-load is minimal, but for any stroke >=300mm, ensure external guide rails to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X250
- ✓ 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 SID125X250 FAQ
Yes, the SID125X250 is discontinued. The direct replacement is the SAID125X250. It matches the ISO 15552 mounting interface, 125mm bore, 250mm stroke, G1/2 port, and equal both-ways force, while adding an upgraded piston seal.
Force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The air port is G1/2, the rod thread is M27x2, and adjustable air cushions are 40mm at each end. Speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X250
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X250 replacement — usually within 7-8 hours.