This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1000H, 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 SI50X1000H
The AirTAC SI50 Standard Cylinder SI50X1000H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1000H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1000H
- 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 SI50X1000H
The AirTAC SI50X1000H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1000mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X1000H, matching the exact interface, stroke, force, and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -H variant uses a Viton seal for 0-150C high-temperature environments.
Because this SKU lacks a magnet (-S), it cannot accept position sensors. Note that standard cylinders do not hold load without live air; the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X1000H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1000H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1000H |
| Bore size | Ø50 mm |
| Stroke | 1000 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 SAI50X1000H 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 SAI50X1000H 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 SI50X1000H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1000 | 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 SI50X1000H Is Used
High-Temp Ejection
Uses the 982N push force and Viton -H seal to eject hot molded parts (up to 150C) from a press line over a 1000mm reach.
Long-Reach Transfer
Moves components between stations on a 1-meter stroke, requiring external guide rails to support the rod and prevent binding.
Actuated Diverter
Switches heavy flow gates in thermal processing zones, relying on the G1/4 port and ISO 15552 mounts for stable integration.
Replacing the Airtac SI50 Standard Cylinder SI50X1000H with the SAI50X1000H
To replace the discontinued SI50X1000H, order the SAI50X1000H direct. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 50mm bore, 1000mm stroke, and G1/4 port. This high-temp -H Viton seal variant supports 0-150C. Because there is no -S magnet, you cannot mount legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI50X1000HS. A 1000mm stroke demands external guides to prevent rod bending and side-load damage. For sizing, the 50mm bore yields 982N push at 0.5MPa; if less force is needed, step down to a 40mm bore (628N), or up to 63mm (1559N). Remember, a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1000H
- ✓ 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 SI50X1000H FAQ
Yes, the SI50X1000H is discontinued. The direct replacement is the SAI50X1000H. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1000mm stroke, 982N force, G1/4 port, and mounting accessories.
The G1/4 port feeds a 50mm bore that yields 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. Operating pressure is 0.15-1.0MPa, with a 30mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1000H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1000H replacement — usually within 7-8 hours.