This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X160S, 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 SI125X160S
The AirTAC SI125 Standard Cylinder SI125X160S 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 SAI125X160S, 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 → SAI125X160S
- 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 SI125X160S
The AirTAC SI125X160S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 160 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X160S, matching the bore, stroke, force, port and ISO 15552 mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S SKU has a magnet for CS1-B/DS1-B sensors, while the SAI uses current switches. Viton H seals raise temps to 150 C.
Airtac SI125 Standard Cylinder SI125X160S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X160S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X160S |
| 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 SAI125X160S 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 SAI125X160S 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 SI125X160S
| 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 SI125X160S Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers, utilizing the 6136 N push force at 0.5 MPa to hold components rigidly against cutting loads.
Injection Molding Extraction
Drives robust robotic arms to extract molded parts from high-tonnage presses, relying on the 125 mm bore's 11045 N output at 0.9 MPa for reliable extraction.
Replacing the Airtac SI125 Standard Cylinder SI125X160S with the SAI125X160S
To replace the SI125X160S, order the SAI125X160S and confirm the ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, G1/2 port (PT/G/NPT) and mounting accessory. The -S magnet means it accepts CS1-B/DS1-B switches, while the SAI takes current AirTAC sensors. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, and a 160 mm bore gives 10053 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 160 mm stroke, rod bending is low, but for any stroke >=300 mm add a guide to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X160S
- ✓ 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 SI125X160S FAQ
Yes, the SI125X160S is discontinued. The direct replacement is the AirTAC SAI125X160S. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 160 mm stroke, output force, G1/2 port and mounting fixtures for a seamless swap.
This double-acting cylinder has a G1/2 air port, a 32 mm rod, and an M27x2 rod thread. Force output is 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 theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X160S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X160S replacement — usually within 7-8 hours.