This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X80S, 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-SID40X80S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X80S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X80S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X80S
- 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-SID40X80S
The AirTAC B04-SID40X80S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the base SID40X80S, mechanically identical to the standard model. A rod exits both ends of the extruded aluminum barrel, meaning push and pull force are equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It features a 16 mm rod, M12x1.25 rod thread, and a G1/4 air port. This SID model is discontinued and the direct replacement is the SAID40X80S, which reuses the same ISO 15552 mounting interface, bore, stroke, and porting.
The SAID upgrade introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. Because the second rod can drive two tools or carry a sensor cam while resisting rotation, double-rod designs excel in heavy-equipment actuation. Note that air cushions only decelerate near stroke end; a plain cylinder does 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-SID40X80S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X80S |
| Bore size | Ø40 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID40X80S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The B04-SAID40X80S 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-SID40X80S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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-SID40X80S Is Used
Excavator Linkage Actuation
Uses the equal both-ways force and anti-rotation properties of the double rod to smoothly shift auxiliary linkage gates on construction machinery without twist.
Crusher Feed Diverter
Drives two opposing diverter flaps simultaneously from a single piston, leveraging the dual exposed rods to streamline heavy-equipment material routing.
Track Tensioning Mechanism
Applies balanced push and pull forces to adjust undercarriage components, relying on the rigid double-rod structure to maintain alignment in harsh jobsite environments.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X80S with the B04-SAID40X80S
To replace the discontinued B04-SID40X80S, select the SAID40X80S, which provides a direct solution preserving the G1/4 port, M12x1.25 thread, and ISO 15552 mounting dimensions. Size both ways by verifying the 528 N @0.5 MPa equal force is sufficient; if more force is needed, step up to the 50 mm bore (825 N @0.5 MPa), or step down to the 32 mm bore (345 N) for lighter loads. A double-rod cylinder is the right choice when you need anti-rotation stability, equal push/pull force, or a back rod to mount a sensor cam. Mounting options include Basic, FA, LB, and TC brackets. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 80 mm stroke, side-load is minimal, but for any stroke >=300 mm, ensure adequate guide support to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X80S
- ✓ 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-SID40X80S FAQ
Yes, the B04-SID40X80S is discontinued. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X80S. The direct replacement is the SAID40X80S, which shares the identical ISO 15552 interface, 40 mm bore, 80 mm stroke, G1/4 port, and mounting options, while adding an upgraded piston seal.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm, the piston rod is 16 mm with an M12x1.25 thread, the air port is G1/4, and it includes 27 mm adjustable air cushions at each end. Speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X80S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X80S replacement — usually within 7-8 hours.