This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75LB, 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 SI50X75LB
The AirTAC Airtac SI50 Standard Cylinder SI50X75LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X75LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X75LB
- 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 SI50X75LB
The AirTAC SI50X75LB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X75LB, which matches the original LB foot mount, M16x1.5 rod thread and output force exactly.
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 a magnet and cannot take a switch. If high temperatures up to 150C are needed, specify the Viton H seal option.
Airtac SI50 Standard Cylinder SI50X75LB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75LB |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50X75LB 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 SAI50X75LB 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 SI50X75LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50X75LB Is Used
Assembly Line Clamping
Ideal for mid-force clamping of parts on automated assembly lines, using the 982N push force to secure components during machining or fastening.
Package Diverting
Provides reliable 75mm stroke actuation for diverting medium-weight packages or pallets on conveyor systems at speeds up to 800mm/s.
Material Stop Gates
Deploys quickly as a stop gate mechanism in material handling zones, where the LB foot mount absorbs lateral stresses during impact.
Replacing the Airtac SI50 Standard Cylinder SI50X75LB with the SAI50X75LB
To replace the SI50X75LB, order the SAI50X75LB. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the same 50mm bore, 75mm stroke, LB foot mounting, and G1/4 port. Because this non-magnet SKU cannot accept a sensor, order an SAI variant with the S suffix if position feedback is required. If you need to size up or down, the neighbouring 40mm bore yields 628N push at 0.5MPa, while the 63mm bore provides 1559N. Remember that a standard cylinder does not hold load on air loss; the adjustable 30mm cushions only decelerate near stroke end. For secure holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75LB
- ✓ 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 SI50X75LB FAQ
Yes, the AirTAC SI50X75LB is discontinued. The direct replacement is the SAI50X75LB. It shares the identical ISO 15552 mounting interface, 50mm bore, 75mm stroke, LB foot mount, and G1/4 port, fitting directly into existing fixtures.
The 50mm bore delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X75LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75LB replacement — usually within 7-8 hours.