left hand drill bits Manufacturer

Left hand drill bits are specialized tools designed to remove broken bolts, screws, and studs. They feature a reverse spiral flute, which allows them to grip and unwind the fastener as you drill. This guide explores the uses, types, selection criteria, and maintenance of left hand drill bits, helping you choose the right tool for your needs.

Understanding Left Hand Drill Bits

Left hand drill bits, sometimes referred to as reverse drill bits, are essential for extracting damaged fasteners. Unlike standard drill bits that rotate clockwise, these bits rotate counter-clockwise. This reverse rotation is key to their functionality.

How They Work

When a left hand drill bit is used on a broken fastener, the counter-clockwise rotation can often catch on the edges of the damaged screw or bolt. This creates torque in the opposite direction of tightening, which can, in many cases, be enough to loosen and remove the fastener without the need for an extractor.

Why Use Left Hand Drill Bits?

• Fastener Extraction: Primary use is to remove broken bolts, screws, and studs.
• Time Saving: Can often remove the fastener directly without additional tools.
• Damage Reduction: Minimizes further damage to the surrounding material.

Types of Left Hand Drill Bits

Left hand drill bits come in various materials and coatings, each suited to different applications.

Material Types

• High-Speed Steel (HSS): General-purpose, suitable for drilling into wood, plastic, and soft metals.
• Cobalt: Offers higher heat resistance and is ideal for drilling into tougher metals like stainless steel.
• Titanium Nitride (TiN) Coated: Increases surface hardness and lubricity for extended tool life and faster drilling.

Size and Sets

Left hand drill bits are available individually and in sets. Sets often include a range of sizes to accommodate different fastener sizes. Consider purchasing a set to ensure you have the right size on hand.

Selecting the Right Left Hand Drill Bit

Choosing the correct left hand drill bit is crucial for effective and safe fastener removal.

Material Compatibility

Select a drill bit material appropriate for the material of the broken fastener. Cobalt bits are recommended for hardened steel fasteners, while HSS bits are sufficient for softer materials.

Size Selection

Choose a drill bit slightly smaller than the diameter of the broken fastener. Starting with a smaller pilot hole can help center the bit and prevent it from wandering. Refer to fastener size charts to determine the correct drill bit size. Wayleading Tools provides comprehensive sizing guides on our website, www.wayleading.com, to assist you in selecting the optimal bit for your needs.

Quality and Brand

Invest in high-quality left hand drill bits from reputable manufacturers. Higher quality bits are less likely to break or dull quickly, leading to better performance and longer tool life.

Using Left Hand Drill Bits: A Step-by-Step Guide

Follow these steps for successful fastener extraction with left hand drill bits.

1. Preparation: Clean the area around the broken fastener and center punch the fastener to create a starting point.
2. Pilot Hole (Optional): Drill a small pilot hole using a standard drill bit. This can help guide the left hand drill bit.
3. Drilling: Insert the left hand drill bit into the drill chuck and tighten securely. Set the drill to a slow speed and apply steady pressure.
4. Extraction: As the bit drills, it should grip the fastener and begin to unwind it. If the bit spins freely, try a slightly larger size.
5. Removal: Once the fastener is loose, remove it completely.

Safety Precautions

Always prioritize safety when using left hand drill bits.

• Wear Safety Glasses: Protect your eyes from flying debris.
• Use Gloves: Protect your hands from sharp edges and hot metal.
• Control Speed: Avoid excessive drill speed, which can cause the bit to break.
• Apply Steady Pressure: Avoid excessive force, which can also cause the bit to break or damage the surrounding material.

Maintenance and Storage

Proper maintenance and storage will extend the life of your left hand drill bits.

Cleaning

Clean the bits after each use to remove debris and prevent corrosion. Use a wire brush and light oil to keep them in good condition.

Sharpening

Sharpen dull bits to maintain their cutting efficiency. Use a drill bit sharpener or consult a professional for sharpening services.

Storage

Store the bits in a dry, organized location to prevent damage and corrosion. Use a drill bit index or case to keep them separated and easily accessible.

Troubleshooting Common Issues

Here are some common issues and solutions when using left hand drill bits:

• Bit Slipping: Ensure the drill chuck is tightened securely. Use a center punch to create a better starting point.
• Bit Breaking: Reduce drill speed and apply steady pressure. Use a bit designed for the material you are drilling.
• Fastener Not Loosening: Try a slightly larger bit. Ensure the bit is properly aligned with the fastener.

Comparing Left Hand Drill Bit Sets

Choosing the right set can be overwhelming. Here's a comparison of features to consider:

Conclusion

Left hand drill bits are indispensable tools for anyone dealing with broken fasteners. By understanding their uses, types, and proper techniques, you can efficiently and safely remove damaged screws and bolts. Choose the right bit for the job, follow safety precautions, and maintain your tools for optimal performance. For a comprehensive selection of high-quality left hand drill bits, visit Wayleading Tools at www.wayleading.com. We offer a variety of sizes and materials to meet your specific needs.