This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX1000, 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 SI125BX1000
The AirTAC SI125 Standard Cylinder SI125BX1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1000mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1000 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX1000
- 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 SI125BX1000
The AirTAC SI125BX1000 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1000 mm stroke. It delivers 6136 N push force at 0.5 MPa, features a SUS304 stainless steel piston rod (B option), and uses a G1/2 port. Because this SKU lacks a magnet, it cannot accept position sensors.
You must order the direct replacement SAI125BX1000. It shares the exact ISO 15552 mounting interface, bore, stroke, force, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. For load holding, note that air cushions only decelerate; use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI125 Standard Cylinder SI125BX1000 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX1000 |
| Bore size | Ø125 mm |
| Stroke | 1000 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 SAI125BX1000 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 SAI125BX1000 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 SI125BX1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1000 | 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 SI125BX1000 Is Used
Pallet Diversion
Actuates large diverter arms over extended conveyor sections, using the 125 mm bore's 5734 N pull force to reposition heavy pallets.
Replacing the Airtac SI125 Standard Cylinder SI125BX1000 with the SAI125BX1000
To replace the SI125BX1000, order the SAI125BX1000. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port, and the 1000 mm stroke. This non-magnetic SKU cannot take sensors; if you need position detection, select an SAI with the S magnet option for current AirTAC switches. Sizing both ways: a 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while a 160 mm bore offers 10053 N. For the 1000 mm stroke, use external guides to prevent rod bending and side-load damage. The cushion only decelerates; for held loads use a pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX1000
- ✓ 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 SI125BX1000 FAQ
Yes, the SI125BX1000 is discontinued. The direct replacement is the SAI125BX1000. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1000 mm stroke, G1/2 port, and mounting interface, but adds an upgraded two Y-shaped element piston seal.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s. It uses a G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX1000 replacement — usually within 7-8 hours.