This is a long, silver-colored drill bit with a wide, spiraling groove that twists up its shaft. The tip is thick and designed for drilling into hard materials like concrete, while the opposite end has a grooved shank to lock into a power drill.
A Bosch Spline SpeedX™ Rotary Hammer Bit, a long, durable metal drill bit designed for high-speed drilling in concrete, masonry, and reinforced materials. The bit features a precision-machined carbide tip with a four-cutter design for efficient drilling and reduced bit jamming. with a spiral flute design
tip
Bosch Concrete Tool Accessories | Bosch WOC 2026 promotional video
This is a long, silver-colored drill bit with a wide, spiraling groove that twists up its shaft. The tip is thick and designed for drilling into hard materials like concrete, while the opposite end has a grooved shank to lock into a power drill.
A Bosch Spline SpeedX™ Rotary Hammer Bit, a long, durable metal drill bit designed for high-speed drilling in concrete, masonry, and reinforced materials. The bit features a precision-machined carbide tip with a four-cutter design for efficient drilling and reduced bit jamming. with a spiral flute design
A Bosch Spline SpeedX™ Rotary Hammer Bit, a long, durable metal drill bit designed for high-speed drilling in concrete, masonry, and reinforced materials. The bit features a precision-machined carbide tip with a four-cutter design for efficient drilling and reduced bit jamming. with a spiral flute design
tip
This is a close-up, slightly angled shot of a single, long, silver-colored drill bit. The drill bit has a spiraled fluted body with a flatter, smooth shank and a multi-grooved end for a rotary hammer.
This is a close-up image of a metallic, threaded shaft, similar to a bolt or a drill bit. Its surface features distinct, continuous spiral grooves running along its length, creating a textured, ridged appearance.
This is a close-up, eye-level shot of a long, silver-colored drill bit. The drill bit has a helical flute design, tapering slightly from a wider cutting head at the top to a narrower shank at the bottom, and appears to be made of metal.
This is a image of a long, metallic gray drill bit or auger, designed for heavy-duty drilling. It features a continuous, prominent spiral flute running along most of its length, ending in a fluted, cylindrical shank on the right and a slightly wider, blunted tip on the far left.
Bosch Spline SpeedX rotary hammer drill bit showcasing a side profile layout with its industrial ridge spline drive shank, extended deep dual flute geometry for faster dust removal, and a patented four cutter solid tungsten carbide head engineered for heavy duty reinforced concrete and masonry stone penetration isolated horizontally on a white background.
Bosch Spline SpeedX rotary hammer drill bit showing a full vertical view of its heavy duty silver alloy steel body featuring an industrial spline shank connection base, an elongated spiral flute shaft designed for faster dust removal, and a carbide tipped cutter head engineered for high performance penetration through reinforced concrete, masonry brick, and natural stone substrates isolated on a white background.
Bosch Spline SpeedX rotary hammer drill bit showing a heavy-duty silver steel alloy body with an industrial slotted spline shank connection base, an elongated spiral flute shaft engineered for faster dust removal, and a carbide-tipped cutter head designed for high-performance penetration through reinforced concrete, masonry brick, and natural stone substrates isolated on a white background.
Bosch Spline SpeedX rotary hammer drill bit showing a full vertical layout of its heavy duty silver steel alloy body featuring an industrial spline shank drive connection base, an elongated spiral flute shaft designed for faster dust removal, and a multi cutter carbide tipped head engineered for high performance penetration through reinforced concrete, masonry brick, and natural stone substrates isolated on a white background.
Bosch Spline SpeedX rotary hammer drill bit showing a full vertical layout of its heavy duty silver steel alloy body featuring an industrial ridge slotted spline drive shank connection base, an elongated spiral flute shaft designed for faster dust removal, and a multi cutter carbide tipped head engineered for high performance penetration through reinforced concrete, masonry brick, and natural stone substrates isolated on a white background.
An ultra-long Bosch Spline SpeedX rotary hammer drill bit oriented vertically on a seamless white background, showcasing its elongated heavy-duty steel core shaft featuring an optimized spiral fluting design engineered for faster dust removal, a specialized quick-change spline drive shank configuration at the base, and an aggressive solid carbide tipped head built for precision high-speed boring and structural penetration through reinforced concrete, masonry block, brick, and dense stone aggregates.
A heavy-duty Bosch Spline SpeedX rotary hammer drill bit positioned vertically against a plain white background, showcasing its industrial-grade splined drive shank designed for high-impact demolition tools, a solid steel extension shaft, an optimized four-flute deep spiral winding core engineered for rapid masonry dust extraction, and a robust carbide-tipped cutting tip optimized for high-speed penetration through reinforced concrete, rebar, brick, and stone.
A heavy-duty Bosch Spline SpeedX rotary hammer drill bit oriented vertically against a solid white background, showcasing its standard industrial splined connection shank built for robust demolition hammers, a solid solid-steel mid-shaft, an optimized four-flute deep spiral winding core engineered for accelerated dust removal, and a premium full carbide-tipped cutting tip optimized for high-speed structural penetration through reinforced concrete, rebar, brick, and stone.
Bosch Concrete Tool Accessories | Bosch WOC 2026 promotional video
BOSCH

Bosch Rotary Hammer Bits Spline SpeedX 4 Cutter Heads (Active Centering Point Inclined Carbide Teeth Diffusion Bonded Rebar Concrete Stone Boring)

In stock
SKU: HC4501
$28.65 USD

Size (Diameter x Length) Inches
Description

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Bosch Spline SpeedX™ 4-Cutter Carbide Rotary Hammer Drill Bits

The Bosch Spline SpeedX™ rotary hammer drill bits bore heavy-duty structural anchoring, rebar doweling, and mechanical utility penetrations across rebar-reinforced concrete, hard aggregate, natural stone, and commercial masonry block. Engineered with a patented 4-cutter head architecture and high-hardness diffusion bonding, these industrial-grade bits slice through embedded steel rebar without binding or shattering like traditional two-cutter bits. Outfitted with an active-centering guide point for immediate non-walking hole starts, inclined tungsten carbide side cutters that shear coarse aggregate quickly, and high-volume evacuation flutes that pull abrasive masonry dust away from the tip, they equip commercial MEP contractors, structural concrete specialists, and masonry crews with rapid, low-vibration drilling throughput in spline-drive rotary hammers.

Best Used For:

  • Reinforced Concrete Doweling and Anchoring: Drilling structural rebar dowel holes and high-strength mechanical anchor pathways through foundation footings and bridge piers containing embedded steel rebar.
  • Natural Stone and Hard Aggregate Boring: Penetrating dense granite aggregates, quartzite concrete, hard clay brick, and limestone facades with sustained cutting velocity.
  • Commercial MEP Pipe and Conduit Passages: Boring clean, circular through-holes in commercial CMU cinder block walls and floor slabs for plumbing lines and electrical conduit runs.

Key Performance & Safety Features

  • Patented 4-Cutter Head Geometry: Multi-cutter head configuration distributes cutting force evenly to prevent seizing and head fracture during severe rebar strikes.
  • Active-Centering Guide Point: Conical starter tip bites immediately into smooth concrete surfaces to establish precise hole layout without walking.
  • High-Hardness Diffusion Bonding: Molecular-level joining technology fuses the custom-forged tungsten carbide tip permanently to the alloy steel body for extreme impact resilience.
  • Inclined Side Cutters: Angled secondary carbide cutting edges aggressively shear aggregate blockages to maintain fast penetration rates in hard materials.
  • Large-Volume Dust Flutes: High-capacity extraction channels rapidly transport pulverized concrete powder and stone debris away from the cutting tip to prevent heat buildup and hole packing.
  • Industrial Spline Shank Interface: Precision-milled spline drive provides positive mechanical lockup and zero-slip rotational torque transmission inside heavy-duty spline power tools.

What's Included

  • (1) Bosch Spline SpeedX™ Heavy-Duty Rotary Hammer Drill Bit in User-Selected Model & Size:
    • HC4501: 3/8" Diameter x 10" Overall Length (5" Usable Length)
    • HC4511: 1/2" Diameter x 11" Overall Length (6" Usable Length)
    • HC4512: 1/2" Diameter x 16" Overall Length (11" Usable Length)
    • HC4513: 1/2" Diameter x 23" Overall Length (18" Usable Length)
    • HC4516: 1/2" Diameter x 36" Overall Length (31" Usable Length)
    • HC4021: 5/8" Diameter x 16" Overall Length (11" Usable Length)
    • HC4022: 5/8" Diameter x 21" Overall Length (16" Usable Length)
    • HC4023: 5/8" Diameter x 36" Overall Length (31" Usable Length)
    • HC4032: 3/4" Diameter x 16" Overall Length (11" Usable Length)
    • HC4033: 3/4" Diameter x 21" Overall Length (16" Usable Length)
    • HC4034: 3/4" Diameter x 36" Overall Length (31" Usable Length)
    • HC4040: 7/8" Diameter x 16" Overall Length (11" Usable Length)
    • HC4041: 7/8" Diameter x 21" Overall Length (16" Usable Length)
    • HC4042: 7/8" Diameter x 36" Overall Length (31" Usable Length)
    • HC4050: 1" Diameter x 16" Overall Length (11" Usable Length)
    • HC4051: 1" Diameter x 21" Overall Length (16" Usable Length)
    • HC4053: 1" Diameter x 36" Overall Length (31" Usable Length)
    • HC4060: 1-1/8" Diameter x 16" Overall Length (11" Usable Length)
    • HC4061: 1-1/8" Diameter x 21" Overall Length (16" Usable Length)
    • HC4062: 1-1/8" Diameter x 36" Overall Length (31" Usable Length)
    • HC4063: 1-1/4" Diameter x 15" Overall Length (10" Usable Length)
    • HC4070: 1-1/4" Diameter x 21" Overall Length (16" Usable Length)
    • HC4071: 1-1/4" Diameter x 36" Overall Length (31" Usable Length)
    • HC4073: 1-3/8" Diameter x 23" Overall Length (18" Usable Length)
    • HC4081: 1-1/2" Diameter x 23" Overall Length (18" Usable Length)
    • HC4091: 1-3/4" Diameter x 23" Overall Length (18" Usable Length)
    • HC4093: 2" Diameter x 23" Overall Length (18" Usable Length)

Technical Specifications

Manufacturer Brand Bosch Power Tools
Product Series Class Spline SpeedX™ Rotary Hammer Bit Series
Selectable Model Numbers HC4501 to HC4516 Series & HC4021 to HC4093 Series
Available Hole Diameters 0.375 in. to 2.000 in. (3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-3/4", 2")
Overall Bit Length Range 10.000 in. to 36.000 in. (10", 11", 15", 16", 21", 23", 36")
Tool Drive Shank Style Industrial Spline Drive Interface Standard
Cutting Tip Metallurgy Custom-Forged Industrial Tungsten Carbide Matrix
Cutter Head Architecture Patented 4-Cutter Geometry with Inclined Side Cutters
Core Bonding Technology High-Hardness Molecular Diffusion-Bonding System
Centering System Profile Integrated Active-Centering Point Geometry
Flute Debris Geometry Large-Volume High-Capacity Deep Dust Extraction Channels
Operational Drill Mode Rotary Hammer Mode Only (Hammer + Rotation)
Power Tool Compatibility Corded & Cordless Spline Drive Rotary Hammer Drills
Suitable for material type Rebar-Reinforced Concrete, Stone, Brick, & Cinder Block

Pro-Tip: Always lubricate the spline drive shank splines with high-pressure grease prior to locking the bit into the tool chuck; keeping spline teeth coated prevents frictional heat buildup and eliminates premature wear on both the bit shank and the hammer's drive sleeve.