We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White heat-shrink sleeves on a roll with black print

Brady Corporation

Brady PermaSleeve Heat-Shrink Sleeves M21-187-C-342 Black On White

SKU CH-46QX-HQFSA

Heat-shrink polyolefin sleeves with 3:1 ratio print on Brady printers for permanent wire identification and insulation from -55 °C to +135 °C

  • Permanent wire identification with fade-resistant B-342 polyolefin
  • 3:1 shrink ratio insulates and protects cables in extreme heat
  • Thermal-transfer and dot-matrix printable for clear, legible markings
  • Withstands -55 °C to +135 °C for harsh environments
  • Fire-retardant material meets demanding safety requirements

Wire-marking heat-shrink sleeves

Brady PermaSleeve M21-187-C-342 sleeves are non-adhesive polyolefin tubes that shrink 3:1 around wires or cables for permanent identification and insulation. They accept thermal-transfer or dot-matrix printing in black on white for clear, legible markings that resist fading in harsh environments.

Check printer and wire dimensions

Verify that your Brady printer supports thermal-transfer or dot-matrix output on B-342 material and that the sleeve inner diameter before shrinking fits the wire bundle you intend to mark. Confirm the 3:1 shrink ratio will fully cover the conductor after heating with an industrial-grade heat gun.

Stable in sustained temperature extremes

The irradiated polyolefin operates continuously from -55 °C to +135 °C and is fire-retardant, so markings remain legible and the sleeve retains its grip during prolonged exposure to temperature cycling, abrasion and chemical contact.

How it compares

Measured against everything we stock in Labels, Label Makers & Tapes, at today’s prices. Recalculated every night.

Price $40.99
Pricier than about 80% of the 2,454 comparable items (median $22.99).

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the M21-187-C-342 pack and do I need a separate printer?

The pack contains heat-shrink sleeves made from B 342 polyolefin material. You need a Brady thermal-transfer or dot-matrix printer to print on them, plus an industrial-grade heat gun to shrink the sleeves onto wires.

How do I choose between the available B 342 colours for my wiring job?

B 342 sleeves come in white, yellow, black, red, orange, green, blue, violet, pink, grey and brown. Pick a colour that contrasts with your wire insulation and matches any site colour-coding standard you follow.

What does the 3:1 shrink ratio mean when the sleeve is on a real cable?

A 3:1 ratio means the tubing shrinks to one-third of its supplied diameter when heated, gripping the cable tightly for permanent identification and insulation from -55 °C to +135 °C.

More in Labels, Label Makers & Tapes

Similar items