This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX160STC, 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 SI125BX160STC
The AirTAC SI125 Standard Cylinder SI125BX160STC 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 SAI125BX160STC, 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 → SAI125BX160STC
- 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 SI125BX160STC
The AirTAC SI125BX160STC is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 160mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is SAI125BX160STC, featuring the same ISO 15552 mounting interface, TC trunnion mount, and SUS304 stainless steel rod.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds BSAI clamp-lock and SAIL air-released lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX160STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX160STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX160STC |
| 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 SAI125BX160STC 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 SAI125BX160STC 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 SI125BX160STC
| 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 SI125BX160STC Is Used
Heavy Press Systems
Applies 6136N of thrust at 0.5MPa for forming and stamping operations, utilizing the SUS304 rod in corrosive environments.
Pallet Positioning
Shifts heavy loads with a 313kg vertical lift capacity, relying on the TC trunnion mount to accommodate angular alignment.
Bulk Material Diversion
Actuates large gauge gates at 30-500mm/s, with the 40mm adjustable air cushions decelerating the payload smoothly.
Replacing the Airtac SI125 Standard Cylinder SI125BX160STC with the SAI125BX160STC
To replace the SI125BX160STC, order the SAI125BX160STC. Verify the ISO 15552 TC trunnion interface, 160mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B legacy sensors (the SAI uses current AirTAC switches). The -B code specifies the SUS304 rod; default is carbon steel. If sizing up or down, adjacent bores are 100mm (3927N push @0.5MPa) and 160mm (10053N push @0.5MPa). A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 160mm stroke, side-load is low, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX160STC
- ✓ 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 SI125BX160STC FAQ
Yes, the SI125BX160STC is discontinued. The direct replacement is the SAI125BX160STC. It shares the same ISO 15552 interface, 125mm bore, 160mm stroke, G1/2 port, TC mount, and SUS304 rod, fitting existing fixtures perfectly.
It features a G1/2 port. The force ratings are: 6136N push and 5734N pull at 0.5MPa; 8590N push at 0.7MPa; 11045N push at 0.9MPa; and a theoretical max of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX160STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX160STC replacement — usually within 7-8 hours.