This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X40H, 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 SI50X40H
The AirTAC Airtac SI50 Standard Cylinder SI50X40H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X40H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X40H
- 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 SI50X40H
The AirTAC SI50X40H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 40mm stroke. Featuring a Viton H seal for high-temperature duties (0 to 150 C), it delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X40H, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and porting.
This SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and extended lifespan. As this specific SI SKU lacks a magnet (-S), it cannot accept position switches like the legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X40H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X40H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X40H |
| Bore size | Ø50 mm |
| Stroke | 40 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 SAI50X40H 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 SAI50X40H 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 SI50X40H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SI50X40H Is Used
Hot-End Clamping
Secures workpieces near thermal processing equipment where ambient heat demands Viton H seals rated for 150 C.
Short-Stroke Ejection
Provides a fast 40mm ejection stroke on assembly lines, utilizing the 30-800 mm/s speed range for rapid cycling.
Vertical Pressing
Applies up to 589 N of safe working force for light-duty pressing or vertical lift tasks up to 50 kg.
Replacing the Airtac SI50 Standard Cylinder SI50X40H with the SAI50X40H
To replace the discontinued SI50X40H, order the SAI50X40H, confirming the ISO 15552 mounting interface, 50mm bore, 40mm stroke, G1/4 port, and your high-temperature Viton H seal requirement. Because this SKU has no magnet, it cannot support sensing; if position detection is needed, specify an SAI50X40HS. If downsizing, a 40mm bore yields 628 N push at 0.5 MPa; if upsizing, a 63mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X40H
- ✓ 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 SI50X40H FAQ
Yes, the AirTAC SI50X40H is discontinued. The direct replacement is the SAI50X40H. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 40mm stroke, 982 N force, G1/4 port, and mounting fixtures.
This double-acting 50mm bore cylinder uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X40H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X40H replacement — usually within 7-8 hours.