This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500TC, 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 SI125X500TC
The AirTAC SI125 Standard Cylinder SI125X500TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500TC
- 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 SI125X500TC
The AirTAC SI125X500TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 500 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X500TC, which shares the exact ISO 15552 mounting interface, TC trunnion accessory, and output force.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot accept a sensor; legacy CS1-B/DS1-B switches require an -S variant. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X500TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500TC |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500TC 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 SAI125X500TC 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 SI125X500TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500TC Is Used
Heavy Press Actuation
Drives large forming presses requiring 8590 N push force at 0.7 MPa, utilizing the 500 mm stroke to fully open and close heavy tooling platens.
Bulk Material Diversion
Actuates massive routing gates on aggregate or grain conveyors, where the robust 125 mm bore and TC trunnion mount withstand high inertial loads.
Replacing the Airtac SI125 Standard Cylinder SI125X500TC with the SAI125X500TC
To replace the SI125X500TC, order the SAI125X500TC. Confirm the ISO 15552 TC trunnion mounting, 500 mm stroke, G1/2 port, and M27x2 rod thread. Since this SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, specify an SAI125X500TC-S. When sizing, neighboring bores offer different forces: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. A plain cylinder drifts on air loss because the cushion only decelerates; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 500 mm stroke demands external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500TC
- ✓ 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 SI125X500TC FAQ
Yes, the SI125X500TC is discontinued. The direct replacement is the SAI125X500TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 500 mm stroke, G1/2 port, force, and TC trunnion mounting.
The 125 mm bore features a G1/2 air port and M27x2 rod thread. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a maximum theoretical force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500TC replacement — usually within 7-8 hours.