This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX350SH, 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 SI125BX350SH
The AirTAC SI125 Standard Cylinder SI125BX350SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX350SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX350SH
- 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 SI125BX350SH
The AirTAC SI125BX350SH is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod and Viton H high-temperature seals (0 to 150 C). Delivering 6136 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI125BX350SH.
The SAI125BX350SH is a direct upgrade retaining the exact 125 mm bore, 350 mm stroke, and ISO 15552 mounting interface. It features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
Airtac SI125 Standard Cylinder SI125BX350SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX350SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX350SH |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125BX350SH 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 SAI125BX350SH 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 SI125BX350SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SI125BX350SH Is Used
Heavy Stamp Press Feed
Drives robust 313 kg vertical lift tooling in hot environments using the Viton H seal and SUS304 rod.
High-Temp Ejection
Ejects formed parts near 150 C ovens, relying on 6136 N thrust and the stainless rod for corrosion resistance.
Pallet Diverting
Shifts heavy pallets laterally over 350 mm, requiring external guides to manage side-load and prevent rod bending.
Replacing the Airtac SI125 Standard Cylinder SI125BX350SH with the SAI125BX350SH
To replace the SI125BX350SH, order the SAI125BX350SH to match the ISO 15552 mounting interface, 350 mm stroke, G1/2 port, and magnet for CS1-B/DS1-B switches. The SAI family adds SAIL and BSAI lock variants, as a plain cylinder drifts without air and the cushion only decelerates. For 350 mm strokes, use external guides to prevent rod bending. Neighbouring bores: 100 mm yields 3927 N push at 0.5 MPa; 160 mm yields 10053 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX350SH
- ✓ 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 SI125BX350SH FAQ
Yes, the SI125BX350SH is discontinued. The direct replacement is the SAI125BX350SH. It shares the same ISO 15552 mounting interface, 125 mm bore, 350 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
It has a G1/2 port. Force output is 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 max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX350SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX350SH replacement — usually within 7-8 hours.