This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID80X50S, 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-SID80X50S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID80X50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAID80X50S
- 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-SID80X50S
The B04-SID80X50S is an AirTAC ISO 15552 double-acting double-rod cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID80X50S. Mechanically identical to the standard line, it features a 80mm bore, 50mm stroke, G3/8 port, and M20x1.5 rod thread. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal (2268N at 0.5MPa). This model is discontinued and the direct replacement is the SAID80X50S.
The SAID80X50S retains the exact ISO 15552 interface, bore, stroke, and mounting options (Basic, FA, LB, TC, FTC, TCM1, TCM2). The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X50S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID80X50S |
| Bore size | Ø80 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID80X50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The B04-SAID80X50S 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-SID80X50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×50 | 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-SID80X50S Is Used
Excavator Linkage Actuation
Drives dual-tool mechanisms on heavy equipment where the B04- construction-machinery prefix ensures fitment, using the back rod for a sensor cam to track linkage position.
Paver Synchronized Gating
Moves opposing gates simultaneously from a single piston, using the double-rod geometry to guarantee symmetric material flow without needing external linkages.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X50S with the B04-SAID80X50S
To replace the discontinued B04-SID80X50S, select the SAID80X50S, which offers a direct solution with identical ISO 15552 mounting dimensions, G3/8 port, and equal both ways force (2268N at 0.5MPa, 3175N at 0.7MPa, 4082N at 0.9MPa). If sizing for a new build, verify force both ways against your load, checking neighbour bores (63mm or 100mm) if margin is needed. A double-rod design is right when you need anti-rotation stability, equal push/pull power, or need to drive two tools simultaneously. Reuse FA, LB, or TC mounts directly. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 50mm stroke side-load is minimal, but for any stroke >=300mm ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID80X50S
- ✓ 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-SID80X50S FAQ
Yes, the B04-SID80X50S is discontinued. The direct replacement is the SAID80X50S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID80X50S, so mechanically the SAID80X50S matches it perfectly in ISO 15552 interface, bore, stroke, G3/8 port, and mounting.
Because it is a double-rod cylinder, force is equal both ways: 2268N at 0.5MPa, 3175N at 0.7MPa, and 4082N at 0.9MPa. The bore is 80mm, the air port is G3/8, and the rod thread is M20x1.5. Speed is 30-800mm/s. A plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end.
Related AirTAC SAI Cylinders
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