This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX140, 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 SI125BX140
The AirTAC SI125 Standard Cylinder SI125BX140 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX140, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX140
- 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 SI125BX140
The AirTAC SI125BX140 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 140 mm stroke. Built with an extruded aluminium barrel and a SUS304 stainless piston rod, it delivers 6136 N push force at 0.5 MPa through a G1/2 port. Because the SI line is end-of-life, you should order the direct replacement SAI125BX140, which matches the exact bore, stroke, force, port and ISO 15552 mounting interface.
The SAI125BX140 upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S), meaning it cannot accept position sensors. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the legacy SI range.
Airtac SI125 Standard Cylinder SI125BX140 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX140 |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125BX140 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 SAI125BX140 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 SI125BX140
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125BX140 Is Used
Heavy-Duty Pressing
Drives large stamping or forming dies requiring high thrust, utilizing the 6136 N push force at 0.5 MPa to seat components firmly.
Pallet Handling
Indexes heavy loaded pallets on roller conveyors where the robust 125 mm bore and SUS304 rod withstand harsh industrial environments.
Replacing the Airtac SI125 Standard Cylinder SI125BX140 with the SAI125BX140
To replace the SI125BX140, order the SAI125BX140. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 140 mm stroke, M27x2 rod thread and G1/2 port. Confirm your mounting accessory (LB, FA, TC) and thread standard (PT, G, NPT). Since this SKU has no magnet, it cannot support sensing; if you need switches, select an SAI model with the S suffix. For sizing, a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder does not hold load without live air; for holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX140
- ✓ 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 SI125BX140 FAQ
Yes, the AirTAC SI125BX140 is discontinued. The direct replacement is the SAI125BX140. It features the same ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, G1/2 port and output force, fitting directly into existing fixtures.
This 125 mm bore cylinder uses a G1/2 port. The thrust ratings are 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX140 replacement — usually within 7-8 hours.