This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X400, 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-SID40X400
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X400
- 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-SID40X400
The B04-SID40X400 is an AirTAC construction-machinery dedicated ISO 15552 double-acting double-rod cylinder; the B04- prefix denotes a heavy-equipment industry variant that is mechanically identical to the base SID40X400. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal at 528 N @0.5 MPa, 739 N @0.7 MPa and 950 N @0.9 MPa. It has a 16 mm rod, M12x1.25 thread and G1/4 port. This SID model is discontinued; the direct replacement is the SAID40X400, which adds an upgraded two Y-shaped one-way piston seal for low start-up pressure.
The double-rod design prevents rod-side rotation and lets the back rod drive a second tool. With no -S magnet, this SKU cannot take a magnetic switch. A plain cylinder does not hold loads on air loss—the cushion only decelerates near stroke end—so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X400 |
| Bore size | Ø40 mm |
| Stroke | 400 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-SAID40X400 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-SAID40X400 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-SID40X400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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-SID40X400 Is Used
Excavator Linkage Actuation
Provides equal push and pull force for moving secondary construction machinery covers, where the double-rod prevents rotation during operation.
Heavy Equipment Gate Control
Drives dual access panels on heavy equipment using both extending rods, ensuring synchronized motion without needing a separate cylinder.
Loader Tool Synchronization
Simultaneously operates two secondary tools on a loader backhoe, using the equal both-ways force to maintain balanced clamping.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400 with the B04-SAID40X400
Replace the discontinued B04-SID40X400 directly with the SAID40X400: it shares the exact ISO 15552 interface, 40 mm bore, 400 mm stroke, G1/4 port and equal-both-ways force. Size both directions by checking neighbouring bores (32 mm or 50 mm) against your force needs, remembering the push and pull are identical. Choose a double-rod cylinder when you need anti-rotation or must drive two tools. Reuse FA, LB or TC mounts. As this is a non-magnetised SKU, it cannot take sensors. For the 400 mm stroke, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X400
- ✓ 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-SID40X400 FAQ
Yes, the B04-SID40X400 (construction-machinery dedicated variant of SID40X400) is discontinued. The direct replacement is the SAID40X400, offering the same ISO 15552 interface, bore, stroke and G1/4 port, but with 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 air port is G1/4.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X400
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X400 replacement — usually within 7-8 hours.