This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X150H, 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 SI50X150H
The AirTAC Airtac SI50 Standard Cylinder SI50X150H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X150H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X150H
- 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 SI50X150H
The AirTAC SI50X150H is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 150 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, features a G1/4 port, and uses a Viton H seal for 0-150 C high-temperature environments. As this SKU lacks a magnet, it cannot accept a position sensor.
AirTAC replaced the SI line with the SAI family. The SAI50X150H is the direct replacement, retaining the same ISO 15552 mounting interface, M16x1.5 rod thread, and 30 mm cushions. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI50 Standard Cylinder SI50X150H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X150H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X150H |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAI50X150H 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 SAI50X150H 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 SI50X150H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50X150H Is Used
Hot End Ejection
Clamping and ejecting parts near ovens or heat sources where the Viton H seal survives 0-150 C temperatures without degrading.
Transfer Diverters
Powering 150 mm stroke diverting gates on packaging conveyors where the G1/4 port and ISO 15552 mounts fit existing brackets.
Replacing the Airtac SI50 Standard Cylinder SI50X150H with the SAI50X150H
To replace the discontinued SI50X150H, order the SAI50X150H. Verify your ISO 15552 mounting fixtures, G1/4 air port, and M16x1.5 rod thread. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, select an SAI50X150HS instead. The 150 mm stroke is below the 1200 mm maximum, so standard side-load limits apply, but always ensure rigid guidance for heavy loads. For sizing, the 50 mm bore yields 982 N at 0.5 MPa; dropping to a 40 mm bore gives 628 N, while a 63 mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X150H
- ✓ 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 SI50X150H FAQ
Yes, the SI50X150H is discontinued. The direct replacement is the AirTAC SAI50X150H. It shares the identical ISO 15552 mounting interface, 50 mm bore, 150 mm stroke, G1/4 port, and Viton H high-temperature seal, fitting directly into your existing fixtures.
The 50 mm bore uses a G1/4 air port. The thrust ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. The piston rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X150H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X150H replacement — usually within 7-8 hours.