This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX10, 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 SI125BX10
The AirTAC SI125 Standard Cylinder SI125BX10 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 SAI125BX10, 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 → SAI125BX10
- 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 SI125BX10
The AirTAC SI125BX10 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 10mm stroke. Delivering 6136N push force at 0.5MPa through a G1/2 port, it features a SUS304 stainless steel rod for corrosion resistance. Because this SKU lacks a magnet, it cannot accept position switches. The direct replacement is the SAI125BX10, maintaining identical mounting and force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL and BSAI lock variants absent from the SI line.
Airtac SI125 Standard Cylinder SI125BX10 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX10 |
| 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 SAI125BX10 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 SAI125BX10 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 SI125BX10
| 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 SI125BX10 Is Used
Short-Stroke Clamping
Applies high 6136N clamping force over a 10mm travel for securing heavy steel plates during machining operations.
Corrosive Ejecting
Leverages the SUS304 stainless rod to eject parts in wash-down zones without risking surface pitting or rust.
Heavy Pressing
Provides steady downward thrust for seating large bearings or aligning heavy structural components in jigs.
Replacing the Airtac SI125 Standard Cylinder SI125BX10 with the SAI125BX10
To replace the SI125BX10, order the SAI125BX10. It is a true ISO 15552 direct, matching the 125mm bore, 10mm stroke, G1/2 port, M27x2 rod thread, and 40mm cushions. The -B rod material (SUS304 stainless) carries over directly. Because this specific SKU has no -S suffix, it lacks a magnet and cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is required. If checking neighbouring bores, an 80mm bore yields 2513N push at 0.5MPa, while a 160mm bore yields 10053N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding on power loss, specify an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX10
- ✓ 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 SI125BX10 FAQ
Yes, the AirTAC SI125BX10 is discontinued. The direct replacement is the SAI125BX10. It shares the identical ISO 15552 mounting interface, 125mm bore, 10mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
It features a G1/2 port. The force ratings are: 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. Operating speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX10
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX10 replacement — usually within 7-8 hours.