This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X500S, 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-SID50X500S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X500S
- 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-SID50X500S
The AirTAC B04-SID50X500S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant, mechanically identical to the standard SID50X500S. This discontinued model is fully replaced by the SAID50X500S, which reuses the exact G1/4 port, M16x1.5 rod thread, and ISO 15552 mounting interface. The SAI replacement also uses an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Because both faces use the rod-side area, force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that a plain cylinder does not hold loads on air loss; the air cushion only decelerates near stroke end.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X500S |
| Bore size | Ø50 mm |
| Stroke | 500 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID50X500S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The B04-SAID50X500S 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-SID50X500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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-SID50X500S Is Used
Excavator Linkage Control
Drives dual-tool mechanisms on heavy equipment with equal both ways force, utilizing the back rod end to mount a sensor cam for precise positioning feedback.
Crane Extension Sync
Provides anti-rotation stability and equal push/pull force for synchronized load handling on construction cranes, ensuring smooth extension and retraction.
Concrete Pump Actuation
Handles rugged concrete machinery actuation where the double-rod design delivers consistent force in both directions and the ISO 15552 interface allows easy mounting.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X500S with the B04-SAID50X500S
To replace the discontinued B04-SID50X500S, drop in the SAID50X500S directly—it matches the 50mm bore, 500mm stroke, G1/4 port, and ISO 15552 mounting dimensions without altering your construction-machinery layout. Size both ways by verifying the equal push/pull force (825 N @0.5 MPa) meets your requirement, or step to neighbouring bores (40mm or 63mm) if higher or lower equal-both-ways force is needed. A double rod is right when you need anti-rotation stability, or when the back rod carries a sensor cam to drive two tools. Reuse FA, LB, or TC mounts. The -S magnet enables position sensing. For this 500mm stroke, external guides are recommended to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X500S
- ✓ 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-SID50X500S FAQ
Yes, the B04-SID50X500S is discontinued. The direct replacement is the SAID50X500S. The B04- prefix simply marks it as the construction-machinery dedicated variant, so the SAID50X500S matches the 50mm bore, 500mm stroke, G1/4 port, and ISO 15552 mounting perfectly. The SAI family also adds SAIL and BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore is 50mm with a G1/4 air port and M16x1.5 rod thread. It operates at 0.15-1.0 MPa with adjustable 30mm cushions at each end.
Related AirTAC SAI Cylinders
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