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Pen Brush Colour Chart

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The WanHu pen brush colour chart showing all ten colour options. Specifications: Diameter: 5mm · Length: 50mm · Core Diameter: 2.35mm.

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SKU: WANHU-PB-34 Category: Polishing Brush Tags: Multi-Colour, Reference Charts

Description

Product description

This WanHu colour chart is made from mixed materials. Part of the Colour Chart range, it comes in several colours and sizes so you can match it to your machine and finish requirement.

Uses

Suitable for cleaning, deburring and polishing metal, jewellery, moulds and woodwork. Mount the colour chart at moderate speed and let the bristles do the work — excess pressure shortens service life.

Specifications

Diameter	5mm
Length	50mm
Core Diameter	2.35mm

More colours & sizes in this range

Additional information

Diameter	5mm
Length	50mm
Core Diameter	2.35mm

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Safe Operating Speed

A bigger wheel must run slower. The limit is set by peripheral speed (how fast the rim travels), not by a fixed RPM number — so the safe RPM drops as the diameter grows.

Recommended peripheral speed20–30 m/sGeneral standard for metal mirror finishing

Above 30 m/sDo not runWheel can shed or burst, and the workpiece burns black

Safe maximum speed by wheel diameter
Wheel diameter	Spec code	Max. safe speed	Peripheral speed at that limit
Ø 100 mm4"	`4 × 50`	≤ 6,000 RPMMaker rating on small wheels — the arbor and guard set the real ceiling	31.4 m/s
Ø 150 mm6"	`6 × 50`	≤ 3,000 RPMMost common size — many makers rate it at 2,800 RPM	23.6 m/s
Ø 200 mm8"	`8 × 50`	≤ 2,200 RPM	23.0 m/s
Ø 250 mm10"	`10 × 50`	≤ 1,800 RPM	23.6 m/s
Ø 300 mm12"	`12 × 50`	≤ 1,400 RPM	22.0 m/s

Spec code format: diameter (inch) × ply count — 4 × 50, 5 × 50, 6 × 50, 7 × 50, 8 × 50, where 50 ply means 50 cotton layers. Finished thickness is 12 mm across the whole range.