This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID80X250S, 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-SID80X250S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250S 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-SAID80X250S, 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-SAID80X250S
- 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-SID80X250S
The AirTAC B04-SID80X250S 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 AirTAC's construction-machinery dedicated variant, mechanically identical to the base SID80X250S with a 80mm bore, 250mm stroke, G3/8 port, and M20x1.5 rod thread. This SID model is discontinued; the direct replacement is the SAID80X250S, which shares the same interface, force, and mounting.
The SAID upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Double-rod benefits include anti-rotation and driving two tools from one piston. Note that air cushions only decelerate; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID80X250S |
| 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-SAID80X250S 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-SAID80X250S 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-SID80X250S
| 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-SID80X250S Is Used
Excavator Linkage Control
Equal push/pull force actuates auxiliary linkage on heavy equipment, utilizing the double-rod's anti-rotation properties for stable positioning in harsh construction environments.
Loader Material Diversion
Drives a dual-sided diverter gate on a conveyor feeding crusher hoppers, where the back rod simultaneously operates a mechanical valve cam for synchronized timing.
Crane Fork Positioning
Adjusts fork width on heavy-duty lifting frames, using the equal both-ways force to securely clamp and release loads without the drift common to single-rod pull strokes.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X250S with the B04-SAID80X250S
To replace the discontinued B04-SID80X250S, use the SAID80X250S directly—it matches the 80mm bore, 250mm stroke, 2268 N equal-both-ways force, G3/8 port, and ISO 15552 mounting. When sizing both ways, verify force against neighboring bores (63mm or 100mm) if changing payloads, but the 80mm provides 2268 N @0.5 MPa. A double rod is right when you need anti-rotation, a back rod for a sensor cam, or to drive two tools. Mounting options include FA, LB, and TC. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. For this 250mm stroke, side-load is minimal, but for strokes >=300mm, ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID80X250S
- ✓ 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-SID80X250S FAQ
Yes, the B04-SID80X250S is discontinued. The direct replacement is the SAID80X250S. The B04- prefix simply marks it as construction-machinery dedicated; mechanically it is identical to the base SID80X250S. The SAID replacement shares the same ISO 15552 interface, 80mm bore, 250mm stroke, G3/8 port, and mounting.
Force is equal both ways due to the double-rod design: 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. Speed is 30-800 mm/s. It features a 25mm rod, M20x1.5 thread, and 36mm adjustable cushions. It does not hold loads on air loss; use an external rod lock for held loads.
Related AirTAC SAI Cylinders
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