This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX135S, 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 SI80AX135S
The AirTAC SI80 Standard Air Cylinder SI80AX135S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 135mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80AX135S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke135 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80AX135S
- 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 SI80AX135S
The AirTAC SI80AX135S is a discontinued double-acting ISO 15552 profile cylinder with a 135 mm stroke and an SUS420J2 stainless steel rod. It delivers 2513 N push and 2268 N pull at 0.5 MPa, utilizing a G3/8 port and M20x1.5 rod thread. AirTAC replaced this legacy unit with the SAI80AX135S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, output force, and cushioning.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the SI line. This -S SKU includes a piston magnet for CS1-B/DS1-B switches.
Airtac SI80 Standard Air Cylinder SI80AX135S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX135S |
| Bore size | Ø80 mm |
| Stroke | 135 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 SAI80AX135S 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 SAI80AX135S 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 SI80AX135S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×135 | 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 SI80AX135S Is Used
Clamp Actuation
Drives robust fixturing clamps requiring high force, using the 135 mm stroke to secure heavy workpieces during machining operations.
Diversion Gates
Powers heavy-duty routing flaps on packaging lines, where the 80 mm bore provides decisive thrust to push product streams at speed.
Pallet Stops
Acts as a high-strength pneumatic stop for loaded pallets, with the SUS420J2 rod enduring occasional side impacts in transit zones.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX135S with the SAI80AX135S
To replace the discontinued SI80AX135S, order the SAI80AX135S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G3/8 port, the M20x1.5 thread, and the -S magnet for legacy CS1-B/DS1-B sensors. The 80 mm bore yields 2513 N push at 0.5 MPa; if sizing up or down, adjacent ISO 15552 bores are 63 mm (1559 N) and 100 mm (3927 N). Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify an external pilot check valve or the SAIL/BSAI lock variant. The SUS420J2 rod resists corrosion versus standard carbon steel.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX135S
- ✓ 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 SI80AX135S FAQ
Yes, the SI80AX135S is discontinued. The direct replacement is the SAI80AX135S. It shares the identical ISO 15552 mounting interface, 80 mm bore, 135 mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The 80 mm bore provides 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with 36 mm adjustable air cushions at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX135S replacement — usually within 7-8 hours.