This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X30STC, 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 SI50X30STC
The AirTAC Airtac SI50 Standard Cylinder SI50X30STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X30STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X30STC
- 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 SI50X30STC
The AirTAC SI50X30STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 30mm stroke, G1/4 port and TC trunnion mount. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X30STC. This direct upgrade shares identical ISO 15552 mounting dimensions, bore, stroke and output force.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors. Note that standard cylinders drift without air; use a SAIL lock or external check valve to hold loads.
Airtac SI50 Standard Cylinder SI50X30STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X30STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X30STC |
| Bore size | Ø50 mm |
| Stroke | 30 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 SAI50X30STC 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 SAI50X30STC 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 SI50X30STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SI50X30STC Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using the 30mm stroke and 982N force at 0.5MPa to secure components firmly in fixtures.
Package Diverting
Provides rapid actuation for sorting or diverting items on a conveyor line, with speeds of 30-800mm/s and TC trunnion mounting.
Replacing the Airtac SI50 Standard Cylinder SI50X30STC with the SAI50X30STC
To replace the SI50X30STC, order the SAI50X30STC. Verify the ISO 15552 TC trunnion mount, 50mm bore, 30mm stroke, G1/4 port (PT/G/NPT thread) and the -S magnet for CS1-B/DS1-B switches. Sizing both ways: a 40mm bore yields 628N [email protected], while a 63mm bore yields 1559N. This 50mm bore provides 1374N at 0.7MPa. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SAIF variant adds a built-in 4M valve. Rod material options include carbon steel, SUS420J2 (A) or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X30STC
- ✓ 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 SI50X30STC FAQ
Yes, the AirTAC SI50X30STC is discontinued. The direct replacement is the SAI50X30STC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 30mm stroke, G1/4 port, TC mount and output force, so it fits existing fixtures directly.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, with a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s with 30mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X30STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X30STC replacement — usually within 7-8 hours.