12mm SS304 Tube Brush

A 12mm SS304 Tube Brush is a small-diameter wire tube brush with an approximately 12 mm round cleaning head. Stainless steel 304 filaments are mechanically twisted into a double-wire SS304 core, locking the filament ends outward along the entire head length. The brush is inserted into heat exchanger tubes, coolant galleries, hydraulic ports, fitting bores, and other circular internal cavities, then stroked and rotated to dislodge attached deposits.

During use the stem leads into the bore, and the head follows. Cleaning pressure comes from bristle interference against the bore wall, not from heavy manual force. The twisted wire construction creates a continuous spiral contact line, which removes deposit from both the leading edge and the sidewall in one motion. A threaded removable connection joins the head to the operating stem or an extension.

This is not a polishing or finishing brush. SS304 wire leaves fine scratch marks on polished, plated, or soft metal surfaces, and a broken filament can remain in the bore if the process does not include flushing. It is also not a replacement for chemical descaling, pickling, or honing when the deposit is mineral-bonded, pitted into the base metal, or hard enough to exceed the mechanical limit of the wire.

The table lists the standard 12mm SS304 wire tube brush configuration. Parameters marked as configurable can be adjusted at order to the actual tube or bore.

If the tube is blind or has an internal stop, head length should be shortened so the operator can reach the full cleaning zone without bottoming the stem against the end.

• Heat exchanger tube internal cleaning — straight and shallow-curve tubes in condensers, evaporative coolers, oil coolers, and boiler circuits with IDs around 12 mm that collect scale, sludge, corrosion film, and process deposits.
• Hydraulic manifolds and valve bodies — intersecting cross holes, spool bores, sensor ports, and short galleries loaded with dried oil, chips, grinding dust, and assembly debris.
• Fittings and threaded sockets — internal threads, seat areas, and pre-assembly bores where old sealant, rust, and dirt must be cleared before a leak-tight connection.
• Mold and die coolant channels — gun-drilled water lines, ejector pin bores, and small connector passages with baked coolant film and mineral scale.
• Pump and filter housings — suction/discharge ports, drain holes, and transfer bores with varnish, powder, and light corrosion.

For bore IDs well outside the 11.5–14 mm range, a different nominal diameter is required; see the selection guidance below.

Start with the smallest cross-section the brush must pass through, including any fitting, step, bend, or thread root. A tube brush only cleans where the bristles carry interference against the wall. Too little interference means the brush slides through without removing adhered film; too much means wire ends fold back, snap, or wedge the head.

Filament weight and fill density: Finer wire follows threads, steps, and cross holes with less breakage and is easier to push through curved passages. Heavier wire removes hard scale, rust, and carbon faster but produces more insertion resistance and sheds wire fragments as it fatigues. Specify the deposit thickness and number of obstructions when defining wire gauge.

Reach and connection: Overall length must cover the full tube depth plus the grip allowance outside the bore. The threaded removable connection can take a matching extension for longer heat exchanger tubes, but every joint adds a catch point and reduces feel. For tubes substantially longer than a standard hand stroke setup, or for fully blocked tubes, a flexible shaft tube cleaner or powered rotary tube cleaning system is usually the better method.

When this brush is the wrong tool: Use a brass, nylon, or non-woven brush when the bore is titanium, plated, precision-honed, or must remain free of embedded steel particles. Use SS316, duplex, or a coated wire when the system carries seawater, high chloride scale, or hot reducing acids. Select a smaller or larger nominal diameter instead of forcing this 12 mm head into bores outside the 11.5–14 mm fit range.

The 12mm SS304 wire tube brush can be adjusted to the actual tube or bore without changing the basic twisted-in-wire construction. To define the custom configuration, send the minimum and maximum bore ID, full insertion depth, bend geometry, deposit type, cleaning chemical, hand or powered rotation, and the required thread or handle interface. A scrap tube section, drawing, or photo of the old worn brush reduces back-and-forth during sampling.

• Head length — 40–120 mm options so the wire contact zone matches the tube depth or restricted cavity
• Wire gauge and fill density — finer filaments for threads and curves, heavier filaments for scale, rust, and carbon removal
• Stem / handle length — standard 180 mm, extendable from 150 mm to 500 mm or segmented with matching threaded joints
• Threaded connection — thread size, pitch, and gender matched to your existing handle, extension rod, or powered driver
• Core construction — twisted SS304 standard; double-wire or reinforced core available for long reach or higher torque applications
• Handle / grip form — plain wire stem, loop end, knurled grip, hex shank for a drill chuck, or color-coded identification
• Marking — batch code, size marking, color band, or pad print on the handle where applicable
• Packaging — bulk, individual polybag, oil-treated anti-corrosion wrap, labeled boxes, or project-specific carton marking

SS304 is the default wire material described on this page. For chloride-heavy cleaning environments, ask about SS316 or coated wire alternatives for the project. If you need material certificates, inspection reports, dimensional records, or third-party testing to support incoming inspection or customer qualification, that documentation can be arranged with the batch.