This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X50, 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 SID125X50
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X50
- 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 SID125X50
The AirTAC SID125X50 is a 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, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa. It features a 125 mm bore, a 50 mm stroke, a 32 mm piston rod, M27x2 rod threads, and a G1/2 air port. This legacy model is discontinued, with the direct replacement being the SAID125X50, which shares the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnetic SKU cannot accept a sensor. A plain cylinder does not hold loads on air loss; the 40 mm cushions only decelerate near stroke end, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID125X50 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X50 |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAID125X50 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 SAID125X50 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 SID125X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SID125X50 Is Used
Twin-Tool Machining Station
Drives two opposing machining heads simultaneously from one central 125 mm bore piston, utilizing the equal both ways force to maintain perfectly synchronized cutting pressure.
Anti-Rotation Transfer Gate
Employs the dual exiting rods to mechanically prevent rotation during heavy product diversion on a conveyor line, ensuring stable lateral transfers without external guides.
Balanced Pallet Stopper
Acts as a high-force pallet stop where the 5734 N equal force at 0.5 MPa safely halts incoming loads, while the back rod simultaneously triggers a mechanical cam.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X50 with the SAID125X50
To replace the discontinued SID125X50, install the direct replacement SAID125X50, which reuses the exact ISO 15552 mounting interface and G1/2 port without bracket changes. Size both ways by verifying the equal force of 5734 N at 0.5 MPa fits your load, or step to neighbour bores (100 mm or 160 mm) if margins differ. A double rod is right when you need anti-rotation stability or must drive two tools simultaneously. Use FA, LB, or TC mounts, and since this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For this 50 mm stroke, side-load is minimal, but for any stroke >=300 mm, ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X50
- ✓ 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 SID125X50 FAQ
Yes, the SID125X50 is discontinued. The direct replacement is the SAID125X50, sharing the same ISO 15552 interface, 125 mm bore, 50 mm stroke, G1/2 port, and mounting brackets.
The double-rod design provides equal force both ways: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa. The fixed air port is G1/2, operating at 30-500 mm/s with 40 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X50
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X50 replacement — usually within 7-8 hours.