This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X958S, 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 SI80X958S
The AirTAC SI80 Standard Air Cylinder SI80X958S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 958mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X958S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke958 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X958S
- 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 SI80X958S
The AirTAC SI80X958S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, adjustable air cushions, and a built-in piston magnet for CS1-B/DS1-B switches. Delivering 2513 N of push force at 0.5 MPa, it has been superseded by the SAI80X958S. This direct replacement shares the exact 80 mm bore, 958 mm stroke, G3/8 port, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while keeping the 513 kgf maximum force. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked, and seal options like Viton H extend temperature limits to 150 C.
Airtac SI80 Standard Air Cylinder SI80X958S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X958S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X958S |
| Bore size | Ø80 mm |
| Stroke | 958 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 SAI80X958S 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 SAI80X958S 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 SI80X958S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×958 | 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 SI80X958S Is Used
Long-Stroke Material Transfer
Drives large packages across wide conveyor gaps using the 958 mm stroke and 2513 N push force, guided externally to prevent rod bending.
Automated Press Ejection
Ejects formed parts from large presses, relying on adjustable 36 mm air cushions to decelerate the 80 mm bore at high speeds.
Replacing the Airtac SI80 Standard Air Cylinder SI80X958S with the SAI80X958S
To replace the SI80X958S, order the SAI80X958S and verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G3/8 port thread, and the -S magnet for current AirTAC switches. Sizing both ways: the neighboring 63 mm bore yields 1559 N push at 0.5 MPa, while the 100 mm bore provides 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. With a 958 mm stroke, prevent rod bending by using an external guide to absorb side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X958S
- ✓ 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 SI80X958S FAQ
Yes, the SI80X958S is discontinued. The direct replacement is the SAI80X958S. It shares the identical ISO 15552 mounting interface, 80 mm bore, 958 mm stroke, G3/8 port, and output force, dropping directly into existing fixtures.
This double-acting cylinder features a 25 mm rod, M20x1.5 thread, and operates at 30-800 mm/s. Force ratings are: 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a theoretical max of 513 kgf at 1.0 MPa. The G3/8 port is fixed by the bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X958S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X958S replacement — usually within 7-8 hours.