This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50SLB, 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 SI50X50SLB
The AirTAC Airtac SI50 Standard Cylinder SI50X50SLB 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 SAI50X50SLB, 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 → SAI50X50SLB
- 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 SI50X50SLB
The AirTAC SI50X50SLB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 50mm stroke, LB foot mount, and a magnetic piston for CS1-B/DS1-B switches. Delivering 982 N of push force at 0.5 MPa, it features a G1/4 port and M16x1.5 rod thread. AirTAC replaced this unit with the SAI50X50SLB, a direct upgrade sharing the exact ISO 15552 mounting interface, force, and dimensions.
The SAI replacement introduces an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. It also expands configuration options with SAIL, SAIF, and BSAI variants.
Airtac SI50 Standard Cylinder SI50X50SLB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50SLB |
| 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 SAI50X50SLB 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 SAI50X50SLB 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 SI50X50SLB
| 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 SI50X50SLB Is Used
Clamping Fixtures
Secures mid-weight machined parts during milling or drilling with 982 N of clamping force at 0.5 MPa.
Package Diverters
Short 50mm stroke actuates routing gates to push parcels between adjacent conveyor lines.
Pallet Stops
Deploys a pneumatic stop block to halt pallets at a specific workstation along a roller track.
Replacing the Airtac SI50 Standard Cylinder SI50X50SLB with the SAI50X50SLB
To replace the SI50X50SLB, order the SAI50X50SLB. Verify your ISO 15552 LB foot mount interface, 50mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. If you need more force, the neighbouring 63mm bore yields 1559 N at 0.5 MPa; if less is required, the 40mm bore provides 628 N. Note that a standard cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. Rod material options include carbon steel, SUS420J2, or SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50SLB
- ✓ 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 SI50X50SLB FAQ
Yes, the AirTAC SI50X50SLB is discontinued. The direct replacement is the SAI50X50SLB. It shares the identical ISO 15552 mounting interface, 50mm bore, 50mm stroke, G1/4 port, and output force, fitting directly into your existing LB foot mount fixtures.
This 50mm bore cylinder features a G1/4 air port and an M16x1.5 rod thread. The output force is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X50SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50SLB replacement — usually within 7-8 hours.