This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID80X900S, 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-SID80X900S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 900mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID80X900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke900 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAID80X900S
- 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-SID80X900S
The AirTAC B04-SID80X900S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix denotes the construction-machinery dedicated variant, mechanically identical to the base SID80X900S. A rod exits both ends of the extruded aluminum barrel, meaning push and pull force are equal both ways at 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. It features a Ø25 mm piston rod, M20x1.5 rod-end thread, G3/8 air port, and 36 mm adjustable air cushions at each end. This legacy model is discontinued and is fully replaced by the SAID80X900S.
The direct replacement SAID80X900S retains the exact ISO 15552 mounting interface, bore, stroke, and G3/8 port, but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The double-rod design provides anti-rotation stability and allows the back rod to carry a sensor cam, while the -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; they do not hold loads on air loss, so an external rod lock or pilot-operated check valve is required for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X900S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID80X900S |
| Bore size | Ø80 mm |
| Stroke | 900 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-SAID80X900S 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-SAID80X900S 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-SID80X900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×900 | 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-SID80X900S Is Used
Excavator Boom Control
Uses the equal both-ways force and anti-rotation properties of the double rod to actuate heavy-equipment control surfaces on construction machinery, matching the B04- designation.
Synchronized Tool Drive
Drives two tools simultaneously from one piston, utilizing the front and rear rods to deliver 2268 N @0.5 MPa of equal push and pull force in compact machinery.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X900S with the B04-SAID80X900S
To replace the discontinued B04-SID80X900S, select the SAID80X900S, which offers a direct swap with identical ISO 15552 mounting (Basic, FA, LB, TC, FTC, TCM1, TCM2), 80 mm bore, 900 mm stroke, and G3/8 port. When sizing both ways, verify the equal both-ways force of 2268 N @0.5 MPa is sufficient, or step up to a 100 mm bore if more force is needed. A double-rod cylinder is the right choice when you need anti-rotation resistance or require a back rod to drive a second tool or carry a sensor cam. Because this unit has a 900 mm stroke, external guides are recommended to prevent rod bending and manage side loads. The -S magnet supports legacy CS1-B/DS1-B switches, while the SAI replacement uses current AirTAC switches. For load-holding without live air, specify an external rod lock or a SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID80X900S
- ✓ 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-SID80X900S FAQ
Yes, the B04-SID80X900S is discontinued. The direct replacement is the SAID80X900S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID80X900S. The SAID replacement shares the exact ISO 15552 mounting interface, 80 mm bore, 900 mm stroke, G3/8 port, and equal both-ways force, but adds an upgraded piston seal.
Because it is a double-rod cylinder, the push and pull force are equal both ways: 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. The bore is 80 mm with a G3/8 air port, a Ø25 mm rod, and an M20x1.5 rod thread. It operates at 0.15-1.0 MPa with a speed range of 30-800 mm/s.
Related AirTAC SAI Cylinders
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