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Black heat-shrink tubing spool, 3 mm diameter, 5 m length

Unique-Bargains

Unique-Bargains 3:1 Heat Shrink Tubing 3 mm 5 m Black

SKU CH-T8JB-9KDXR

3 mm diameter heat-shrink tubing with a 3:1 shrink ratio, 5 m length, 1000 V rating and -40 °C to 125 °C operating range

  • 3:1 shrink ratio fits snugly over 3 mm wires
  • Continuous 5 m length covers multiple cable runs
  • 40 °C to 125 °C range withstands harsh environments
  • 1000 V rating insulates mains-voltage circuits safely
  • Waterproof, corrosion-resistant sleeve protects wiring long-term

3 mm Heat-Shrink Tubing for Electrical Work

This 3:1 ratio tubing shrinks from a 3 mm diameter to protect and insulate wires. Supplied as a 5 m length, it suits electricians, hobbyists and automotive technicians who need reliable cable sleeving. The 1000 V rating covers most low-voltage and mains-rated insulation tasks. Black colour allows simple colour-coding or discreet repairs.

Thermal Performance and Power Characteristics

Rated for continuous operation from -40 °C to 125 °C (-40 °F to 257 °F), the tubing retains flexibility and dielectric strength across extreme temperatures. It adds no electrical load, draws no power and produces no noise during normal use. High-temperature resistance prevents degradation near hot components or in engine bays.

Included Length and Practical Benefits

The single 5 m (16 ft) piece lets you cut custom lengths for wire bundling, strain relief or waterproof sealing. Corrosion resistance and high-strength toughness extend service life in damp or abrasive environments. Good electrical insulation and waterproof performance protect connections without additional sealants or tapes.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 97% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

How do I install the 3 mm heat-shrink tubing and what step is often missed?

Slide the tubing over the wire before making connections, apply heat evenly until it shrinks to the 3:1 ratio, and let it cool completely before handling.

Will the tubing need replacement if used continuously at high temperature?

The material is rated for -40 to +125 °C and resists corrosion and water, so it should not need replacement within that range.

What is the first limit reached when the tubing carries 1000 V under sustained load?

The 1000 V voltage rating is the primary electrical limit; exceeding it risks insulation breakdown before the temperature limit is reached.

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