This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X50S, 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-SID40X50S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X50S
- 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-SID40X50S
The AirTAC B04-SID40X50S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID40X50S, mechanically identical to it. A rod exits both ends on one piston, meaning both faces use the rod-side area and push and pull force are equal 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-end thread, and a G1/4 air port. This legacy model is discontinued and the direct replacement is the SAID40X50S.
The SAID40X50S replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life, while retaining the same ISO 15552 mounting interface, bore, stroke, and force. Because the second rod can drive two tools or carry a sensor cam, it provides excellent anti-rotation stability. The built-in piston magnet (-S) supports legacy CS1-B/DS1-B switches, and adjustable 27 mm air cushions decelerate near stroke end.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X50S |
| Bore size | Ø40 mm |
| Stroke | 50 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-SAID40X50S 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-SAID40X50S 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-SID40X50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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-SID40X50S Is Used
Excavator Linkage Control
Uses the equal both-ways force and anti-rotation properties of the double rod to actuate secondary construction-machinery linkage guides without deflection.
Crusher Feed Diversion
Drives a dual-sided diverter gate on heavy-equipment feed conveyors, utilizing the G1/4 port and equal push/pull force to handle aggregate loads consistently.
Synchronized Drill Jigs
Employs rods exiting both ends to clamp and locate drilling jigs on construction-machinery frames, ensuring parallel alignment via the ISO 15552 interface.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50S with the B04-SAID40X50S
To replace the discontinued B04-SID40X50S, specify the SAID40X50S, which is a direct swap retaining the G1/4 port, M12x1.25 thread, and equal both-ways force of 528 N @0.5 MPa. If sizing both ways, neighboring bores are 32 mm (345 N) and 50 mm (825 N); choose based on the exact equal push/pull force required. A double-rod design is right when you need anti-rotation stability or must drive two tools simultaneously. You can reuse FA, LB, or TC ISO 15552 mounts. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches. For strokes over 300 mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X50S
- ✓ 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-SID40X50S FAQ
Yes, the B04-SID40X50S is discontinued. The direct replacement is the SAID40X50S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID40X50S, so the SAID40X50S matches its bore, stroke, G1/4 port, and ISO 15552 mounting exactly. The SAI family also adds an upgraded piston seal and SAIL/BSAI lock variants.
Force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. A plain cylinder does not hold loads on air loss; the 27 mm cushion only decelerates near stroke end. For held loads, use an external rod lock or the SAIL/BSAI variant.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X50S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X50S replacement — usually within 7-8 hours.