This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100SN, 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 SI125X100SN
The AirTAC SI125 Standard Cylinder SI125X100SN 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 SAI125X100SN, 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 → SAI125X100SN
- 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 SI125X100SN
The AirTAC SI125X100SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 100 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X100SN, matching the interface, bore, stroke, force and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. The -N NBR seal handles -20 to +70 C, while Viton H extends this to 150 C.
Airtac SI125 Standard Cylinder SI125X100SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100SN |
| 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 SAI125X100SN 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 SAI125X100SN 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 SI125X100SN
| 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 SI125X100SN Is Used
Heavy Press Clamping
Generates 6136 N of push force at 0.5 MPa to secure heavy metalwork plates during machining and press operations.
Automated Welding Fixture
Moves substantial welding jigs through a 100 mm stroke, holding position reliably with NBR seals in industrial environments.
Pallet Stopper Gate
Acts as a high-force stop gate on heavy-duty roller conveyors, absorbing kinetic impact with its 32 mm piston rod.
Replacing the Airtac SI125 Standard Cylinder SI125X100SN with the SAI125X100SN
To replace the SI125X100SN, order the SAI125X100SN. Verify your ISO 15552 mounting interface, M27x2 rod thread, G1/2 port and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If you need more force than the 6136 N at 0.5 MPa (or 8590 N at 0.7 MPa), step up to a 160 mm bore; if less is required, a 100 mm bore provides 3927 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2 (A) or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100SN
- ✓ 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 SI125X100SN FAQ
Yes, the AirTAC SI125X100SN is discontinued. The direct replacement is the SAI125X100SN. It is dimensionally interchangeable per ISO 15552, retaining the exact same 125 mm bore, 100 mm stroke, 6136 N force, G1/2 port and mounting fixtures.
The 125 mm bore provides 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa it pushes 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed for this bore size is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100SN replacement — usually within 7-8 hours.