KEYSTONE 73-C Inverted Cone Spiral Cut 3/32 Shank

3/32 Shank HP · Carbide Cutters

Manufacturer item # 1201870  ·  USDD item # 034-1201870  ·  Variant Carbide Cutters

Shank3/32" HP (Handpiece) — lab bench use

MaterialTungsten Carbide

Cut actionCuts (does not polish)

Use environmentLaboratory — straight HP handpiece

SterilizationAutoclavable (Carbide tools)

OverviewWhy You'll Love ItSpecsHow to UseCompareOrder

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Overview

KEYSTONE 3/32" HP-shank tungsten Carbide Burs are the workhorse cutting tools of the dental Laboratory bench. The 3/32" (2.35 mm) shank is the universal standard for lab straight handpieces and bench-mount handpieces used to trim, shape, and reduce denture acrylic, base metals, gold and silver alloys, and chrome-cobalt partial frameworks. Tungsten Carbide cuts cleanly and predictably through these materials at the working speeds typical of lab handpieces, with significantly longer tool life than high-speed steel.

HP-shank means handpiece — these are lab Burs intended for the bench, not for direct intraoral chair-side reduction. (Chair-side intraoral high-speed reduction uses FG friction-grip Burs; chair-side slow-speed uses RA latch Burs. HP Burs belong on the lab side of the operatory wall.)

• Universal 3/32" (2.35 mm) HP shank. Fits every lab straight handpiece and bench-mount handpiece on the market.
• Tungsten Carbide cutting edges. Six to twelve times the tool life of high-speed steel; cuts cleanly under continuous load.
• Wide head-shape selection. Round, Cone, cylinder, flame, taper, pear and bud shapes for every lab geometry — trimming, contouring, hollow-grinding.
• Plain-cut, cross-cut, and diamond-cut flute geometries. Plain cut for smooth finish; cross-cut and diamond-cut for fast bulk reduction.
• Autoclavable. Withstands standard steam-autoclave sterilization cycles, so the same bur can be used across multiple cases.

Technical specifications

Material & regulatory

KEYSTONE HP-shank tungsten Carbide Burs are Laboratory tools intended for use by dental technicians on bench-mount and straight handpieces. They are not classified as intra-oral medical devices and are not intended for direct chair-side reduction of natural tooth structure. Manufactured by KEYSTONE Industries.

How to use

Recommended use. Mount the bur fully into the lab straight handpiece chuck (3/32" / 2.35 mm collet). Operate at the speed recommended for the material being cut — typically 10,000–25,000 RPM for acrylic, slower for chrome-cobalt and gold. Use light pressure; Carbide cuts on its own and does not benefit from heavy hand-loading.

Caution. Tungsten Carbide is a hard, brittle material — Burs are designed to cut, not pry. Side-loading or prying with a Carbide bur can fracture the cutting edges or snap the shank. Discard Burs with chipped or rounded edges.

What Carbide should NOT be used on: glass-ceramic restorations (e.g. lithium disilicate, zirconia, feldspathic porcelain) — use diamond Burs for those. Carbide is also not appropriate for finishing natural enamel or dentine intraorally — chair-side enamel work is done with FG diamonds or FG Carbide finishing Burs on a high-speed handpiece, not HP shank.

Compare with cross-brand alternatives

Looking for alternatives? Here are equivalent products from other manufacturers carried by USDD, serving the same clinical or Laboratory purpose. The KEYSTONE Industries 3/32 Shank HP row is highlighted at the top.

Order this 3/32" HP Carbide bur

Available now from US Dental Depot. Request a custom quote for volume orders or speak with a product specialist for compatibility questions and clinical guidance.