This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X35TC, 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 SI125X35TC
The AirTAC SI125 Standard Cylinder SI125X35TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 35mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X35TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X35TC
- 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 SI125X35TC
The AirTAC SI125X35TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 35 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X35TC, matching the interface, force, and TC trunnion mount.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike legacy CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125X35TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X35TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X35TC |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAI125X35TC 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 SAI125X35TC 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 SI125X35TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SI125X35TC Is Used
Heavy Press Clamping
Secures large automotive castings during machining using the 6136 N push force, taking advantage of the short 35 mm stroke for rapid high-force clamping cycles.
Pallet Diverting
Handles heavy-loaded pallets on packaging lines, using the robust 32 mm rod and TC trunnion mount to absorb side loads during heavy redirection tasks.
Replacing the Airtac SI125 Standard Cylinder SI125X35TC with the SAI125X35TC
To replace this SI with the SAI125X35TC, verify the ISO 15552 TC trunnion mount, 125 mm bore, 35 mm stroke, and G1/2 port (PT/G/NPT thread options). This non-magnet version cannot accept a sensor; order a magnet-equipped SAI if position detection is needed. For sizing, a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note: a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X35TC
- ✓ 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 SI125X35TC FAQ
Yes, the AirTAC SI125X35TC is discontinued. The direct replacement is the SAI125X35TC. It is a true ISO 15552 profile cylinder that matches the 125 mm bore, 35 mm stroke, 6136 N force, G1/2 port, and TC mounting interface, fitting directly into existing fixtures.
This 125 mm bore cylinder features a G1/2 air port and a 32 mm rod. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X35TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X35TC replacement — usually within 7-8 hours.