This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X10, 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 SI125X10
The AirTAC SI125 Standard Cylinder SI125X10 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 10mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X10, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke10 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X10
- 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 SI125X10
The AirTAC SI125X10 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 10mm stroke, delivering 6136N push force at 0.5MPa via a G1/2 port. As this legacy series ended production, AirTAC specifies the SAI125X10 as the direct replacement. It shares the same ISO 15552 mounting interface, M27x2 rod thread, and 40mm cushions, dropping directly into existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. For load holding, note that a standard cylinder drifts without live air; use the SAIL or BSAI lock variants if needed. Since this SKU lacks a magnet, it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X10 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X10 |
| Bore size | Ø125 mm |
| Stroke | 10 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 SAI125X10 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 SAI125X10 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 SI125X10
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×10 | 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 SI125X10 Is Used
Heavy Stamping Ejection
Provides a robust 6136N push at 0.5MPa to eject thick metal blanks from stamping presses, utilizing the short 10mm stroke for rapid, high-force ejection cycles.
Industrial Clamping Jigs
Secures heavy cast iron components during machining operations. The 125mm bore delivers reliable holding power, while the ISO 15552 profile barrel withstands harsh shop environments.
Short-Stroke Pressing
Applies steady downward thrust for seating large bearings or bushings into housings, leveraging the 11045N available at 0.9MPa within a compact 10mm travel limit.
Replacing the Airtac SI125 Standard Cylinder SI125X10 with the SAI125X10
To replace the discontinued SI125X10, order the SAI125X10, confirming the ISO 15552 mounting interface, 125mm bore, 10mm stroke, and G1/2 port (PT/G/NPT thread options). Because this specific SKU has no -S magnet, it cannot support position sensing; order the -S version if CS1-B/DS1-B switches are required. When sizing, the 125mm bore yields 6136N push at 0.5MPa; dropping to an 80mm bore gives 2513N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates—so specify a SAIL air-released lock, BSAI clamp-lock, or external pilot check valve for vertical loads. Operating speed is 30-500mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X10
- ✓ 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 SI125X10 FAQ
Yes, the SI125X10 is discontinued. The direct replacement is the AirTAC SAI125X10. It features the same ISO 15552 mounting interface, 125mm bore, 10mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 125mm bore features a G1/2 air port and M27x2 rod thread. At 0.5MPa it provides 6136N push and 5734N pull force. At 0.7MPa push is 8590N, and at 0.9MPa it is 11045N. The theoretical maximum force is 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X10
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X10 replacement — usually within 7-8 hours.