BKL Electronic 074428 Heat Shrink Tubing, Black, 3:1, 12 mm to 4 mm, 50 m Roll

For electricians and maintenance technicians who need reliable insulation and strain relief in cable harnesses, control cabinets, and automotive wiring, this heat shrink tubing provides a tight, protective seal. The black polyolefin sleeve shrinks from 12 mm to 4 mm when heated, conforming closely to irregular shapes and offering durable protection against abrasion and environmental stress.

Key specifications

• Shrink ratio: 3:1
• Supplied diameter: 12 mm
• Recovered diameter: 4 mm
• Length: 50 m
• Colour: Black
• Material: Polyolefin
• Operating temperature range: -55°C to +125°C
• Minimum shrink temperature: +70°C
• Full recovery temperature: +110°C
• Dielectric strength: 15 kV/mm
• Tensile strength: 10.4 MPa
• Flammability rating: VW-1

Why choose it

The 3:1 shrink ratio allows the tubing to cover a wide range of connector and splice sizes, reducing the need for multiple sizes in stock. Its polyolefin construction offers excellent electrical insulation and resistance to common chemicals and solvents, ensuring long-term reliability in demanding environments.

Ideal use cases

• Insulating and protecting electrical splices and terminations
• Bundling and organising cables in harnesses
• Providing strain relief for connectors and breakouts
• Sealing against moisture and dust in outdoor or industrial settings

Good to know

Supplied on a 50 m roll, this tubing can be cut to the exact length needed for each job. It is suitable for use with a heat gun or other controlled heat source; avoid open flames to prevent uneven shrinking or damage.