Durable Tungsten Carbide Thread Drill Bits - Factory Direct Wholesale Prices

it come down to how well the steel holds up against impact and abrasion in hard rock, and we've dialed in the to balance those two property—vacuum degassing removes internal voids that cause fracture under load, while normalizing refines teh grain structure for consistent hardness across the bit.

Most buyers go with the 51mm diameter for blast hole drilling in granite or quartzite, but we actually see more runs on the 43mm bits for smaller quarrying operations where you're not swinging a jumbo. And the carbide tips are brazed in under controlled atmosphere to avoid oxidation at the joint, which is usually the failure point on cheaper tooling.

You'll get HRC 58-62 on the body, but the tungsten carbide tips themselves hit around HRC 88-90 (not that we spec that, but it's what you'd expect from a standerd grade). anti-corrosion coating is basically a phosphate dip—it holds up fine in wet ground but doesn't add to the wear life.

4.685kg per piece is the standard for the 48mm retrac body, so if you order the 43mm normal type, expect it to come in about 0.5kg lighter (check lead time on that variant, we usually have stock but confirm before committing). Packaging is plastic boxes of 4 to 6 bits each—nobody's dumping these loose in a bin.

What it does well is hold thread engagement under heavy feed presure in crushed rock, but it's not suited for highly abrasive sandstone without frequent tip dressing. Also, we've found the 6-month materail defects, not wear—that's pretty much standard across the industry for bits that see continuous use in muck.

200 pieces or so is the MOQ for custom OEM threads, but we'll break that down if you're ordering standard AISI dimensoins off the shelf. The HS code is 82071990 if you're importing directly, and we'll provide the COA from the forging lot number on request.