This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50H, 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 SI50X50H
The AirTAC Airtac SI50 Standard Cylinder SI50X50H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X50H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X50H
- 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 SI50X50H
The AirTAC SI50X50H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke. Built for high-temperature duty with a Viton H seal (0 to 150 C), it delivers a 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X50H, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and longevity. Note this non-magnet SKU cannot host a sensor, and for load holding you must add an external rod lock or check valve, as cushions only decelerate.
Airtac SI50 Standard Cylinder SI50X50H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50H |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50X50H 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 SAI50X50H 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 SI50X50H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50X50H Is Used
Hot End Ejection
Utilizes the Viton H seal for 0-150 C environments, providing 982 N of push force to eject warm molded components safely.
Compact Clamping
Fits ISO 15552 fixtures in tight 50mm stroke spaces, delivering reliable clamping pressure for light metal machining.
Diversion Gate
Actuates routing gates on production lines where the 50 kg vertical lift capacity easily manages flap mechanisms.
Replacing the Airtac SI50 Standard Cylinder SI50X50H with the SAI50X50H
To replace the discontinued SI50X50H, order the SAI50X50H. It drops directly into existing ISO 15552 fixtures with the same 50mm bore, 50mm stroke, M16x1.5 rod thread, and G1/4 port. Retain your high-temperature Viton H specification and mounting accessories. Because this SKU lacks a magnet (-S), it cannot accept CS1-B or DS1-B sensors; if position feedback is required, switch to a magnet-equipped SAI50X50S. Remember that a standard cylinder drifts on air loss—use the SAIL or BSAI lock variants if you need secure load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50H
- ✓ 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 SI50X50H FAQ
Yes, the SI50X50H is discontinued. The direct replacement is the SAI50X50H. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 50mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder uses a G1/4 air port. It generates a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa the push force is 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X50H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50H replacement — usually within 7-8 hours.