This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX700, 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 SI125BX700
The AirTAC Airtac SI125 Standard Cylinder SI125BX700 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX700, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX700
- 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 SI125BX700
The AirTAC SI125BX700 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 700 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125BX700, matching the exact bore, stroke, force, port and ISO 15552 mounting interface.
This SKU features a SUS304 stainless steel rod for corrosion resistance. It lacks a magnet, so it cannot take a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure.
Airtac SI125 Standard Cylinder SI125BX700 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX700 |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAI125BX700 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 SAI125BX700 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 SI125BX700
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SI125BX700 Is Used
Heavy Stamping
Drives large press dies requiring 6136 N push force at 0.5 MPa with a 700 mm stroke.
Pallet Handling
Shifts heavy pallets in automated warehouses using the SUS304 rod for corrosion resistance.
Large Fixture Actuation
Actuates oversized machining fixtures where a 125 mm bore and 700 mm travel are essential.
Replacing the Airtac SI125 Standard Cylinder SI125BX700 with the SAI125BX700
To replace the SI125BX700, order the SAI125BX700. Confirm the ISO 15552 mounting interface, 700 mm stroke, G1/2 port, and M27x2 rod thread. This unit has no magnet (-S) and cannot accept a CS1-B/DS1-B sensor. Sizing options: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, use an external rod lock or pilot check valve, as cushions only decelerate. At 700 mm stroke, use external guides to prevent rod bending. For lock or valve needs, consider SAIL or BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX700
- ✓ 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 SI125BX700 FAQ
Yes, the SI125BX700 is discontinued. The direct replacement is the SAI125BX700, offering the same ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, force, and G1/2 port.
It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a 1251 kgf max at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX700 replacement — usually within 7-8 hours.