This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100H, 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 SI50X100H
The AirTAC SI50 Standard Cylinder SI50X100H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X100H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X100H
- 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 SI50X100H
The AirTAC SI50X100H is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 100 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The factory has ended this line, so the direct replacement is the SAI50X100H. It shares the same ISO 15552 mounting interface, bore, stroke, output force, port size and accessories, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI50X100H unit features a Viton H seal for 0-150 C high-temperature environments. Without a -S magnet, it cannot accept a sensor.
Airtac SI50 Standard Cylinder SI50X100H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100H |
| Bore size | Ø50 mm |
| Stroke | 100 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 SAI50X100H 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 SAI50X100H 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 SI50X100H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×100 | 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 SI50X100H Is Used
High-Temperature Ejection
Uses the Viton H seal to eject molded parts from hot environments up to 150 C without degrading.
50 kg Transfer Diverter
Provides reliable 100 mm stroke diverting force for mid-weight packages on packaging lines.
Clamping Fixtures
Delivers 982 N push at 0.5 MPa to secure workpieces during machining or welding operations.
Replacing the Airtac SI50 Standard Cylinder SI50X100H with the SAI50X100H
To replace the discontinued SI50X100H, order the SAI50X100H. Confirm the ISO 15552 mounting interface, 50 mm bore, 100 mm stroke, G1/4 port (PT/G/NPT) and your specific mounting accessory. This unit lacks a magnet (-S), so it cannot support position sensing; if sensing is needed, specify an SAI with an S suffix and current AirTAC switches. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. If downsizing, a 40 mm bore yields 628 N push; if upsizing, a 63 mm bore provides 1559 N. The 100 mm stroke is under 300 mm, so rod-bending side loads are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100H
- ✓ 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 SI50X100H FAQ
Yes, the AirTAC SI50X100H is discontinued. The direct replacement is the SAI50X100H. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 100 mm stroke, G1/4 port and mounting interface.
It features a G1/4 air port. At 0.5 MPa it pushes 982 N and pulls 825 N. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical max force is 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100H replacement — usually within 7-8 hours.