Bosch Stop Drill Bits SDS Plus Depth Collar Cutters (Carbide Tip Spiral Flute Drop In Sleeve Anchor Concrete Masonry Fastener Boring)

Bosch SDS-plus® Carbide-Tipped Rotary Hammer Depth Stop Bits

The Bosch SDS-plus® rotary hammer depth stop bits bore high-precision shallow anchor holes across poured concrete slabs, precast hollow core planks, and structural masonry walls with zero risk of over-penetration. Engineered with an integrated solid steel depth stop collar positioned at fixed drilling depths, these specialized masonry accessories guarantee exact anchor seating depth for drop-in fasteners, wedge anchors, and sleeve anchors without requiring tape markings or manual depth rod adjustments. Outfitted with Bosch-manufactured wear-resistant tungsten carbide cutting tips, high-velocity spiral dust extraction flutes that pull abrasive pulverized debris rapidly away from the hole face, and a universal SDS-plus® slotted drive shank, they equip commercial mechanical contractors, electrical installers, and structural steel erectors with consistent, code-compliant fastener setting productivity.

Best Used For:

• Drop-In Anchor and Threaded Rod Suspensions: Drilling exact-depth overhead anchor holes in concrete ceilings for 3/8-inch and 1/2-inch drop-in anchors supporting HVAC ductwork, cable trays, and plumbing pipe hangers.
• Post-Tension Slab and Shallow Concrete Fastening: Boring controlled-depth anchor holes in tensioned concrete floors and thin precast panels without risking contact with underlying post-tension cables or conduit.
• Commercial Electrical and Machinery Base Mounting: Installing shallow sleeve and wedge anchors into solid concrete and CMU block for mounting transformer pads, control panels, and conduit strut channels.

Key Performance & Safety Features

• Integrated Solid Steel Depth Collar: Positive mechanical stop prevents over-drilling to ensure repeatable, code-compliant anchor embedment depth on every hole.
• Bosch Tungsten Carbide Tip: Premium industrial-grade sintered carbide cutting head delivers exceptional wear resistance and durability in dense concrete aggregate.
• High-Efficiency Spiral Flutes: Engineered dust extraction channels pull concrete powder away from the cutting zone rapidly to lower bit temperatures and prevent packing.
• Universal SDS-plus® Interface: Fits all commercial SDS-plus® rotary hammers, providing fast, keyless bit changes and positive torque transmission.
• Prevents Post-Tension Cable Strikes: Fixed shallow drilling depth minimizes risk of penetrating structural post-tension tendons and buried conduits in concrete floors.
• Heavy-Duty High-Temperature Brazing: Robust head joint bonding withstands continuous rotary percussion shock without carbide detachment.

What's Included

• (1) Bosch SDS-plus® Carbide-Tipped Stop Bit in User-Selected Size & Model:
  • HCSTP2061: 3/8" Diameter x 1-1/16" Drilling Depth Stop Bit
  • HCSTP2081: 1/2" Diameter x 13/16" Drilling Depth Stop Bit
  • HCSTP2083: 1/2" Diameter x 1-11/16" Drilling Depth Stop Bit
  • HCSTP2084: 5/8" Diameter x 1-3/16" Drilling Depth Stop Bit
  • HCSTP2086: 5/8" Diameter x 2-1/16" Drilling Depth Stop Bit

Technical Specifications

Pro-Tip: Allow the integrated steel stop collar to sit flat against the concrete surface before withdrawing the bit; clearing dust with a squeeze bulb or vacuum ensures your drop-in anchor drops flush with the surface for maximum expansion anchor pull-out resistance.