This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X180TC, 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 SI125X180TC
The AirTAC SI125 Standard Cylinder SI125X180TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 180mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X180TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X180TC
- 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 SI125X180TC
The AirTAC SI125X180TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 180 mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa, operating through a G1/2 port. Because this legacy unit is end-of-life, you should order the SAI125X180TC direct replacement. It shares the exact same TC trunnion mounting interface, M27x2 rod thread, and output force, fitting your existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for lower start-up pressure and extended life. Note that this specific SI SKU lacks a magnet, so it cannot accept position switches like the legacy CS1-B/DS1-B sensors. If high-temperature operation is needed, both series support a Viton H seal upgrade.
Airtac SI125 Standard Cylinder SI125X180TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X180TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X180TC |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAI125X180TC 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 SAI125X180TC 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 SI125X180TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SI125X180TC Is Used
Heavy Stamping Press
Drives large platens and dies requiring 6136 N push force at 0.5 MPa, utilizing the 180 mm stroke to actuate heavy forming mechanisms.
Pallet Actuation Gate
Shifts loaded pallet stops and heavy diversion gates on conveyor lines, benefiting from the TC trunnion mount to handle mid-stroke pivoting loads.
Large Component Ejection
Ejects molded or machined parts from industrial machinery, safely moving loads up to 3682 N without exceeding safe working limits.
Replacing the Airtac SI125 Standard Cylinder SI125X180TC with the SAI125X180TC
To replace the discontinued SI125X180TC, order the SAI125X180TC. Confirm the ISO 15552 TC trunnion mounting, 125 mm bore, 180 mm stroke, and G1/2 port (available in PT, G, or NPT). Since this SKU has no -S magnet, it cannot support sensors; if position detection is required, switch to an SAI125X180S equivalent. When sizing, a 100 mm bore provides 3927 N push at 0.5 MPa, while a 160 mm bore offers 10053 N. A plain cylinder does not hold load without live air—the cushion only decelerates. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. With a 180 mm stroke, side-load is minimal, but always ensure the TC trunnion pivots freely to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X180TC
- ✓ 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 SI125X180TC FAQ
Yes, the AirTAC SI125X180TC is discontinued. The direct replacement is the SAI125X180TC. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 180 mm stroke, G1/2 port, TC trunnion mount, and output force.
It features a G1/2 port, M27x2 rod thread, and 32 mm rod. 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 theoretical maximum of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X180TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X180TC replacement — usually within 7-8 hours.