This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X280STC, 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 SI80 Standard Air Cylinder SI80X280STC
The AirTAC SI80 Standard Air Cylinder SI80X280STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 280mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X280STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke280 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X280STC
- 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 SI80 Standard Air Cylinder SI80X280STC
The AirTAC SI80X280STC is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, adjustable air cushions, and a built-in magnet for position sensing. In this 80 mm bore class it delivers 2513 N push and 2268 N pull at 0.5 MPa, utilizing a G3/8 port and an M20x1.5 rod thread. The direct replacement is the SAI80X280STC, which retains the identical TC trunnion mounting, 280 mm stroke, and output force.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and longer service life. For applications needing load holding on air loss, the plain cylinder drifts because the cushion only decelerates near stroke end; you would need an external pilot check valve or the SAIL/BSAI lock variants the SI line lacked.
Airtac SI80 Standard Air Cylinder SI80X280STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X280STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X280STC |
| Bore size | Ø80 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 SAI80X280STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80X280STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80X280STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×280 | 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 SI80 Standard Air Cylinder SI80X280STC Is Used
Mid-Tonnage Pressing
Applies 2513 N of push force at 0.5 MPa for seating bearings, stamping light sheet metal, or clinching components in automated machining cells.
Pallet Diversion
Uses the TC trunnion mount to pivot a 280 mm stroke stopper or routing gate, handling heavy product flow on packaging and warehouse conveyors.
Replacing the Airtac SI80 Standard Air Cylinder SI80X280STC with the SAI80X280STC
To replace the SI80X280STC, order the SAI80X280STC. It is a direct per the ISO 15552 mounting interface, matching the 80 mm bore, 280 mm stroke, G3/8 port, and TC trunnion accessory. Confirm your thread standard (PT, G, or NPT) and retain the -S magnet for legacy CS1-B/DS1-B switches, noting the SAI family uses current AirTAC sensors. If sizing up or down, neighboring bores (63 mm or 100 mm) offer 1559 N or 3927 N push at 0.5 MPa respectively. Because this stroke is 280 mm, ensure adequate guide support to prevent rod bending and side loads. Remember that a standard cylinder does not hold load without live air; for secure holding consider the SAIL air-released lock, the BSAI clamp-lock, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X280STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80X280STC FAQ
Yes, the SI80X280STC is discontinued. The direct replacement is the AirTAC SAI80X280STC. It features the same ISO 15552 mounting interface, 80 mm bore, 280 mm stroke, G3/8 port, and TC trunnion mount, fitting directly into existing fixtures.
At 0.5 MPa it provides 2513 N push and 2268 N pull. Push force is 3518 N at 0.7 MPa and 4523 N at 0.9 MPa, with a theoretical max of 513 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a 25 mm rod with M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X280STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X280STC replacement — usually within 7-8 hours.