Diamond Flat Lap Discs

Diamond Flat Lap Discs – 6" & 8" Electroplated Diamond Discs for Flat Lap Machines

Our Diamond Flat Lap Discs are precision electroplated diamond grinding and polishing discs for flat lap machines and faceting units. Available in 6" and 8" diameters with a full grit range from 60 through 3000, and in four backing options — Magnetic, PSA Sticker, Master Lap, and No Backing — to suit every flat lap machine setup. Engineered for consistent, accurate stock removal on gemstones, glass, and metals, these discs deliver reliable performance for both professional lapidary artists and dedicated hobbyists.

🔥 Shop Diamond Flat Lap Discs

Available Sizes & Grits

Diameter Thickness Available Grits
6" 1/2" 60, 80, 120, 180, 260, 360, 600, 800, 1000, 1200, 1500, 2000, 3000
8" 1/2" 60, 80, 100, 180, 260, 360, 600, 800, 1000, 1200, 1500, 2000, 3000

Backing Options

Backing Type How It Works Best For
Magnetic Backing Snaps instantly onto magnetic master lap plates Quick grit changes, multi-stage grinding workflows
PSA Sticker Pressure-sensitive adhesive bonds to backing plates Standard flat lap machines with PSA backing plates
Master Lap Includes master lap backing plate assembly Complete setup — disc and backing plate together
None No backing — disc only Custom mounting, replacement discs for existing setups

Grit Selection Guide

Grit Stage Application
60–100 Coarse grinding Rapid material removal, initial shaping on rough stone
180–360 Medium grinding Surface smoothing, facet refinement, scratch removal
600–1200 Fine grinding Pre-polish surface preparation, fine scratch removal
1500–3000 Ultra-fine / pre-polish Final smoothing before polishing lap or compound stages

Compatible Applications

  • Gemstone cabochon flat grinding — consistent diamond contact across the full disc face for even stock removal
  • Faceting machine grinding — 6" and 8" discs for standard faceting machine platens
  • Glass surface grinding — flat lap grinding of art glass, fused glass, and optical glass
  • Stone slab face grinding — leveling and surface preparation on lapidary stone slabs
  • Metal surface grinding — tool steel, carbide, and non-ferrous metal surface preparation
  • Magnetic quick-change systems — magnetic-backed discs for tool-free grit changes on magnetic master laps

Related Tools

Frequently Asked Questions

  • Q: What is the difference between Magnetic Backing and PSA Sticker options?
    A: Magnetic Backing discs snap instantly onto a magnetic master lap plate — ideal for fast grit changes between grinding stages with no adhesive needed. PSA Sticker discs use a pressure-sensitive adhesive that bonds firmly to a standard backing plate — a more economical option for setups where quick disc changes are not required.
  • Q: Which grit should I start with for flat lap cabochon grinding?
    A: Start with 60–100 grit for rough shaping and rapid material removal. Progress through 180–360 grit for smoothing, 600–1200 grit for fine pre-polish preparation, and finish with 1500–3000 grit before moving to a polishing lap or compound.
  • Q: Should diamond flat lap discs be used wet or dry?
    A: Wet use is strongly recommended. Keep water flowing over the disc during grinding to cool the diamond surface, prevent glazing, extend disc life, and suppress stone dust.