Twisted Wire Brush Construction
A Brush is a Tool
The purpose of a brush is to clean and/or score a contaminated surface, and the design/selection of the brush is vital to its performance. Mill-Rose brushes effectively balance the following design criteria, maximizing performance and life while minimizing required power:
- Length and diameter of the fill wire
- Hardness and durability of the fill wire
- Strength and flexibility (length & diameter) of the stem wire
For example, Mill-Rose fitting brushes are designed to clean and score the fitting, allowing for a stronger solder joint. These brushes are manufactured with the highest quality fill wire, trimmed so the tip of the wire does the work (scoring).
| (Actual) O.D. Fitting Size | (Nominal) I.D. Fitting Size |
|---|---|
| 1/4" | 1/8" |
| 3/8" | 1/4" |
| 1/2" | 3/8" |
| 5/8" | 1/2" |
| 3/4" | 5/8" |
| 7/8" | 3/4" |
| 1" | 7/8" |
| 1-1/8" | 1" |
| 1-3/8" | 1-1/4" |
| 1-5/8" | 1-1/2" |
| 2-1/8" | 2" |
| 2-5/8" | 2-1/2" |
Usage
First, select the proper brush, referring to the sizing chart. O.D. (actual) sizes are generally specified for refrigeration fittings. I.D. (nominal) sizes are generally specified for plumbing fittings.
Second, always rotate the brush in a clockwise direction when the brush points away from the user. This tightens the brush construction.
Warning: Reversing a twisted-in-wire brush may loosen the stem wire causing a loss of fill bristles.
Wire Gauges
Decimal equivalent in inches & diameter in millimeters.
| Guage # | Diameter in Inches | Diameter in Milimeters |
|---|---|---|
| 20 | .035 | .89 |
| 23 | .026 | .66 |
| 24 | .023 | .58 |
| 25 | .020 | .51 |
| 26 | .018 | .46 |
| 28 | .016 | .41 |
| 30 | .014 | .36 |
| 32 | .0128 | .33 |
| 33 | .0118 | .30 |
| 34 | .0104 | .26 |
| 35 | .0095 | .24 |
| 36 | .009 | .23 |
| 38 | .008 | .20 |
| 43 | .006 | .15 |
| 47 | .005 | .13 |
MORE INFORMATION
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Twisted Wire Brush Construction
SINGLE STEM - Single Spiral
Brush fill bristles are twisted between two (2) stem wires with a single stem wire on each side of the fill wire.
DOUBLE STEM - Single Spiral
Brush fill bristles are twisted between four (4) stem wires with two stem wires on either side of the fill wire.
DOUBLE STEM - Double Spiral
Brush fill bristles are twisted between four (4) stem wires with two (2) layers of fill bristles. Fill bristle layers are perpendicular to each other.
