This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X980STC, 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 SI50 Standard Cylinder SI50X980STC
The AirTAC Airtac SI50 Standard Cylinder SI50X980STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 980mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X980STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke980 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X980STC
- 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 SI50 Standard Cylinder SI50X980STC
The AirTAC SI50X980STC is a discontinued double-acting ISO 15552 profile cylinder. It delivers 982 N push at 0.5 MPa through a 50 mm bore, 980 mm stroke, and G1/4 port. The direct replacement is the SAI50X980STC, retaining the exact TC trunnion mount, M16x1.5 rod, and 30 mm cushions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X980STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X980STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X980STC |
| Bore size | Ø50 mm |
| Stroke | 980 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X980STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X980STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X980STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×980 | 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 SI50 Standard Cylinder SI50X980STC Is Used
Long-Stroke Diversion
Pushes packages across a 980 mm conveyor lane using the 982 N force class, relying on the TC mount to pivot smoothly under shifting loads.
Vertical Material Lift
Raises components up to 50 kg in a storage rack, requiring external guides along the 980 mm travel to prevent rod bending and ensure smooth vertical movement.
Automated Assembly Transfer
Moves workpieces between distant stations, utilizing the adjustable 30 mm cushions to decelerate the payload safely at both ends of the lengthy stroke.
Replacing the Airtac SI50 Standard Cylinder SI50X980STC with the SAI50X980STC
To replace the SI50X980STC, order the SAI50X980STC. Confirm the ISO 15552 TC trunnion interface, 50 mm bore, 980 mm stroke, G1/4 port, and -S magnet for CS1-B/DS1-B switches. For sizing, neighboring bores are 40 mm (628 N @0.5 MPa) and 63 mm (1559 N). A plain cylinder drifts on air loss; the cushions only decelerate. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 980 mm, add external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X980STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X980STC FAQ
Yes, the SI50X980STC is discontinued. The direct replacement is the SAI50X980STC. It is dimensionally interchangeable per ISO 15552, keeping the same 50 mm bore, 980 mm stroke, G1/4 port, TC mount, and output force.
The 50 mm bore with a G1/4 port provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X980STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X980STC replacement — usually within 7-8 hours.