This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X835, 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 SI125X835
The AirTAC SI125 Standard Cylinder SI125X835 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 835mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X835, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke835 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X835
- 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 SI125X835
The AirTAC SI125X835 is a discontinued double-acting ISO 15552 profile cylinder with an 835 mm stroke and a 125 mm bore, delivering 6136 N push force at 0.5 MPa. Because this legacy unit is end-of-life, you should order the SAI125X835 direct replacement. It shares the exact ISO 15552 mounting interface, stroke, force, G1/2 port, and M27x2 rod thread, fitting your existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SKU lacks a magnet (-S), meaning it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X835 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X835 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X835 |
| Bore size | Ø125 mm |
| Stroke | 835 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 SAI125X835 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 SAI125X835 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 SI125X835
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×835 | 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 SI125X835 Is Used
Heavy Pallet Transfer
Shifts loaded pallets along a high-throughput line, using the 6136 N push force to overcome rolling friction over an 835 mm travel distance.
Large Crate Pusher
Indexes heavy shipping crates from an accumulation zone, relying on the 125 mm bore and external guides to maintain straight pushing over the long stroke.
Replacing the Airtac SI125 Standard Cylinder SI125X835 with the SAI125X835
To replace the SI125X835, order the SAI125X835 and verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/2 port, and M27x2 rod thread. Because this 835 mm stroke exceeds 300 mm, you must account for rod bending and side loads—use external guides to prevent jackknifing. Sizing both ways: if you need less force, the 100 mm bore offers 3927 N push at 0.5 MPa; if you need more, the 160 mm bore provides 10053 N. A plain cylinder drifts on air loss (the 40 mm cushions only decelerate), so for load holding consider an external pilot check valve, or explore the SAIL or BSAI lock variants. This non-magnetic SKU cannot support position sensing.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X835
- ✓ 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 SI125X835 FAQ
Yes, the SI125X835 is discontinued. The direct replacement is the SAI125X835. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 835 mm stroke, output force, G1/2 port, and mounting compatibility.
This 125 mm bore cylinder features a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X835
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X835 replacement — usually within 7-8 hours.