This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID80X250, 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-SID80X250
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID80X250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAID80X250
- 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-SID80X250
The AirTAC B04-SID80X250 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 2268 N @0.5 MPa. The B04- prefix marks this as a construction-machinery dedicated variant of the base SID80X250, mechanically identical with a 25mm rod, M20x1.5 thread, and G3/8 port. This SKU has no -S magnet and cannot carry a sensor. The SID line is discontinued; the direct replacement is the SAID80X250, sharing the same interface, bore, stroke, and mounting.
Because both faces use the rod-side area, force is equal both ways (3175 N @0.7 MPa, 4082 N @0.9 MPa). The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The cylinder does not hold loads on air loss; the 36mm adjustable cushion only decelerates near stroke end. For held loads, use an external rod lock or SAIL/BSAI variant.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID80X250 |
| Bore size | Ø80 mm |
| Stroke | 250 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-SAID80X250 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-SAID80X250 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-SID80X250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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-SID80X250 Is Used
Excavator Linkage Control
Drives dual-action mechanisms on heavy equipment where equal push and pull force is required to pivot or lock structural components safely.
Loader Attachment Shift
Provides stable, anti-rotation linear motion for shifting auxiliary attachments on construction loaders, handling dynamic impact loads.
Crane Slewing Brake
Actuates braking or positioning pins on mobile cranes, using the double-rod design to synchronize two mechanical linkages simultaneously.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250 with the B04-SAID80X250
To replace B04-SID80X250, use the direct replacement SAID80X250. It preserves the ISO 15552 mounting interface, G3/8 port, and 25mm rod, allowing direct reuse of FA, LB, or TC mounts. Size both ways by checking neighbour bores: the 63mm bore yields 1402 N @0.5 MPa, while the 100mm bore yields 3681 N @0.5 MPa, ensuring you match the required equal-both-ways force. Choose a double-rod cylinder when anti-rotation stability is needed or when the back rod must drive a second tool. This non-magnetic SKU cannot take a switch. For this 250mm stroke, side-load is minimal, but for strokes >=300mm, verify guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID80X250
- ✓ 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-SID80X250 FAQ
Yes, the SID series is discontinued. The direct replacement is the SAID80X250. The B04- prefix simply marks this as a construction-machinery dedicated variant of the SID80X250, so the SAID80X250 matches its ISO 15552 interface, 80mm bore, 250mm stroke, and G3/8 port perfectly.
Force is equal both ways because it is a double-rod cylinder: 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. The air port is G3/8. It operates at 0.15-1.0 MPa with a 36mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
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