This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75SCB, 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 SI50X75SCB
The AirTAC Airtac SI50 Standard Cylinder SI50X75SCB 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 SAI50X75SCB, 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 → SAI50X75SCB
- 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 SI50X75SCB
The AirTAC SI50X75SCB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. AirTAC replaced this with the SAI50X75SCB, a direct sharing the same CB clevis mounting, M16x1.5 rod thread, and 30mm cushions.
The SAI upgrade features two Y-shaped one-way piston seals for lower start-up pressure. The SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants. Your -S magnet works with CS1-B/DS1-B switches, while a plain cylinder drifts on air loss as cushions only decelerate.
Airtac SI50 Standard Cylinder SI50X75SCB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75SCB |
| 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 SAI50X75SCB 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 SAI50X75SCB 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 SI50X75SCB
| 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 SI50X75SCB Is Used
Package Diverting
Ideal for actuating routing gates on packaging lines, using the 75mm stroke to push parcels smoothly without overstressing the rod.
Pallet Stop Arms
Provides reliable stopping force for medium-weight pallets on roller conveyors, utilizing the 982N push force at 0.5MPa.
Clamp Actuation
Suitable for operating medium-duty clamping arms in machining fixtures where a 50kg vertical lift capacity is sufficient.
Replacing the Airtac SI50 Standard Cylinder SI50X75SCB with the SAI50X75SCB
To replace the SI50X75SCB, order the SAI50X75SCB. It drops into existing fixtures via the ISO 15552 interface, matching the 50mm bore, 75mm stroke, G1/4 port, and CB clevis mount. Confirm your thread option (PT/G/NPT) and retain the -S magnet for CS1-B/DS1-B sensors. For higher force, the 63mm bore yields 1559N push at 0.5MPa; for less, the 40mm bore yields 628N. Note that standard cylinders drift without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75SCB
- ✓ 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 SI50X75SCB FAQ
Yes, the SI50X75SCB is discontinued. The direct replacement is the SAI50X75SCB. It is dimensionally interchangeable per ISO 15552, retaining the exact same 50mm bore, 75mm stroke, G1/4 port, and CB mounting interface.
The 50mm bore uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X75SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75SCB replacement — usually within 7-8 hours.