This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX30, 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 SI125BX30
The AirTAC Airtac SI125 Standard Cylinder SI125BX30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX30
- 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 SI125BX30
The AirTAC SI125BX30 is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 30 mm stroke. It delivers 6136 N push force at 0.5 MPa and uses a G1/2 air port. The direct replacement is the SAI125BX30, which matches the original bore, stroke, force, port, and ISO 15552 mounting interface for a seamless fixture retrofit.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI125BX30 variant uses a SUS304 stainless steel rod for corrosion resistance, but lacks a magnet so it cannot accept position switches. For load holding, note that standard cushions only decelerate; use an external pilot check valve or the SAIL lock variant.
Airtac SI125 Standard Cylinder SI125BX30 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX30 |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125BX30 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 SAI125BX30 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 SI125BX30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125BX30 Is Used
Heavy Stamping
Provides robust 6136 N push force at 0.5 MPa for holding heavy metalwork blanks during stamping operations.
Mold Clamping
The SUS304 stainless rod resists shop-floor corrosion while delivering reliable clamping force to rubber molding fixtures.
Pallet Positioning
Short 30 mm stroke handles high-force indexing and stopping of loaded pallets on transfer lines without side-load risk.
Replacing the Airtac SI125 Standard Cylinder SI125BX30 with the SAI125BX30
To replace the SI125BX30, order the SAI125BX30 and confirm the ISO 15552 mounting interface, 125 mm bore, 30 mm stroke, and G1/2 port. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the magnet option. For sizing down, a 100 mm bore offers 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Remember that a plain cylinder drifts without live air—the cushion only decelerates. For secure load holding, consider the SAIL or BSAI lock variants, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX30
- ✓ 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 SI125BX30 FAQ
Yes, the SI125BX30 is discontinued. The direct replacement is the SAI125BX30. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 30 mm stroke, 6136 N force, G1/2 port, and mounting interface.
This 125 mm bore cylinder uses a G1/2 port. It generates 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX30 replacement — usually within 7-8 hours.