This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X160LB, 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 SI125 Standard Cylinder SI125X160LB
The AirTAC SI125 Standard Cylinder SI125X160LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 160mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X160LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke160 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X160LB
- 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 SI125 Standard Cylinder SI125X160LB
The AirTAC SI125X160LB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 160 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a 32 mm rod, M27x2 thread, G1/2 port, and 40 mm adjustable cushions. Because this SKU lacks a magnet, it cannot accept a position switch. The direct replacement is the SAI125X160LB, which matches the original LB foot mount, output, and ISO 15552 interface dimensions exactly.
Upgrading to the SAI125X160LB retains the exact bore, stroke, and port but introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI line lacked.
Airtac SI125 Standard Cylinder SI125X160LB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X160LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X160LB |
| Bore size | Ø125 mm |
| Stroke | 160 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 SAI125X160LB 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 SAI125X160LB produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X160LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×160 | 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 SI125 Standard Cylinder SI125X160LB Is Used
Heavy Press Clamping
Ideal for securing large steel plates in a press fixture, utilizing the 6136 N push force at 0.5 MPa to hold components firmly during machining operations.
Bulk Material Diversion
Mounts via the LB foot bracket to power heavy-duty diverter gates on high-capacity conveyor lines, handling the 160 mm stroke to redirect large product flows.
Replacing the Airtac SI125 Standard Cylinder SI125X160LB with the SAI125X160LB
To replace the SI125X160LB, order the SAI125X160LB. Verify the ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, G1/2 port, and LB foot accessory. This non-magnetic SKU cannot take a sensor; if position feedback is needed, select an SAI model with the S magnet option and current AirTAC switches. Operating speed is 30-500 mm/s. If sizing up or down, note the 100 mm bore offers 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Because this is a plain double-acting cylinder, it will not hold a load on air loss—the cushion only decelerates near stroke end. For secure holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. At 160 mm stroke, side-load is minimal, but always ensure proper guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X160LB
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X160LB FAQ
Yes, the AirTAC SI125X160LB is discontinued. The direct replacement is the SAI125X160LB. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 160 mm stroke, G1/2 port, LB mount, and output force exactly, so it drops right into existing fixtures.
The bore is 125 mm with a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X160LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X160LB replacement — usually within 7-8 hours.