This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1500, 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 SI50X1500
The AirTAC Airtac SI50 Standard Cylinder SI50X1500 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1500, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1500
- 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 SI50X1500
The AirTAC SI50X1500 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1500mm stroke. Because 1500mm exceeds the 1200mm standard maximum for this bore, it is a non-standard, made-to-order length. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. This legacy unit is replaced by the SAI50X1500.
The SAI50X1500 is a direct replacement, matching the exact ISO 15552 mounting interface, output force, and M16x1.5 rod thread. The upgraded SAI piston seal uses two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU lacks a magnet and cannot accept a CS1-B/DS1-B sensor. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI50 Standard Cylinder SI50X1500 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1500 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1500 |
| Bore size | Ø50 mm |
| Stroke | 1500 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 SAI50X1500 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 SAI50X1500 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 SI50X1500
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1500 | 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 SI50X1500 Is Used
Long-Stroke Material Transfer
Pushes products between distant workstations on a wide conveyor belt using its 1500mm reach and 982N force at 0.5MPa.
High-Bay Ejection Arm
Actuates a long ejection mechanism to clear palletized goods from storage racks, requiring an external guide to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X1500 with the SAI50X1500
To replace the SI50X1500, order the SAI50X1500. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU has no -S magnet, it cannot support position sensing; if you need switches, select an SAI50X1500S and use current AirTAC sensors. Sizing both ways: a 63mm bore offers 1559N at 0.5MPa for heavier loads, while a 40mm bore provides 628N if you want a smaller footprint. Note that 1500mm exceeds the 1200mm standard stroke for the 50mm bore, making it a non-standard order. At this extended length, prevent rod bending and side-load damage by using an external guide. A plain cylinder drifts without live air; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1500
- ✓ 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 SI50X1500 FAQ
Yes, the SI50X1500 is discontinued. The direct replacement is the SAI50X1500. It matches the ISO 15552 mounting interface, 50mm bore, 1500mm stroke, output force, G1/4 port, and mounting accessories, fitting directly into existing fixtures.
This double-acting cylinder has a G1/4 air port and M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1500
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1500 replacement — usually within 7-8 hours.