MICRO 100 .320" Min Bore Diam, 1.250" Max Bore Depth, 3/8" Shank Diam., Solid Carbide Boring Bar

MICRO 100 .320" Min Bore Diam, 1.250" Max Bore Depth, 3/8" Shank Diam., Solid Carbide Boring Bar

Made In The USA
Item #: 21-102-157
Brand: MICRO 100
Type: Boring Bars
Minimum Bore: .320"
Maximum Bore Depth: 1.250"

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  • Elliptical necks for maximum rigidity.


  • Machine aluminum, copper, brass, steels, stainless steels, high temperature alloys, thermoplastics, exotic metals and composites.
  • Great opportunities with Swiss Type Screw Machines.
  • Works exceptionally well with the following machines: Tsugami, Starr, Okuma, Omni-Turn, Citizens, Tornos, Hass, Hardinge Conquest & Hardinge Gang
  • Also used on small CNC lathes & machining centers.
  • Excels in many industries including: medical, dental, aerospace, automobile, small pumps and motors, hydraulic fittings and coupling, job shops, machine tool accessories, firearms, heavy equipment and repair and wind power maintenance and repair


  • Uncoated tools featured below.
  • Minimum bore ranges: .025" - .490"
  • Maximum bore depth ranges: .050" - 3.500"
  • Radii: sharp cornered, .003" - .005"
  • Will not chip or break under normal machining conditions.
  • Tools manufactured with the exclusive Micro 100 proprietary process.
Product Specifications
Brand MICRO 100
Type Boring Bars
Minimum Bore .320"
Maximum Bore Depth 1.250"
Tool Material Solid Carbide
Cutting Direction Right Hand
Shank Diameter 3/8"
Finish Coating Bright
Series QBB
Model # QBB-3201250
Minimum Bore Diameter .320"
First Choice For: Steel
General Application Great opportunities with Swiss Type Screw Machines as well as small CNC lathes & machining centers
Maximum Bore 1-1/4"
Overall Length 2-1/2"
Projection .080"
Prop. 65 Yes
Tolerance_Maximum Bore Depth +.050"
Tolerance_Minimum Bore Diameter +/-.0005"
Tolerance_Shank Diameter -.0001"- .0002"
Type of Tool Boring Tool
Weight 0.1 lbs.
Workpiece Material Range Steel, Stainless Steel, High-Temp Exotic Alloys, Non-Ferrous, Cast Iron, Plastics
Prop 65 Warning Many metalworking products do contain metals that are included in the latest Prop 65 warning. Exposure to the elements can be harmful. May cause cancer and reproductive harm.

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