This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X80, 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X80
- 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80
The AirTAC B04-SID50X80 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the base SID50X80. A rod exits both ends of the extruded aluminum barrel on a single piston, meaning both faces use the rod-side area to deliver equal push and pull force of 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. It features a 20 mm rod, M16x1.5 thread, 30 mm adjustable cushions, a G1/4 port, and operates at 30-800 mm/s. This legacy model is discontinued and is fully replaced by the direct replacement SAID50X80.
The SAID50X80 successor retains the exact ISO 15552 mounting interface, bore, stroke, and porting, while upgrading the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Because the rod exits both ends, the rear extension can carry a sensor cam or drive a second tool simultaneously, though this specific non-magnetic SKU cannot accept a switch. Note that air cushions only decelerate near stroke end; a plain cylinder drifts on air loss, so use an external rod lock or the SAIL/BSAI lock variants for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X80 |
| Bore size | Ø50 mm |
| Stroke | 80 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 B04-SAID50X80 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 B04-SAID50X80 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 Is Used
Excavator Linkage Control
Uses the equal both-ways force and anti-rotation properties of the double rod to synchronously actuate secondary hydraulic valves or covers on heavy construction equipment.
Crusher Feed Gate
Employs the dual-rod architecture to push and pull a heavy aggregate feed gate with identical 825 N force at 0.5 MPa, ensuring consistent material flow on site.
Loader Attachment Brake
Leverages the rear rod extension to mechanically disengage a secondary locking pin on construction machinery, operating two mechanisms from one cylinder body.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 with the B04-SAID50X80
To replace the discontinued B04-SID50X80, specify the direct replacement SAID50X80, which matches the 50 mm bore, 80 mm stroke, G1/4 port, and ISO 15552 mounting footprint without mechanical changes. When sizing, remember the double-rod design provides equal force both ways (825 N @0.5 MPa), so if you need more thrust, step up to the 63 mm bore (1402 N @0.5 MPa) or drop to the 40 mm bore (528 N @0.5 MPa) based on your load. A double-rod cylinder is the right choice when you need anti-rotation stability, want to drive two tools from one piston, or need a back rod to carry a sensor cam. Mounting options include Basic, FA, LB, and TC brackets. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For strokes of 300 mm or longer, carefully manage side-load alignment to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X80
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80 FAQ
Yes, the B04-SID50X80 is discontinued. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID50X80. The direct replacement is the SAID50X80, which shares the identical ISO 15552 interface, 50 mm bore, 80 mm stroke, G1/4 port, and equal both-ways force, but features an upgraded piston seal.
Because it is a double-rod cylinder, the push and pull force are equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The air port is G1/4.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X80
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