What are the parts of a brush called?
Four names cover any brush: the fill that does the work, the backing or core that holds it, the retention method that anchors one to the other, and the interface that joins the brush to a hand or a machine. Every dimension on a drawing is measured against one of them. Use the right words and a specification stops describing what a brush looks like and starts stating what it has to do.
What does each part decide?
| Term | What it names | Why it matters |
|---|---|---|
| Fill | The filament, wire or fiber that touches the work. Also called bristle or fill material. | It sets what the brush removes and what it damages, so it is chosen before any dimension. |
| Tuft | One bundle of fill held in one hole or one clamp. | Density is counted per tuft and per unit area, so the tuft layout makes one head stiffer than another at the same trim length. |
| Backing / Core | The block, channel, disc, tube core or wheel center the fill is anchored in. | It carries the load and sets the chemical and temperature limit of the assembly, often lower than the fill’s own. |
| Trim length | The exposed fill, measured from the holding face to the tip. | Stiffness falls steeply as trim grows. It is the easiest number to change and the easiest to get wrong. |
| Ferrule | A metal band crimped around the base of the fill that clamps it and joins the head to the handle, as on a paint brush. | On an anti-static brush a metal ferrule can be part of the ground path. Where the fill is set in epoxy instead, that joint, not the band, sets the solvent and temperature limit. |
| Interface | Arbor hole, threaded stem, shaft, flange, clinch ring, channel or plain handle. | This decides whether a brush fits the machine you already own. |
Which dimensions do we publish, and how are they measured?
Every product page here gives these where they apply, so two brushes can be compared without translating anyone’s house vocabulary.
| Dimension | How it is measured |
|---|---|
| Head diameter | Across the working face, tip to tip. |
| Head length and width | Along and across the filled area, for rollers, strips and plates. |
| Trim length | From the holding face to the filament tip, free length only. |
| Filament diameter | Of one filament or wire, not of the tuft. |
| Handle length and grip diameter | Of the handle alone, where there is one. |
| Overall length | End to end, including handle and stem. |
How is the fill held in place?
Retention is a separate decision from the fill, and it fails on its own terms: a brush can lose its fill while every filament is still good.
- Staple-set: tufts folded over a metal staple into a drilled hole. The usual construction for blocks, discs and plates.
- Twisted-in-wire: fill trapped between two wires twisted together, which then become the stem. Standard for bore and tube brushes.
- Channel or strip: fill clamped into a rolled metal or plastic channel, then cut, coiled or mounted to length.
- Resin-set: fill bedded in cured resin, used where a staple hole or wire stem is not acceptable. Hygienic contact surfaces are the usual reason.
- Crimped or knotted: two forms of wire for wheels and cups. Crimped is softer and finishes; knotted is aggressive and removes.
Which words mean something specific on this site?
Several terms name more than one object, and a specification written with the wrong one arrives as the wrong brush.
- Filter brush here is a brush that is the filter medium: an open radial fill sitting in flowing water to hold solids and carry bacteria. A brush used to clean a filter screen is a handheld detail brush.
- Wheel brush is a powered wire wheel on a spindle. A long-handled brush for washing a car wheel is a handheld brush, whatever a catalog calls it.
- Cup brush describes the shape of the brush body, not a drinking cup.
- Gutter, on a road sweeper, is the channel at the curb, not a roof gutter.
