This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX100, 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 SI125AX100
The AirTAC SI125 Standard Cylinder SI125AX100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX100
- 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 SI125AX100
The AirTAC SI125AX100 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 100mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125AX100, matching the bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific SKU lacks a magnet (-S), so it cannot accept a CS1-B/DS1-B sensor. It uses a SUS420J2 stainless rod (A suffix).
Airtac SI125 Standard Cylinder SI125AX100 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX100 |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125AX100 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 SAI125AX100 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 SI125AX100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125AX100 Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers, utilizing the 6136N push force at 0.5MPa to prevent movement during heavy milling operations.
Mold Ejection Systems
Drives ejection pins in injection molding machinery where the robust 32mm SUS420J2 stainless rod withstands repetitive high-impact ejection cycles.
Pallet Stopper Gates
Acts as a heavy-duty pneumatic stop in high-throughput conveyor lines, reliably halting loaded pallets using its 11045N push force at 0.9MPa.
Replacing the Airtac SI125 Standard Cylinder SI125AX100 with the SAI125AX100
To replace the SI125AX100, order the SAI125AX100. Confirm the ISO 15552 mounting interface, 125mm bore, 100mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. Because this SKU lacks a magnet, it cannot take a sensor; if sensing is needed, order an SAI with the S suffix for CS1-B/DS1-B switches. The SUS420J2 stainless rod suits corrosive settings. For sizing, neighbours are 100mm (3927N [email protected]) and 160mm (10053N). A plain cylinder drifts on air loss; for load holding use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX100
- ✓ 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 SI125AX100 FAQ
Yes, the SI125AX100 is discontinued. The direct replacement is the SAI125AX100. It is dimensionally interchangeable per ISO 15552, keeping the same 125mm bore, 100mm stroke, 6136N force, G1/2 port and mounting interface.
This double-acting cylinder has a G1/2 port. It delivers 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 SAI125AX100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX100 replacement — usually within 7-8 hours.