This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X25STC, 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 SI100X25STC
The AirTAC SI100 Standard Cylinder SI100X25STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X25STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X25STC
- 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 SI100X25STC
The AirTAC SI100X25STC is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 25 mm stroke. It delivers 3927 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced it with the SAI100X25STC, a direct sharing the same TC trunnion mount, M20x1.5 rod thread, and 36 mm cushions. The SAI features an upgraded piston seal with two Y-shaped elements for lower start-up pressure, and introduces SAIL, SAIF, and BSAI lock variants the SI lacked.
The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors. Note that standard cylinders drift without live air; use a pilot check valve or SAIL lock for load holding.
Airtac SI100 Standard Cylinder SI100X25STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X25STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X25STC |
| Bore size | Ø100 mm |
| Stroke | 25 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 SAI100X25STC 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 SAI100X25STC 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 SI100X25STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×25 | 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 SI100X25STC Is Used
High-Force Clamping
Secures heavy steel plates in machining fixtures using 3927 N of thrust at 0.5 MPa within a compact 25 mm stroke.
Short-Stroke Ejection
Ejects dense molded parts from presses rapidly, utilizing the 30-800 mm/s speed range and robust 25 mm rod.
Press Insertion
Pushes bearings into housings via a TC trunnion mount that handles the 5497 N push force at 0.7 MPa without deflection.
Replacing the Airtac SI100 Standard Cylinder SI100X25STC with the SAI100X25STC
To replace the SI100X25STC, order the SAI100X25STC. Confirm the ISO 15552 TC trunnion mounting interface, 100 mm bore, 25 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. Sizing checks: if moving down, a 80 mm bore yields 2513 N push at 0.5 MPa; if moving up, a 125 mm bore yields 6136 N. This short 25 mm stroke avoids rod-bending side-load issues seen in longer strokes. A plain cylinder does not hold load on air loss; the cushions only decelerate. For static holding, specify an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X25STC
- ✓ 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 SI100X25STC FAQ
Yes, the SI100X25STC is discontinued. The direct replacement is the SAI100X25STC. It shares the same ISO 15552 interface, 100 mm bore, 25 mm stroke, G1/2 port, and TC mounting, fitting existing fixtures perfectly.
The G1/2 port bore delivers 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N at 0.9 MPa, and a maximum theoretical force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X25STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X25STC replacement — usually within 7-8 hours.