This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX260, 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 SI125BX260
The AirTAC SI125 Standard Cylinder SI125BX260 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 260mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX260, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX260
- 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 SI125BX260
The AirTAC SI125BX260 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 260mm stroke. Featuring a SUS304 stainless steel rod and G1/2 port, it delivers 6136N push force at 0.5MPa. The direct replacement is the SAI125BX260, matching the exact interface, bore, stroke, force and mounting.
Because this SKU lacks a magnet (-S), it cannot accept a position switch. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that the standard cushion only decelerates; use a pilot check valve or the SAIL/BSAI lock variant.
Airtac SI125 Standard Cylinder SI125BX260 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX260 |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAI125BX260 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 SAI125BX260 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 SI125BX260
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SI125BX260 Is Used
Heavy Press Clamping
Secures large metal stamping fixtures using 6136N of thrust at 0.5MPa, with the SUS304 rod resisting coolant corrosion.
Mold Ejection Systems
Ejects heavy industrial rubber or plastic molds, relying on the 40mm adjustable air cushions to decelerate the 32mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125BX260 with the SAI125BX260
To replace the SI125BX260, order the SAI125BX260. Verify the ISO 15552 mounting interface, 125mm bore, 260mm stroke, G1/2 port, and SUS304 rod. Sizing both ways: a 100mm bore yields 3927N push at 0.5MPa, while a 160mm bore yields 10053N. For this 260mm stroke, ensure guide alignment to prevent rod bending. This non-magnetic SKU cannot take a sensor; if needed, order an SAI with -S for CS1-B/DS1-B switches. For dead-load holding, select the SAIL lock or BSAI clamp-lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX260
- ✓ 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 SI125BX260 FAQ
Yes, the SI125BX260 is discontinued. The direct replacement is the SAI125BX260. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 260mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder has a G1/2 port. It delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a theoretical max of 1251 kgf at 1.0MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX260 replacement — usually within 7-8 hours.