This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX160, 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 SI125BX160
The AirTAC SI125 Standard Cylinder SI125BX160 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 160mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX160, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke160 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX160
- 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 SI125BX160
The AirTAC SI125BX160 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 160 mm stroke. Built with a SUS304 stainless piston rod for corrosion resistance, it delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125BX160, matching the ISO 15552 mounting interface, bore, stroke, G1/2 port and force. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Because this SKU lacks a magnet, it cannot take a sensor. Note the air cushion only decelerates; it does not hold load on air loss. For that, use the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125BX160 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX160 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX160 |
| Bore size | Ø125 mm |
| Stroke | 160 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 SAI125BX160 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 SAI125BX160 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 SI125BX160
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×160 | 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 SI125BX160 Is Used
Heavy Press Operations
Drives substantial forming and stamping presses requiring up to 11045 N of thrust at 0.9 MPa, utilizing the SUS304 rod in corrosive shop environments.
Large Mold Clamping
Secures oversized injection molds using the 160 mm stroke, benefiting from the adjustable 40 mm air cushions at both ends to decelerate heavy masses.
Replacing the Airtac SI125 Standard Cylinder SI125BX160 with the SAI125BX160
To replace the SI125BX160, order the SAI125BX160. Confirm the ISO 15552 mounting interface, the 160 mm stroke, the G1/2 port (PT/G/NPT thread options) and your mounting accessory. This SKU has no magnet (-S), so it cannot accept a CS1-B/DS1-B sensor; order an -S version if sensing is needed. The 125 mm bore yields 6136 N push at 0.5 MPa; if less force is acceptable, step down to an 80 mm bore (2513 N). For load holding on air loss, the cushion will not lock the piston—select the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX160
- ✓ 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 SI125BX160 FAQ
Yes, the SI125BX160 is discontinued. The direct replacement is the SAI125BX160. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 160 mm stroke, G1/2 port, output force and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
This double-acting cylinder has a 32 mm SUS304 rod, M27x2 thread, G1/2 port, 40 mm cushions, and operates at 30-500 mm/s. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX160
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX160 replacement — usually within 7-8 hours.