This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1800TC, 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 SI125X1800TC
The AirTAC SI125 Standard Cylinder SI125X1800TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1800mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1800TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1800TC
- 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 SI125X1800TC
The AirTAC SI125X1800TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1800 mm stroke. Because 1800 mm exceeds the 1500 mm standard maximum for this bore, it is a non-standard, made-to-order configuration. Generating a push force of 6136 N at 0.5 MPa, its direct replacement is the SAI125X1800TC, which preserves the exact ISO 15552 mounting interface, G1/2 port, and TC trunnion mount.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for extended lifespan and low start-up pressure. As this specific SI SKU lacks the -S magnet suffix, it cannot accept a position sensor.
Airtac SI125 Standard Cylinder SI125X1800TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1800TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1800TC |
| Bore size | Ø125 mm |
| Stroke | 1800 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 SAI125X1800TC 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 SAI125X1800TC 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 SI125X1800TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1800 | 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 SI125X1800TC Is Used
Long-Stroke Material Transfer
Drives heavy pallets across extended automated assembly lines, utilizing the 1800 mm stroke to span wide machinery gaps.
High-Reach Vertical Elevation
Lifts substantial loads of up to 313 kg in mezzanine access systems, relying on the 6136 N thrust at 0.5 MPa.
Large-Scale Press Demolding
Extracts bulky molded components from industrial presses, taking advantage of the 125 mm bore's 1251 kgf maximum output.
Replacing the Airtac SI125 Standard Cylinder SI125X1800TC with the SAI125X1800TC
To replace the SI125X1800TC, order the SAI125X1800TC, matching the 125 mm bore, 1800 mm stroke, G1/2 port, and TC trunnion mounting interface. When sizing, neighboring bores offer alternatives: the 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Note that 1800 mm exceeds the 1500 mm standard stroke limit, requiring a made-to-order unit; at this extended length, you must use external guides to prevent rod bending and side-load damage. A standard cylinder drifts without live air, so for load holding, integrate an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1800TC
- ✓ 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 SI125X1800TC FAQ
Yes, the SI125X1800TC is discontinued. The direct replacement is the SAI125X1800TC, which maintains the identical ISO 15552 mounting interface, bore, stroke, port, and force.
It features a G1/2 port. The force 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1800TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1800TC replacement — usually within 7-8 hours.