This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X50STC, 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 SI100X50STC
The AirTAC Airtac SI100 Standard Cylinder SI100X50STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X50STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X50STC
- 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 SI100X50STC
The AirTAC SI100X50STC is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 50mm stroke. It delivers 3927 N push force at 0.5 MPa, features a G1/2 air port, and uses a TC trunnion mounting interface. AirTAC replaced this legacy unit with the SAI100X50STC, a direct upgrade retaining the exact ISO 15552 mounting dimensions, bore, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants absent in the SI line, including SAIL, SAIF, and BSAI models.
Airtac SI100 Standard Cylinder SI100X50STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X50STC |
| Bore size | Ø100 mm |
| Stroke | 50 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 SAI100X50STC 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 SAI100X50STC 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 SI100X50STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×50 | 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 SI100X50STC Is Used
Heavy-Duty Pressing
Applies up to 7068 N of push force at 0.9 MPa for seating bearings or assembling heavy mechanical components.
Pallet Diversion
Uses the TC trunnion mount to handle high lateral stress when actuating heavy diverters on packaging lines.
Replacing the Airtac SI100 Standard Cylinder SI100X50STC with the SAI100X50STC
To replace the SI100X50STC, order the SAI100X50STC and verify the ISO 15552 TC trunnion interface, 50mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors. If downsizing, the 80mm bore yields 2513 N push at 0.5 MPa; if upsizing, the 125mm bore provides 6136 N. Note that 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 offers the SAIF variant with a built-in 4M valve for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X50STC
- ✓ 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 SI100X50STC FAQ
Yes, the AirTAC SI100X50STC is discontinued. The direct replacement is the SAI100X50STC, which shares the identical ISO 15552 mounting interface, 100mm bore, 50mm stroke, output force, and G1/2 port.
It features a G1/2 air port. Force output is 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical maximum of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X50STC replacement — usually within 7-8 hours.