This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X800SCB, 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 SI125X800SCB
The AirTAC SI125 Standard Cylinder SI125X800SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 800mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X800SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X800SCB
- 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 SI125X800SCB
The AirTAC SI125X800SCB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 800 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, M27x2 rod thread, and a CB clevis mount. The direct replacement is the SAI125X800SCB, matching the bore, stroke, output, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line, and the Viton H seal option raises operating temperature to 150 C.
Airtac SI125 Standard Cylinder SI125X800SCB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X800SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X800SCB |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAI125X800SCB 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 SAI125X800SCB 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 SI125X800SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SI125X800SCB Is Used
Heavy Material Handling
Ideal for driving large bulk pallet lifts or heavy-duty transfer carriages requiring a 6136 N push force across an 800 mm travel distance.
Automated Press Clamping
Provides robust actuation for large press beds and heavy clamping stations, utilizing the 125 mm bore to secure substantial workpieces.
Logistics Sortation
Powers heavy parcel diverter arms and large-scale conveyor routing gates where a 313 kg vertical lift capacity is necessary.
Replacing the Airtac SI125 Standard Cylinder SI125X800SCB with the SAI125X800SCB
To replace the SI125X800SCB, order the SAI125X800SCB. Verify your ISO 15552 interface, 125 mm bore, 800 mm stroke, G1/2 port, and CB clevis mounting. The -S magnet means it accepts CS1-B/DS1-B legacy sensors, while the SAI replacement uses current AirTAC switches. Sizing context: a 100 mm bore yields 3927 N push at 0.5 MPa, and a 160 mm bore yields 10053 N. For a 125 mm bore, expect 30-500 mm/s speeds. Because this is an 800 mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X800SCB
- ✓ 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 SI125X800SCB FAQ
Yes, the SI125X800SCB is discontinued. The direct replacement is the SAI125X800SCB. It shares the identical ISO 15552 mounting interface, 125 mm bore, 800 mm stroke, G1/2 port, and CB clevis mount, fitting directly into existing fixtures.
The 125 mm bore features a G1/2 air port and M27x2 rod thread. It delivers 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 of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X800SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X800SCB replacement — usually within 7-8 hours.