This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X250S, 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 SID125X250S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X250S 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 SAID125X250S, 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 → SAID125X250S
- 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 SID125X250S
The AirTAC SID125X250S is a discontinued double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal push and pull force of 5734 N at 0.5 MPa. It features a 125mm bore, a 32mm piston rod, M27x2 rod threads, and a G1/2 air port. The direct replacement is the SAID125X250S, sharing the same mounting interface, stroke, and cushioning.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note that air cushions only decelerate near stroke end; use an external rod lock or SAIL/BSAI variant for load holding on air loss.
Airtac SID Series Double-Rod Cylinder SID125X250S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X250S |
| 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 SAID125X250S 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 SAID125X250S 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 SID125X250S
| 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 SID125X250S Is Used
Synchronized Dual-Tool Drive
Drives two independent operations from one stroke using both rod ends, ensuring perfectly synchronized timing without adding a second cylinder.
Anti-Rotation Guiding
The dual-rod architecture naturally resists torsional deflection, maintaining strict parallelism for precision pressing and gauging tasks.
Symmetrical Transfer Arm
Uses the rear rod extension to mount a sensor cam, tracking position while the front rod shifts heavy workpieces between conveyor stations.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X250S with the SAID125X250S
To replace the discontinued SID125X250S, install the SAID125X250S directly—its ISO 15552 dimensions, G1/2 port, and 250mm stroke match exactly. When sizing both ways, verify the equal 5734 N force at 0.5 MPa meets your needs, or step to neighbouring bores (100mm or 160mm) for different thrust. Choose a double-rod setup when you need anti-rotation stability or want to drive two tools from one piston. Reuse FA, LB, or TC mounts. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. For strokes of 300mm or longer, carefully manage side-load alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X250S
- ✓ 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 SID125X250S FAQ
Yes, the SID125X250S is discontinued. The direct replacement is the SAID125X250S, which shares the same ISO 15552 interface, 125mm bore, 250mm stroke, G1/2 port, and mounting options.
Force is equal both ways: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa. Speed is 30-500 mm/s. The G1/2 port and 40mm adjustable cushions at each end manage deceleration.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X250S replacement — usually within 7-8 hours.