This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX115, 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 SI125AX115
The AirTAC SI125 Standard Cylinder SI125AX115 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 115mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX115, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX115
- 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 SI125AX115
The AirTAC SI125AX115 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 115 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125AX115, which maintains the exact same ISO 15552 mounting interface, bore, stroke, output force, G1/2 port, and accessories. The SAI upgrade introduces an improved piston seal featuring two Y-shaped one-way elements for lower start-up pressure and longer service life.
This specific SKU includes a SUS420J2 stainless steel piston rod (the -A option) for corrosion resistance, but lacks a magnet, meaning it cannot accept legacy CS1-B/DS1-B sensors. Note that a standard cylinder cannot hold a load without live air; the cushions only decelerate the piston near the stroke ends.
Airtac SI125 Standard Cylinder SI125AX115 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX115 |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAI125AX115 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 SAI125AX115 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 SI125AX115
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SI125AX115 Is Used
Heavy Stamp Pressing
Ideal for driving heavy stamping dies, utilizing the 6136 N push force at 0.5 MPa to form thick metal components reliably.
Robotic Clamp Jigs
Secures large fabricated steel frames during welding operations, benefiting from the corrosion-resistant SUS420J2 rod in humid shops.
Replacing the Airtac SI125 Standard Cylinder SI125AX115 with the SAI125AX115
To replace the discontinued SI125AX115, order the SAI125AX115. Verify your existing fixture's ISO 15552 mounting interface, the 115 mm stroke, and the G1/2 port. Confirm your mounting accessory (such as LB foot or TC trunnion) and remember this non-magnetic SKU cannot support position sensing. If sizing up or down, neighboring bores are 100 mm and 160 mm; at 0.5 MPa, this 125 mm bore provides 6136 N push and 5734 N pull. Because the stroke is under 300 mm, severe rod-bending side loads are less critical, but always guide the load. For applications requiring load holding on air loss, the standard cylinder will drift; use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX115
- ✓ 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 SI125AX115 FAQ
Yes, the AirTAC SI125AX115 is discontinued. The direct replacement is the SAI125AX115. It is dimensionally interchangeable per ISO 15552, offering the exact same 125 mm bore, 115 mm stroke, force, G1/2 port, and mounting interface.
This double-acting cylinder features a G1/2 air port. The thrust ratings are 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 force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX115 replacement — usually within 7-8 hours.