Microbores

Microbores — New & Used

Microbores are precision boring tools used to achieve fine-diameter tolerances, smooth finishes, and accurate hole alignment in machining operations. Designed for high-precision CNC and manual milling machines, these tools offer micrometer-level adjustment for bores from sub-millimeter sizes up to several inches. Available in modular, fine-adjustable, and digital boring heads, microbores are essential for toolmaking, die work, and precision part production.

At Surplus Select, we stock a rotating inventory of new and used microboring tools and assemblies from trusted brands such as BIG Kaiser, Wohlhaupter, Criterion, Narex, and Sandvik Coromant. Our inventory updates daily with surplus pricing on complete boring heads, fine-adjust systems, and insert-compatible microboring bars for high-accuracy applications.

Price Match — We match any authorized distributor on identical in-stock parts, so you can source parts at surplus pricing with distributor-level assurance.

Trade-In Credit — Have quality new surplus items? Trade them in for store credit toward the parts you actually need.

Fast U.S. Shipping — Most orders ship same or next business day from our U.S. warehouse to keep your line running.

Find Your Microbore Fast (Search-First)

Search your part number (e.g., Kaiser EWN2-32, Wohlhaupter UPA3, Narex VHU36).
No PN? Try specs: “fine boring head 2-32mm” or “digital microboring tool”.
Need a specific OEM? Add the brand (e.g., BIG Kaiser boring head or Criterion microbore).

Applications & Use Cases

Precision machining: High-accuracy boring and finishing of holes in CNC or jig boring machines.
Tool & die manufacturing: Producing fine-tolerance bores for dies, molds, and fixtures.
Aerospace & automotive: Engine block, housing, and component finishing requiring precision bores.
General machining: Perfect for fine-tuning diameters after rough boring or drilling operations.
Maintenance & repair: Ideal for toolroom adjustments, rebuilds, and retrofit machining setups.

Why Buy Microbores from Surplus Select

New & Used Options: Precision boring heads, bars, and modular systems at surplus pricing.
Trusted Brands: BIG Kaiser, Wohlhaupter, Criterion, Narex, and Sandvik Coromant.
High-Accuracy Tools: Micrometer or digital adjustment heads for exacting tolerances.
Fast Shipping: Most orders ship same or next business day across the U.S.