This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100TC, 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 SI125X100TC
The AirTAC SI125 Standard Cylinder SI125X100TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100TC
- 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 SI125X100TC
The AirTAC SI125X100TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 100 mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced by the direct replacement SAI125X100TC, which retains the exact TC trunnion mount, G1/2 port, and output force. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
This non-magnet SKU cannot accept a sensor. For high heat, Viton H seals raise the limit to 150 C. Note the air cushion only decelerates; it does not hold load.
Airtac SI125 Standard Cylinder SI125X100TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100TC |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125X100TC 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 SAI125X100TC 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 SI125X100TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125X100TC Is Used
Heavy Press Stamping
Drives large forming dies requiring high thrust, using the 6136 N push force at 0.5 MPa to deform thick plate metal securely.
Pallet Actuated Gates
Shifts heavy loaded pallet stops via the TC trunnion mount, absorbing lateral moments during high-inertia routing.
Injection Mold Clamping
Secures large mold halves with a 313 kg vertical lift capacity, relying on the 40 mm adjustable cushion for smooth end-of-stroke deceleration.
Replacing the Airtac SI125 Standard Cylinder SI125X100TC with the SAI125X100TC
To replace the SI125X100TC, order the SAI125X100TC. It drops into existing fixtures via the identical ISO 15552 mounting interface and TC trunnion accessory, maintaining the 125 mm bore, 100 mm stroke, M27x2 rod thread, and G1/2 port. Confirm you do not need position sensing, as this no-S SKU lacks a magnet. If sizing alternatives, a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore offers 10053 N. For load holding on air loss, add an external pilot check valve or rod lock, as the cushion only decelerates. The SAI family also adds SAIL and BSAI lock variants if brake mounting is required.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100TC
- ✓ 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 SI125X100TC FAQ
Yes, the SI125X100TC is discontinued. The direct replacement is the SAI125X100TC. It features the same ISO 15552 mounting interface, 125 mm bore, 100 mm stroke, G1/2 port, and TC trunnion mount, but upgrades to a two Y-shaped one-way piston seal for lower start-up pressure.
It has a G1/2 air 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 theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100TC replacement — usually within 7-8 hours.