收藏: Sintered Diamond Core Drills

Our Sintered Diamond Core Drills are professional-grade metal-bonded diamond drilling tools engineered for precision, long-life core drilling in stone, glass, ceramic, gemstones, and hard minerals. Unlike electroplated bits with a single diamond layer, sintered core drills have diamonds distributed throughout the full depth of the metal matrix - as the cutting face wears, fresh diamonds are continuously exposed for consistent cutting performance from first use to last. Available in a complete size range from 3mm to 100mm, sold in convenient 2-piece sets.

Shop Sintered Diamond Core Drills - From $16.00 / 2-Piece Set

Available Sizes and Pricing

Full size range: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100mm

Sintered vs. Electroplated

Compatible Materials

• Natural stone - marble, granite, slate, sandstone, agate, jasper
• Glass - art glass, fused glass, plate glass, stained glass
• Ceramics - technical ceramics, porcelain tile, fired clay
• Gemstones - hard minerals, lapidary stones, rough specimens
• Engineered stone - quartz composite, terrazzo, concrete

Related Tools

• Water Swivel Adaptors - Continuous water feed through hollow drill shanks for maximum bit life
• Diamond Drill Bits - Electroplated solid tip and hollow core bits for lighter-duty drilling
• Diamond Wire Hollow Drill Bits - Fine hollow bits for 0.8mm-4mm precision holes
• Diamond Starrett Hole Saws - Large-diameter hole saws for oversized core drilling

Frequently Asked Questions

• Q: Why are sintered diamond core drills more expensive than standard diamond drill bits?
  A: Sintered drills have diamonds distributed throughout the full depth of the metal matrix, not just on the surface. As the cutting face wears, fresh diamonds are continuously exposed - giving sintered drills 5-20 times longer service life than electroplated bits. The higher initial cost is offset by dramatically lower replacement frequency, making sintered drills more economical for regular professional use.
• Q: Should sintered diamond core drills be used wet or dry?
  A: Always use wet. Water cooling is essential - it prevents the sintered matrix from overheating, flushes away stone dust and swarf, and maximizes drill life. Use a water swivel adaptor for continuous flow through the hollow shank, or drill in a shallow water puddle for smaller bits.
• Q: What drill speed should I use with sintered core drills?
  A: Use low to medium speed - 300-1,200 RPM depending on drill diameter. Larger diameter drills require lower speeds. Apply steady, moderate pressure without forcing. Sintered drills cut efficiently at controlled speeds - excessive speed and pressure generate heat and reduce drill life without improving drilling speed.
• Q: Why are the drills sold in 2-piece sets?
  A: Selling in 2-piece sets ensures you always have a backup drill on hand - essential for professional and production drilling where downtime for reordering is costly. Having a second drill also allows you to continue working while the first drill cools between holes in heat-sensitive materials.