This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75TC, 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 SI50X75TC
The AirTAC Airtac SI50 Standard Cylinder SI50X75TC 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 SAI50X75TC, 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 → SAI50X75TC
- 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 SI50X75TC
The AirTAC SI50X75TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X75TC, matching the TC trunnion mount, M16x1.5 rod thread and 30mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X75TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75TC |
| 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 SAI50X75TC 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 SAI50X75TC 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 SI50X75TC
| 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 SI50X75TC Is Used
Package Diversion
Drives 50 kg pusher arms on packaging lines to redirect cartons at 75mm stroke without overwhelming the fixture.
Clamp Actuation
Provides 825 N pull force at 0.5 MPa to secure mid-weight workpieces during machining operations.
Gate Control
Operates short-throw sorting gates in distribution hubs, fitting standard ISO 15552 TC trunnion mounts.
Replacing the Airtac SI50 Standard Cylinder SI50X75TC with the SAI50X75TC
To replace the SI50X75TC, order the SAI50X75TC. Verify the ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread options) and TC trunnion accessory. This non-magnetic SKU cannot take a sensor; if sensing is needed, select an SAI50X75S equivalent. Sizing both ways: the 50mm bore gives 982 N push at 0.5 MPa, while the neighbouring 40mm bore yields 628 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/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75TC
- ✓ 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 SI50X75TC FAQ
Yes, the AirTAC SI50X75TC is discontinued. The direct replacement is the SAI50X75TC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 75mm stroke, TC mount, G1/4 port and output force.
The 50mm bore features a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X75TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75TC replacement — usually within 7-8 hours.