This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X80SLB, 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 SI125X80SLB
The AirTAC SI125 Standard Cylinder SI125X80SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 80mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X80SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X80SLB
- 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 SI125X80SLB
The AirTAC SI125X80SLB is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and LB foot mount. Delivering 6136 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI125X80SLB. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL and BSAI lock variants absent in the legacy line.
The original -S magnet supports CS1-B/DS1-B sensors, while the SAI takes current AirTAC switches. Rod material options include carbon steel, SUS420J2, and SUS304, with Viton H seals available for high-temperature duties.
Airtac SI125 Standard Cylinder SI125X80SLB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X80SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X80SLB |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAI125X80SLB 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 SAI125X80SLB 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 SI125X80SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SI125X80SLB Is Used
Heavy Pressing
Applies 6136 N at 0.5 MPa for seating heavy components and forming operations on automated lines.
Clamping Fixtures
Secures large workpieces during machining, relying on the 125 mm bore for rigid, high-force holding.
Replacing the Airtac SI125 Standard Cylinder SI125X80SLB with the SAI125X80SLB
To replace the SI125X80SLB, order the SAI125X80SLB. Verify the ISO 15552 LB foot mount, 80 mm stroke, G1/2 port, and the -S magnet for switch sensing. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. The 32 mm rod and M27x2 thread must align with your mechanics.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X80SLB
- ✓ 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 SI125X80SLB FAQ
Yes, the SI125X80SLB is discontinued. The direct replacement is the SAI125X80SLB. It matches the ISO 15552 mounting interface, 125 mm bore, 80 mm stroke, force, and G1/2 port, fitting existing LB foot fixtures perfectly.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a 1251 kgf max at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X80SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X80SLB replacement — usually within 7-8 hours.