Diamond Magnetic Disks

Diamond Magnetic Flat Lap Discs – Instant Quick-Change Diamond Discs for Flat Lap Machines

Professional diamond flat lap discs with magnetic backing for instant quick-change attachment on magnetic flat lap machines (Genie, Titan, and compatible systems). Magnetic backing eliminates adhesive mounting — attach and remove discs in seconds for fast grit progression during multi-stage lapidary grinding sequences. Available in 8" to 18" diameters across grit 45 to 3000, with PSA and plain backing options also available on most sizes.

🔥 Shop Diamond Magnetic Discs – From $15.50

Available Sizes & Pricing

Diameter Grit Range Magnetic PSA Plain
8" (half disc) 60–320 $15.50 $13.00 $12.00
8" (full face) 60–320 $28.00 $23.00 $22.00
10" 45–600 + 1200 + 3000 $45.00 $40.00 $40.00
12" 45–600 $70.00 $70.00 $70.00
14" 45–600 $105.00 $105.00 $105.00
16" 45–600 $145.00 $145.00 $145.00
18"-24” 45–600 $160.00 $160.00 $160.00

Grit Selection Guide

Grit Stage Application
45–80 Coarse grinding Rapid stock removal, rough shaping of cabochon preforms from slab
100–140 Medium grinding Shape refinement, removing coarse grinding scratches
200–270 Fine grinding Surface smoothing, preparing for pre-polish stage
325–600 Pre-polish Scratch removal, surface preparation for polishing pads
1200–3000 Fine pre-polish Near-polish surface quality before final polishing pad stage

Compatible Machines

  • Genie flat lap machines (all models with magnetic quick-change system)
  • Titan flat lap machines with magnetic backing plate
  • Any flat lap machine equipped with a magnetic quick-change backing plate
  • Also available with PSA and plain backing for non-magnetic machines

Related Tools

Frequently Asked Questions

  • Q: What flat lap machines are compatible with magnetic diamond discs?
    A: Magnetic diamond discs are compatible with any flat lap machine equipped with a magnetic quick-change backing plate, including Genie and Titan flat lap machines. If your machine does not have a magnetic system, you can add compatibility by installing a magnetic backing plate — available in our Magnetic Backed Plates collection. Alternatively, choose PSA or plain backing versions for non-magnetic machines.
  • Q: What is the advantage of magnetic backing over PSA sticker backing?
    A: Magnetic backing allows instant disc attachment and removal without adhesive — swap grits in seconds during multi-stage grinding sequences. PSA sticker backing provides a permanent bond for each session but requires peeling and reapplying for each grit change. For high-volume lapidary work with frequent grit changes, magnetic backing significantly reduces downtime between stages.
  • Q: What grit magnetic disc should I start with for cabochon grinding?
    A: Start with 60–80 grit for rapid stock removal and rough shaping. Progress to 100–140 grit for shape refinement, then 200–270 grit for surface smoothing, and finish with 325–600 grit to prepare the surface for polishing pads. For a finer pre-polish surface, continue with 1200 or 3000 grit (available in 10" size) before switching to felt or leather polishing pads.
  • Q: Can I use magnetic diamond discs on a non-magnetic flat lap machine?
    A: Yes — most sizes are also available with PSA sticker or plain (no backing) options for non-magnetic machines. Alternatively, install a magnetic backing plate on your existing machine to enable magnetic quick-change disc compatibility. Check the Magnetic Backed Plates collection for compatible plate sizes.
  • Q: What is the difference between half-disc and full-face 8" magnetic discs?
    A: Full-face 8" discs cover the entire lap surface for maximum grinding area and even wear distribution. Half-disc (8"x1/2") versions cover half the lap surface, allowing two different grits to be mounted simultaneously on a single lap for faster grit progression without changing discs — a popular setup for high-volume cabochon grinding workflows.