This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X125STC, 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 SI100 Standard Cylinder SI100X125STC
The AirTAC Airtac SI100 Standard Cylinder SI100X125STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X125STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X125STC
- 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 SI100 Standard Cylinder SI100X125STC
The AirTAC SI100X125STC is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 125 mm stroke. It delivers 3927 N push force at 0.5 MPa and features a TC trunnion mount with a G1/2 port. The direct replacement is the SAI100X125STC, which matches the original bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix means this unit has a piston magnet for CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100X125STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X125STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X125STC |
| Bore size | Ø100 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100X125STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100X125STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100X125STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×125 | 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 SI100 Standard Cylinder SI100X125STC Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 3927 N push force to hold components rigidly against the cutting tool forces.
Pallet Diverting
Actuates a heavy-duty diverter arm on a packaging line, moving loaded pallets efficiently with a 125 mm stroke and TC trunnion mounting.
Replacing the Airtac SI100 Standard Cylinder SI100X125STC with the SAI100X125STC
To replace the SI100X125STC, order the SAI100X125STC. Confirm the ISO 15552 TC trunnion interface, 125 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. If you need more force, the neighboring 125 mm bore yields 6136 N push at 0.5 MPa; if less is required, the 80 mm bore provides 2513 N. Remember that a standard cylinder drifts without live air, as the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The 25 mm rod and M20x1.5 thread handle high side-loads, but for any stroke over 300 mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X125STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100X125STC FAQ
Yes, the SI100X125STC is discontinued. The direct replacement is the SAI100X125STC. It shares the identical ISO 15552 mounting interface, 100 mm bore, 125 mm stroke, force, G1/2 port, and TC trunnion mount, fitting directly into your existing fixtures.
This 100 mm bore cylinder uses a G1/2 air port. It generates a push force of 3927 N and a pull force of 3681 N at 0.5 MPa. At 0.7 MPa the push force is 5497 N, and at 0.9 MPa it is 7068 N. The theoretical maximum force is 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X125STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X125STC replacement — usually within 7-8 hours.