This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X115, 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 SI50X115
The AirTAC Airtac SI50 Standard Cylinder SI50X115 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X115, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X115
- 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 SI50X115
The AirTAC SI50X115 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 115mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X115, a direct sharing the exact mounting interface, bore, stroke, force, port and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, note this specific SKU lacks the -S magnet and cannot accept CS1-B/DS1-B switches. For high heat, Viton H seals raise the limit to 150C.
Airtac SI50 Standard Cylinder SI50X115 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X115 |
| Bore size | Ø50 mm |
| Stroke | 115 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 SAI50X115 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 SAI50X115 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 SI50X115
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×115 | 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 SI50X115 Is Used
Package Diverting
Actuates routing gates on packaging lines where 982N push force easily deflects standard cartons.
Clamp Actuation
Drives mid-force clamping jaws on machining fixtures, utilizing the 115mm stroke to clear workpieces.
Replacing the Airtac SI50 Standard Cylinder SI50X115 with the SAI50X115
To replace the SI50X115, order the SAI50X115. Confirm the ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion) and the G1/4 port match your fixture. Because this SKU has no -S magnet, it cannot support position sensing; if you need switches, specify a magnet on the SAI order. Sizing both ways: if 982N at 0.5MPa is insufficient, step up to the 63mm bore (1559N); if overpowered, drop to 40mm (628N). A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use the SAIL lock or BSAI clamp-lock variant, or an external pilot check valve. With a 115mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X115
- ✓ 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 SI50X115 FAQ
Yes, the SI50X115 is discontinued. The direct replacement is the SAI50X115. It shares the identical ISO 15552 mounting interface, 50mm bore, 115mm stroke, output force, G1/4 port and accessories, fitting existing fixtures perfectly.
The bore is 50mm with a G1/4 air port. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. The piston rod is 20mm with an M16x1.5 thread.
Request a Quote for the SAI50X115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X115 replacement — usually within 7-8 hours.