This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X115, 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 SI125X115
The AirTAC SI125 Standard Cylinder SI125X115 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 SAI125X115, 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 → SAI125X115
- 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 SI125X115
The AirTAC SI125X115 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 via a G1/2 port. As an end-of-line unit, it is superseded by the SAI125X115 direct replacement, which matches the exact mounting interface, output, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note this non-magnetic SKU cannot accept a sensor; legacy -S versions used CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125X115 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X115 |
| 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 SAI125X115 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 SAI125X115 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 SI125X115
| 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 SI125X115 Is Used
Heavy Press Operations
Drives high-tonnage stamping and forming presses, utilizing the 6136 N push force at 0.5 MPa to deform thick materials reliably.
Mold Clamping Fixtures
Secures heavy industrial molds and dies in place during machining, using the robust 32 mm rod and M27x2 thread for rigid holding.
Replacing the Airtac SI125 Standard Cylinder SI125X115 with the SAI125X115
To replace the SI125X115, order the SAI125X115 keeping the identical 125 mm bore, 115 mm stroke, G1/2 port, and ISO 15552 mounting accessories. If sizing up or down, adjacent bores are 100 mm and 160 mm, offering 3927 N and 10053 N push at 0.5 MPa respectively. This plain cylinder lacks a magnet and cannot take a sensor; if position detection is needed, select a current SAI model with an -S suffix. Because the stroke is 115 mm, side-load rod-bending is minimal, but always guide the load. For load holding on air loss, note the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X115
- ✓ 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 SI125X115 FAQ
Yes, the AirTAC SI125X115 is discontinued. The direct replacement is the SAI125X115, which shares the identical ISO 15552 mounting interface, 125 mm bore, 115 mm stroke, force, and G1/2 port, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/2 air port. It provides 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X115 replacement — usually within 7-8 hours.