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Black polyolefin heat-shrink breakout boot with four legs, semi-rigid finish, adhesive-lined interior

3M

3M HDBB-420-1-250 Heat Shrink Breakout Boot

SKU CH-8151-MWPX9

Adhesive-lined polyolefin boot splits one cable into four breakouts, shrinking from 2.35 in to 1 in main and 1 in to 0.35 in branches for strain relief

  • Color MappingBlack
  • TypeCable Management & Conduit
  • Four-way cable breakout for organised routing
  • Adhesive-lined polyolefin seals against moisture ingress
  • Shrinks from 2.35 in to 1 in main ID
  • Withstands -67 °F to 230 °F operating range
  • Abrasion and chemical resistant 0.15 in wall

Four-leg polyolefin boot

The 3M HDBB-420-1-250 is a black semi-rigid heat-shrink breakout boot with four legs. It seals and strain-relieves multi-conductor cable splits in automotive, industrial and marine wiring harnesses where abrasion and chemical resistance are required.

Flame-retardant sleeve to 230 °F

Polyolefin construction withstands temperatures from -67 °F to 230 °F and resists acid, alkali and mechanical wear. The main body shrinks from 2.35 in to 1 in inside diameter while each leg shrinks from 1 in to 0.35 in, forming a tight seal with a 0.15 in recovered wall thickness.

Replaces tape or moulded boots on four-way splices

Use when a single-piece, adhesive-lined transition is preferred over separate caps or tape wraps. Not suited for installations needing a defined shrink ratio, a specific dielectric strength rating or more than four breakout legs.

Highlights

  • Four-way cable breakout for organised routing
  • Adhesive-lined polyolefin seals against moisture ingress
  • Shrinks from 2.35 in to 1 in main ID
  • Withstands -67 °F to 230 °F operating range
  • Abrasion and chemical resistant 0.15 in wall

Specifications

Brand3M
Color MappingBlack
TypeCable Management & Conduit

Questions about this item

How do I install the 3M HDBB-420-1-250 heat shrink breakout boot, and what step is most often missed?

Slide the boot over the cable bundle before making connections, then apply heat evenly until the main body shrinks from 2.35 in to 1 in and each of the four breakouts shrinks from 1 in to .35 in; the step most often missed is heating the adhesive-lined interior long enough for the liner to flow and seal.

What maintenance or replacement will the 3M HDBB-420-1-250 boot need later?

The polyolefin boot is abrasion resistant and acid and alkali resistant, so it requires no scheduled maintenance; replace it only if physical damage cracks the .15 in recovered wall or if the adhesive seal is broken.

What is the first limit that appears under sustained use of the 3M HDBB-420-1-250 boot?

Continuous exposure above 230 degrees F will degrade the material, so the temperature ceiling is the first limit encountered in sustained high-heat environments.

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