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Black polyolefin heat-shrink breakout boot with three legs, 10 in long

3M

3M HDBB-345-1-250 Heat Shrink Breakout Boot 3 breakout 4.9 in 2.32 in 10 in black

SKU CH-FY5M-C57K8

Heat-shrink breakout boot splits one cable into three, shrinking from 4.9 in to 2.32 in with 10 in length and abrasion-resistant polyolefin rated from -67 to 230 °F

  • Product colorBlack
  • Heat-shrink boot seals three cable legs from moisture and debris
  • Polyolefin construction resists abrasion and chemical exposure across the full length
  • Flame-retardant material meets safety requirements for harsh environments
  • Continuous operating range from -67 °F to 230 °F suits extreme temperatures
  • Shrinks from 4.9 in to 2.32 in ID for a tight, strain-relieving fit

Three-breakout polyolefin boot

The 3M HDBB-345-1-250 is a straight-blade heat-shrink breakout boot with three legs, designed for cable harnesses that need a single transition into multiple branches. It suits automotive, industrial and marine wiring jobs where a rugged, flame-retardant seal is required.

Semi-rigid material shrinks to seal

Supplied at 10 in long with a 4.9 in main inner diameter and 2 in per breakout, the tubing shrinks down to 2.32 in and 1 in respectively, gripping cable jackets without adhesive. The semi-rigid polyolefin wall reaches 0.13 in thick after shrinking, providing abrasion, acid and alkali resistance while freeing the installer from separate sleeving and tape.

Rated for -67 °F to 230 °F

The boot handles continuous temperatures from -67 °F to 230 °F, giving wide environmental headroom for engine bays or outdoor equipment. It is not suited for applications that demand a higher shrink ratio, dielectric-strength certification or more than three breakout legs.

How it compares

Measured against everything we stock in AC Plugs & USB Wall Chargers, at today’s prices. Recalculated every night.

Price $79.99
Pricier than about 90% of the 547 comparable items (median $17.99).

Specifications

Product
Brand name3m
Product colorBlack

Questions about this item

What is the maximum continuous operating temperature for the HDBB-345-1-250 boot?

The boot is rated for a temperature range of -67 degrees to 230 degrees Fahrenheit.

How much heat does the polyolefin material generate or retain when the boot is shrunk in place all day?

The semi-rigid polyolefin material does not generate heat; it insulates and protects cables across the rated temperature range.

What cable diameters must I already have so the three breakouts fit after shrinking?

Each breakout shrinks to 1 inch inner diameter, so your three cables must be smaller than that to fit inside.

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