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Junk Mill

Mills you can depend on

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Drillstar Junk Mills are designed for heavy-duty milling jobs and are the fruit of over 20 years of experience in design and hardfacing.

Whatever the application, plug removal, cement, drill collar or general milling jobs, one of our five standard designs will tackle it efficiently: Conventional, Integral Bladed, Flat Bottom, Super and Conebuster Junk Mills.
Our mills are available in a variety of standard and custom sizes, with or without stabilizing blades.

These downhole tools can be hardfaced with your choice of TOPLOY (tungsten carbide grains) or cutting inserts : TOPMILL (square) or SWORDFISH (shaped). Inserts enable better ROP and tool life.

All mills can be hardfaced using TOPLOY S : excellent behaviour thanks to its matrix specially designed to release worn grains. Integral Bladed Mills and Super Junk Mills can be hardfaced using tungsten carbide inserts backed by TOPLOY S. Inserts enable better ROP and tool life, while TOPLOY backing significantly improves the hardfacing resistance to downhole shocks. Two standard types of inserts are available : TOPMILL square inserts, or SWORDFISH® shaped inserts. Custom inserts are available on request.

Drillstar cutting inserts are made of premium cutting grade tungsten carbide, and can replace TOPLOY on most milling tools. They enable you to mill faster and longer, while reducing the necessary weight on bit.

These large, square-shaped tungsten carbide inserts are widely used today for all milling applications.

These innovative inserts combine the advantages of both square and round-shaped models (exclusivity from Cutting & Wear).

Standard dimensions

Top thread
3½" - 4½"2⅜"20"12"3⅛ "
4½" - 5½"2⅞"21"12"3¾"
5½" - 5⅝"3½"23"12"4¼"
5¾" - 7½"3½"23"12"4¾"
7½" - 9"4½"27"12"5¾"
9½" - 12¼"6⅝"29"12"7¾"
13" - 15"6⅝", 7⅝"30"12"7¾", 9½"
17" - 17½"7⅝"33"12"8¾", 9½"
18½" – 26"7⅝", 8⅝"37"18"9½", 9¾"

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Tel : +33 (0) 559 130 100