This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX50LB, 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 SI50AX50LB
The AirTAC SI50 Standard Cylinder SI50AX50LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX50LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX50LB
- 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 SI50AX50LB
The AirTAC SI50AX50LB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX50LB, which shares identical mounting, force, and interface dimensions.
This SKU lacks a magnet (-S) and cannot accept a sensor. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure, and adds SAIL/BSAI lock variants the SI lacked. The -A rod is SUS420J2 stainless steel.
Airtac SI50 Standard Cylinder SI50AX50LB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX50LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX50LB |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50AX50LB 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 SAI50AX50LB 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 SI50AX50LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50AX50LB Is Used
Stainless Rod Clamping
Ideal for moderate-duty clamping stations where the SUS420J2 stainless rod resists moisture and the 982 N force secures parts firmly.
Short-Stroke Diverting
The 50mm stroke provides rapid actuation for diverting packages on a line, operating efficiently at 30-800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50AX50LB with the SAI50AX50LB
To replace this SI50AX50LB, order the SAI50AX50LB. Verify the ISO 15552 LB foot mounting, 50mm bore, 50mm stroke, G1/4 port, and SUS420J2 stainless rod. Since this SKU has no magnet, it cannot support legacy CS1-B/DS1-B sensors; add the -S suffix if sensing is needed. For sizing, the 40mm bore yields 628 N push @0.5 MPa, while the 63mm bore yields 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX50LB
- ✓ 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 SI50AX50LB FAQ
Yes, the SI50AX50LB is discontinued. The direct replacement is the SAI50AX50LB. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 50mm stroke, LB mount, and G1/4 port.
This double-acting cylinder has a G1/4 port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX50LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX50LB replacement — usually within 7-8 hours.