This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX115, 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 SI50AX115
The AirTAC Airtac SI50 Standard Cylinder SI50AX115 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 SAI50AX115, 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 → SAI50AX115
- 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 SI50AX115
The AirTAC SI50AX115 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 115mm stroke, delivering 982 N push and 825 N pull at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI50AX115. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and port size, dropping directly into existing fixtures without mechanical changes.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for longer life and lower start-up pressure. Because this specific SKU lacks the -S magnet suffix, it cannot accept position switches like the legacy CS1-B/DS1-B sensors. The SAI family also adds SAIL and BSAI lock variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50AX115 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX115 |
| 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 SAI50AX115 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 SAI50AX115 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 SI50AX115
| 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 SI50AX115 Is Used
Package Diverting
Actuates diverting arms on packaging lines using the 982 N push force to redirect cartons reliably at speeds up to 800 mm/s.
Clamp Fixtures
Secures medium-weight workpieces in machining fixtures where the 825 N pull force and ISO 15552 mounting ensure rigid holding.
Replacing the Airtac SI50 Standard Cylinder SI50AX115 with the SAI50AX115
To replace the SI50AX115, order the SAI50AX115. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the M16x1.5 rod-end thread. This SKU has no -S magnet, so it cannot support CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the S suffix. For sizing, the 50mm bore yields 982 N push at 0.5 MPa; a neighbouring 63mm bore offers 1559 N, while a 40mm bore provides 628 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. At 115mm stroke, rod buckling is minimal, but ensure adequate guidance to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX115
- ✓ 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 SI50AX115 FAQ
Yes, the SI50AX115 is discontinued. The direct replacement is the SAI50AX115. It shares the identical ISO 15552 mounting interface, 50mm bore, 115mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It delivers 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 maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX115 replacement — usually within 7-8 hours.