This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X50S, 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-SID50X50S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X50S
- 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-SID50X50S
The AirTAC B04-SID50X50S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SID50X50S, mechanically identical in every spec. A rod exits both ends on a single piston, meaning both faces use the rod-side area and push/pull force is equal both ways (825 N @0.5 MPa). It features a Ø20 mm rod, M16x1.5 thread, G1/4 port, and 30 mm adjustable cushions. This SID model is discontinued and the direct replacement is the SAID50X50S.
The SAID upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while reusing the exact ISO 15552 mounting interface. Because the second rod can carry a sensor cam or drive two tools simultaneously, it provides inherent anti-rotation. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X50S |
| Bore size | Ø50 mm |
| Stroke | 50 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-SAID50X50S 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-SAID50X50S 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-SID50X50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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-SID50X50S Is Used
Excavator Linkage Actuation
Equal push/pull force drives secondary linkage arms on heavy equipment, using the double-rod geometry to prevent rotational drift during repetitive digging cycles.
Crusher Tool Sync
The twin rods drive opposing crushing or clamping tools simultaneously, ensuring parallel force distribution in harsh construction-material processing environments.
Sensor Cam Tracking
The rear extension rod carries a cam for legacy CS1-B/DS1-B position switches, providing feedback on hatch or gate positions without taking up primary tool space.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50S with the B04-SAID50X50S
To replace the discontinued B04-SID50X50S, specify the SAID50X50S, which matches the 50 mm bore, 50 mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). Size both directions by verifying the equal force fits your load, stepping to neighbour bores (63 mm yields 1402 N @0.5 MPa) if more power is needed. A double rod is right when you need anti-rotation, a back rod for a sensor cam, or to drive two tools. Choose the -S option for magnet sensors. For this 50 mm stroke, side-load is minimal, but for any stroke >=300 mm, ensure guide alignment to prevent binding. Note: air cushions only decelerate; they do not hold loads on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X50S
- ✓ 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-SID50X50S FAQ
Yes, the SID series is discontinued. The B04- prefix marks this as the construction-machinery dedicated variant of the base SID50X50S. The direct replacement is the SAID50X50S, which shares the identical ISO 15552 interface, bore, stroke, G1/4 port, and force. The SAI upgrade adds a two Y-shaped one-way piston seal for longer life.
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 50 mm with a G1/4 air port, a Ø20 mm rod, and M16x1.5 thread. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL/BSAI variant for held loads.
Related AirTAC SAI Cylinders
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