This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X450, 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-SID40X450
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X450, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X450
- 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-SID40X450
The B04-SID40X450 is an AirTAC construction-machinery dedicated double-rod ISO 15552 cylinder. The B04- prefix denotes a heavy-equipment variant that is mechanically identical to the base SID40X450. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal both ways (528 N @0.5 MPa). It features a 40mm bore, G1/4 port, M12x1.25 rod thread, and 27mm adjustable cushions. This SKU has no -S magnet and cannot take a sensor.
This SID model is discontinued. The direct replacement is the SAID40X450, sharing the same ISO 15552 mounting interface, bore, stroke, and force. The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. A plain cylinder does not hold loads on air loss; the cushion only decelerates. For held loads, use an external rod lock or SAIL/BSAI variant.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X450 |
| Bore size | Ø40 mm |
| Stroke | 450 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-SAID40X450 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-SAID40X450 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-SID40X450
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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-SID40X450 Is Used
Excavator Linkage
Equal push and pull force on a 450mm stroke drives dual-action construction machinery linkage without requiring a larger bore.
Heavy Equipment Transfer
The double-rod design provides anti-rotation stability for moving heavy components along an assembly line.
Dual-Tool Actuation
A rod exiting both ends simultaneously drives two separate mechanisms on a heavy-equipment fixture from one piston.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450 with the B04-SAID40X450
To replace the discontinued B04-SID40X450, use the SAID40X450 directly; it preserves the ISO 15552 mounting interface, G1/4 port, and equal-both-ways force. Size both ways by checking neighboring bores (32mm or 50mm) if you need to adjust the 528 N @0.5 MPa force. Choose a double-rod cylinder when you need anti-rotation, to drive two tools, or to mount a sensor cam on the back rod. Reuse FA, LB, or TC mounts. For the 450mm stroke, use external guides to prevent rod bending and side loads. This SKU lacks the -S magnet, so it cannot use magnetic switches.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X450
- ✓ 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-SID40X450 FAQ
Yes, the B04-SID40X450 (construction-machinery dedicated variant of SID40X450) is discontinued. The direct replacement is the SAID40X450. It shares the same ISO 15552 interface, 40mm bore, 450mm stroke, G1/4 port, and force. The SAI family adds an upgraded piston seal and SAIL/BSAI lock variants.
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 air port is G1/4. The cushion only decelerates; it does not hold loads on air loss.
Related AirTAC SAI Cylinders
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