This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X267SN, 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 SI125X267SN
The AirTAC SI125 Standard Cylinder SI125X267SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 267mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X267SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke267 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X267SN
- 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 SI125X267SN
The AirTAC SI125X267SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 267 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X267SN, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It also adds SAIL and BSAI lock variants the SI lacked. The NBR seal handles -20 to +70 C, while Viton H extends this to 150 C.
Airtac SI125 Standard Cylinder SI125X267SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X267SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X267SN |
| Bore size | Ø125 mm |
| Stroke | 267 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 SAI125X267SN 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 SAI125X267SN 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 SI125X267SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×267 | 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 SI125X267SN Is Used
Heavy Press Clamping
Generates 6136 N of thrust at 0.5 MPa to secure heavy metal workpieces in machining and press fixtures.
Industrial Door Actuation
Moves large industrial safety doors and heavy gates using the robust 32 mm piston rod and 125 mm bore power.
Replacing the Airtac SI125 Standard Cylinder SI125X267SN with the SAI125X267SN
To replace the SI125X267SN, order the SAI125X267SN. Confirm the ISO 15552 mounting interface, 125 mm bore, 267 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. The -S magnet works with legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. The -N NBR seal is standard. At 6136 N push @0.5 MPa, neighbouring bores are 100 mm (3927 N) and 160 mm (10053 N). For load holding, note a plain cylinder drifts on air loss; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Since the stroke is under 300 mm, severe rod-bending side loads are less critical, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X267SN
- ✓ 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 SI125X267SN FAQ
Yes, the AirTAC SI125X267SN is discontinued. The direct replacement is the SAI125X267SN. It is dimensionally interchangeable per ISO 15552, offering the same 125 mm bore, 267 mm stroke, 6136 N force, G1/2 port, and mounting interface.
This 125 mm bore cylinder uses a G1/2 air port. The thrust ratings are: 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 maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X267SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X267SN replacement — usually within 7-8 hours.