The Damaged Screw Extractor & Broken Bolt Remover 6-Piece Set (High-Speed Steel HSS 4341) is a specialized mechanical repair and extraction tool kit engineered to quickly remove stripped, sheared, rounded-off, rusted, painted, or seized screws and bolts without damaging surrounding workpieces. Manufactured from premium heat-treated High-Speed Steel (HSS 4341) with a high Rockwell hardness rating (63–65 HRC), each double-ended bit integrates a high-speed burnishing/drilling tip on one end and a reverse-threaded tapered extractor flute on the other. Fitted with a standard 1/4-inch quick-change hex shank, this comprehensive 6-piece kit covers fasteners ranging from micro screws (approx. 2 mm / 0) up to heavy-duty bolts (approx. 12 mm / 4), making it indispensable for electronics repair, robotics fabrication, CNC machinery maintenance, automotive repairs, and woodworking workshops.

Specifications

• Product Type: Dual-End Damaged Screw and Bolt Extractor Bit Set
• Piece Count: 6-Piece Set (Sizes 0, 1, 2, 2, 3, 4)
• Material: Premium Grade High-Speed Steel (HSS 4341 / Hardened Alloy Steel)
• Surface Treatment / Coating: Polished Titanium Nitride (Gold) or Industrial Bright Silver / Black Oxide Finish
• Hardness Rating: 63 HRC to 65 HRC
• Shank Type: Standard 1/4-inch (6.35 mm) Quick-Release Hex Shank
• Drill & Extraction Direction: Reverse / Counter-Clockwise (Left-Hand Operation)
• Bit Sizing & Fastener Compatibility Breakdown:
  • Bit 0: Removes screws/bolts 2 mm to 3 mm (Approx. 1/16" to 1/8")
  • Bit 1: Removes screws/bolts 3 mm to 5 mm (Approx. 1/8" to 3/16")
  • Bit 2 (Qty: 2): Removes screws/bolts 4 mm to 8 mm (Approx. 5/32" to 5/16" - Most common standard size)
  • Bit 3: Removes screws/bolts 5 mm to 10 mm (Approx. 3/16" to 3/8")
  • Bit 4: Removes screws/bolts 6 mm to 12 mm (Approx. 1/4" to 1/2")
• Compatible Screw Types: Phillips, Slotted, Hex Socket (Allen), Torx, Pozidriv, Square, and Rounded/Sheared Hex Head Bolts
• Overall Bit Length: Approx. 51 mm (2.0 inches) per bit
• Storage Case: Compact heavy-duty ABS plastic storage box with secure snap lock
• Total Set Weight: Approx. 110 g (including storage case)

Features

• Dual-Ended 2-in-1 Design: Each bit features a burnishing/drilling point on one end to create a clean conical pilot hole, and a reverse-threaded spiral extractor on the opposite end for positive mechanical grip.
• High-Grade Hardened HSS 4341: Offers high wear resistance and torsional shear strength, allowing extraction of hardened steel, stainless steel, brass, and aluminum fasteners without breaking the extractor tip.
• Universal 1/4" Hex Shank: Fully compatible with all standard drill chucks, cordless screwdrivers, quick-change magnetic bit holders, and manual hex drivers.
• Reverse Left-Handed Action: Both drilling and extraction operations run in reverse (counter-clockwise), ensuring that drilling vibration occasionally loosens the stuck screw even before full extraction is engaged.
• Aggressive Tapered Reverse Flutes: Reverse spiral threads dig deeper into the drilled pilot hole as torque is applied, maximizing gripping force without slipping.

Common Applications

• Robotics & 3D Printers: Removing stripped M2, M3, and M4 hex socket cap screws from aluminum extrusions, motor mounts, and linear rail blocks.
• Electronics & PCB Enclosures: Extracting corroded or cross-threaded chassis screws from power supply housings, audio racks, and test instruments.
• Automotive & Motorcycle Maintenance: Removing seized engine cover bolts, rusted bracket fasteners, and stripped interior trim screws.
• Industrial Machinery & CNC Equipment: Extracting sheared studs and broken bolts from motor faceplates, pulleys, and structural frames.
• Woodworking & DIY Workshop: Backing out stripped drywall screws, rounded wood screws, and sheared brass cabinet fasteners.

Usage Tips

• Step 1 – Burnishing (Drilling Pilot Hole):
  • Select an extractor size slightly smaller than the damaged screw head.
  • Insert the bit with the drill tip facing out into your variable-speed drill chuck.
  • Set your drill rotation strictly to REVERSE (Counter-Clockwise) and run at a LOW, controlled speed.
  • Apply firm downward pressure to drill a smooth, conical depression into the center of the stripped screw head (depth approx. 2 mm to 3 mm).
• Step 2 – Extraction (Removal):
  • Flip the bit so the threaded extractor end faces out and clamp it back into the drill chuck.
  • Keep the drill setting strictly on REVERSE (Counter-Clockwise) and use the SLOWEST possible RPM.
  • Apply firm vertical downward pressure while gently pulling the drill trigger; the reverse threads will bite into the pilot hole and smoothly back the stripped screw out.
• Never Use Hammer Mode: Always use standard drill mode. Do not use impact drivers or hammer drill settings, as sudden percussive shocks can fracture high-hardness HSS extractor bits.
• Cutting Fluid for Hardened Bolts: When extracting stainless steel or hardened grade 8.8+ bolts, apply a drop of cutting fluid or machine oil to the drilling point to prevent overheating and maintain cutting edge sharpness.
• Seized/Rusted Screws: For heavily rusted or seized fasteners, apply penetrating oil (e.g., WD-40 or equivalent) 5 to 10 minutes prior to extraction to reduce frictional breakout torque.