Leviton 25-Pair M Block

Interconnect Phone & Communication Cables

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What's special about this wiring block?

  • Accepts 22 to 26 AWG wire for different phone or communications applications
  • Constructed of high impact, fire retardant UL 94V-0 plastic to meet code
  • Three remaining slots in each row can be used for cross-connects
  • Click for More Features

With Leviton's 25-pair M Block, you can quickly interconnect voice and data applications in a multiple-connection office building or apartment complex.


LE-40066-M25 M Block: 25-pair (66M1-25) 10" H x 3-5/16" W x 1-3/16" D
  • Compact design for limited space
  • Phosphor bronze quick-connecting, insulation-displacing 66-clips for durability and longevity
  • Includes 50 rows of clips, 25 on each side, to assist with a neat installation
  • Incoming cable pairs' "tips" and "rings" are connected by terminating "tip" on the leftmost slot of one row, and "ring" on the leftmost slot of the row
  • Wide range of punch down tools sold separately to conveniently attach the wires to the block


Part # LE-40066-M25
Height 10"
Width 3-5/16"
Depth 1-3/16"
Material UL 94 V-0 plastic
Number of Clips 50 rows, 25 per side
Wire Gauge 22 to 26 AWG





Snap-On Cover for M BlocksSnap-On Cover for M Blocks
Made of transparent plastic, it easily permits the viewing of wiring and pair assignments without removal.
Bridging ClipsBridging Clips
Price per pack
Bridging clips press onto the two center slots in any row of a Split M block. If outside cable pairs are terminated on the left-hand clips and station equipment wire is terminated on the right-hand clips, then connections can quickly be made or eliminated by simply inserting or removing the bridging clips.
Modular AdaptersModular Adapters
Modular adapters plug into M blocks to convert 66-clip contacts to a modular jack for quick connection of equipment.
Wire Distribution SpoolWire Distribution Spools
From each
Facilitate routing and fanning of cable, cross-connections, and jumper wires to any connection apparatus. Mount conveniently on backboard of distribution frame.
Leviton Split M BlockSplit M Block: 50-Pair
The Split M block contains 50 rows of clips, but instead of one 4-slot clip as the 25 pair M Block, each row contains two separate 2-slot clips.
Leviton M Block with Female & Male ConnectorsM Block with Female & Male Connectors
The 50-pair M block contains prewired, pretested 25-pair female connector on left and male connector on the right for the quickest installation. Easily plug in the connectors and insert bridging clips to complete the connections.
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