This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X500, 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-SID50X500
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X500, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X500
- 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-SID50X500
The AirTAC B04-SID50X500 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal force in both directions (825 N at 0.5 MPa). The B04- prefix marks this as the construction-machinery dedicated variant of the base SID50X500, mechanically identical in bore, port, and stroke. This SID model is discontinued; the direct replacement is the SAID50X500, which reuses the same ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this SKU lacks a -S magnet, it cannot take a magnetic switch. The double-rod design provides anti-rotation stability and allows the back rod to drive a second tool.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X500 |
| Bore size | Ø50 mm |
| Stroke | 500 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-SAID50X500 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-SAID50X500 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-SID50X500
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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-SID50X500 Is Used
Excavator Linkage
Equal both-ways force drives dual-tool actuators on heavy-equipment arms without stroke imbalance.
Material Transfer
The back rod pushes a secondary mechanism on construction site conveyors, doubling output efficiency.
Loader Alignment
Anti-rotation stability from the double-rod design keeps heavy machinery forks aligned under off-center loads.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500 with the B04-SAID50X500
To replace the discontinued B04-SID50X500, use the SAID50X500 direct, keeping the identical 50mm bore, 500mm stroke, and G1/4 port. Size both ways by checking equal push/pull force against neighbor bores (32mm or 63mm) to ensure the 825 N @0.5 MPa fits your construction-machinery layout. A double rod is right when you need anti-rotation stability or a back rod to drive a second mechanism. Reuse FA, LB, or TC mounts. As this SKU lacks the -S magnet, no sensor can be fitted. For the 500mm stroke, use external guides to prevent rod bending under side loads. A plain cylinder drifts on air loss; for held loads use SAIL or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X500
- ✓ 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-SID50X500 FAQ
Yes, the B04-SID50X500 is discontinued. The direct replacement is the SAID50X500, offering the same ISO 15552 interface, 500mm stroke, and G1/4 port. The B04- prefix simply marks it as the construction-machinery dedicated variant, mechanically identical to the base SID50X500.
Force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Speed is 30-800 mm/s. The bore is 50mm with a G1/4 port.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X500
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X500 replacement — usually within 7-8 hours.