Brady M-250-1-342 Permasleeve Heat-Shrink Wire Marker, Black on White, 25.78 x 11.15 mm, for 2.39-5.46 mm Diameter, 80 Markers 143228

For electricians and panel builders labeling wires and cables in industrial control cabinets, the Brady M-250-1-342 Permasleeve marker provides permanent identification that stays legible even in demanding environments. Each black-on-white polyolefin sleeve shrinks tightly around the wire when heated, creating a durable, non-adhesive label that resists abrasion, chemicals, and UV exposure.

Key specifications

• Material: Polyolefin
• Print colour: Black on white
• Flat width: 11.15 mm
• Length: 25.78 mm
• Wire diameter range: 2.39–5.46 mm
• Shrink ratio: 3:1
• Operating temperature: -55°C to 135°C
• Quantity per pack: 80 markers

Why choose it

The Permasleeve series is engineered for reliable wire marking. The 3:1 shrink ratio allows each sleeve to fit a range of wire sizes, reducing the number of marker sizes you need to stock. Thermal transfer printing ensures crisp, smudge-resistant text that remains readable after installation.

Ideal use cases

• Identifying wires in control panels and switchgear
• Labeling cables in industrial machinery and automation systems
• Creating permanent markings for maintenance and repair work

Good to know

These markers are supplied as flat sleeves and require a heat source for shrinking. They are non-adhesive and rely on shrink-to-fit for secure placement.