This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600FB, 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 SI125X600FB
The AirTAC SI125 Standard Cylinder SI125X600FB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X600FB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X600FB
- 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 SI125X600FB
The AirTAC SI125X600FB is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 600 mm stroke. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X600FB, retaining the same FB flange mount, G1/2 port, and output. This SKU lacks a magnet (-S), so it cannot accept a position sensor.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. The SAI family also adds BSAI clamp-lock and SAIL air-released lock variants absent in the legacy line.
Airtac SI125 Standard Cylinder SI125X600FB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600FB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600FB |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125X600FB 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 SAI125X600FB 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 SI125X600FB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125X600FB Is Used
Heavy Stamping Press
Drives large tooling dies with 6136 N push at 0.5 MPa, relying on the FB flange to absorb heavy shock during metal forming.
Pallet Diverting
Extends 600 mm to push heavy pallets off a high-throughput line, requiring external guides to prevent rod bending over the long stroke.
Material Lift Gate
Actuates large loading dock gates; use an external pilot check valve because the standard cylinder will not hold the gate vertically without air.
Replacing the Airtac SI125 Standard Cylinder SI125X600FB with the SAI125X600FB
To replace the SI125X600FB, order the SAI125X600FB. Verify the ISO 15552 interface, 125 mm bore, 600 mm stroke, G1/2 port, and FB flange mounting. Because this is a non-magnetized SKU, it cannot support legacy CS1-B/DS1-B sensors; order an -S suffix if sensing is required. If sizing alternatives, neighbouring bores (100 mm or 160 mm) shift the 0.5 MPa push force down to 3927 N or up to 10053 N. Note that a 600 mm stroke demands external guide rails to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding, specify an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600FB
- ✓ 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 SI125X600FB FAQ
Yes, the SI125X600FB is discontinued. The direct replacement is the SAI125X600FB. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 600 mm stroke, FB flange, and G1/2 port exactly.
It features a G1/2 air 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600FB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600FB replacement — usually within 7-8 hours.