25mm PA66 Tube Brush

A 25mm PA66 Tube Brush is a manual internal-cleaning brush with a twisted-wire core, a 120mm round working head filled with PA66 nylon filament, and a fixed polypropylene handle. The 25mm figure is the nominal diameter measured across the bristle tips; it is selected to match the internal diameter of the tube being cleaned.

In use, the operator inserts the head into the tube or port, then pushes, pulls, or rotates the handle so the filament tips sweep the internal wall. On straight tube runs the bristles stay in full contact around the circumference; at the bottom of a blind hole, the filament tips work debris loose from the closed end. The brush is normally used by hand, although the stem and connection can be changed to suit a machine or extension when the project requires it.

This is a mechanical cleaning tool. It loosens and removes attached residue; it does not flush, chemically descale, or passivate the tube. The standard PA66 filament is intended for chips, oil, coolant, light scale, carbon films, and similar process deposits. For hard rust, baked scale, weld spatter, or heavy carbon, a wire or abrasive brush remains the more appropriate tool.

Operating limits come mainly from the filament material and stem. PA66 softens if run too hot or too fast under heavy interference, so a manual stroke with reasonable speed is the standard use case. The stem should not be bent repeatedly at sharp angles, and the brush should not be forced through a tube measurably smaller than the head diameter.

The values below are the standard configuration for this product. Diameter, head length, handle length, filament size, stem material, and trim profile can be adjusted to the tube chart or production standard you are cleaning to.

The recommended tube ID row assumes a straight or gently curved tube. For tight U-bends, spirals, or tubes with heavy internal obstructions, allow more clearance or choose a smaller diameter head.

• Shell-and-tube heat exchangers, condensers, and evaporators where 22 to 25 mm ID tubes collect oil films, coolant residue, light scale, and sludge between chemical cleanings. The brush provides mechanical action that loosens deposits before flushing or circulation.
• Hydraulic manifolds, valve bodies, and spool bores after machining or assembly, where chips, lapping compound, and coolant remain in ports, cross holes, and internal threads and a wire brush would risk damaging sealing surfaces.
• Coolant and oil galleries in engine blocks, gear cases, and transmission housings, including intersecting passages and blind holes that need debris removed before component assembly.
• Tube ends, pipe stubs, filter housings, pump bodies, and nozzles with light process deposits or dried product on the internal diameter.
• Pre-cleaning and final brush-out of tube interiors before inspection, pressure testing, coating, or reassembly.

Start with the tube ID, not the brush diameter

Measure the internal diameter at the mouth, along straight sections, and at any bend or reducer. For a 25 mm nominal head, straight tubes with an ID of 22 to 25 mm receive firm full-circumference contact. Tubes with a 26 to 28 mm ID can still be cleaned when the residue is light or the goal is a rubbing action, but loaded or bonded deposits will not be fully contacted.

Match the filament to the residue and surface

PA66 is a stiff nylon filament with good wet strength and resistance to petroleum-based oils, coolants, and mild alkaline cleaners. Choose it when the residue is chips, coolant, oil, light scale, carbon film, powder, or dried product and the tube wall is copper, brass, aluminum, stainless, or steel that should not be scored by metallic wire. If the deposit is hard rust, mineral scale, weld spatter, high-temperature carbon, or baked varnish, a stainless steel or brass wire tube brush, or a silicon-carbide-impregnated nylon tube brush, will be more effective. For strong acids, phenols, or oxidizers, PA66 is not the right filament; specify a chemically resistant polymer for that environment.

Set the bristled length from the tube depth

The standard 120mm head cleans about 120mm of bore per insertion. Short tube stubs, nozzles, ports, and valve bores match this well. For tube runs longer than 200mm, either pass the brush in overlapping strokes or specify a longer bristled section. The handle length must also leave enough working length outside the tube for the operator to grip and control the tool.

Decide between manual and powered use

The fixed PP handle is designed for manual reciprocation and light rotation. If the cleaning station uses an extension, drill, or machine feed, the stem and connection should be changed to a shank or coupling design before ordering. Powered rotation can be used with PA66 filament, but high speed combined with tight interference will heat the filament and shorten its life. Confirm the maximum RPM or feed rate beforehand.

Use it as part of the full cleaning sequence

Brushing removes attached material but does not replace rinsing, chemical descaling, passivation, flushing, or borescope inspection. A heavily plugged or scaled tube should be rodded or chemically treated before brushing, not after.

Yes. The standard 25mm PA66 configuration is a starting point. For a project-specific part, we will need the tube ID, tube length, bend radius, surface material, residue type, cleaning chemical, operating temperature, and whether the brush will be used by hand or in a machine. A drawing, tube sample, or photo of the fouled tube helps close the details faster.

• Head diameter: adjust to the actual tube ID from roughly 15 mm to 40 mm or more; match the selected interference.
• Bristled head length: extend or shorten the 120 mm working section for the tube depth.
• Filament size and trim: choose 0.30 to 0.50 mm PA66 filament, set fill density, use crimped or flagged filament, or change the end profile to round, flat, or end-tuft for blind holes.
• Stem or core: galvanized steel, 304 or 316 stainless, coated wire, or a flexible polymer cable for curved passages.
• Handle: PP standard; change length, grip diameter, shape, overmold, hanging hole, or use a threaded, quick-connect, or machine shank interface.
• Color and marking: custom handle or filament color, pad print, laser marking, or barcode labeling for tool-room identification.
• Packaging: bulk, individual polybag, kit, shelf box, or project-specific packing for MRO or resale.

If the application requires project-specific material documentation, inspection records, or third-party testing support, we can assist with those requirements during the customization process.