What drill bit should be used for galvanized cable trays

Cobalt, titanium nitride-coated, and carbide drill bits are the best choices for drilling galvanized cable trays due to their hardness, heat resistance, and durability.

Best Drill Bit Materials

Cobalt Drill Bits: Made from M35 high-speed steel with 5–8% cobalt, these bits are extremely hard and heat-resistant, making them ideal for drilling through galvanized steel without dulling quickly or breaking. They are particularly effective for thicker cable trays and repeated use. Titanium Nitride (TiN) Coated Bits: These bits have a titanium nitride coating that reduces friction, prevents sticking, and extends the bit's lifespan up to six times longer than standard bits.

They are suitable for medium-thickness galvanized steel and provide smooth, precise holes.

Carbide-

Tipped Bits: Extremely hard and wear-resistant, carbide-tipped bits are best for very thick or industrial-grade galvanized steel. They can handle high-speed drilling and maintain sharpness over prolonged use.

High-

Speed Steel (HSS) Bits: Suitable for thinner galvanized steel, HSS bits are more affordable but less durable than cobalt or carbide options. They are best for light-duty or occasional drilling. Recommended Drill Bit SetsDEWALT Titanium Nitride Coated Drill Bit Set (21-Piece): Includes popular SAE sizes, stubby design for tight spaces, and 135° split point tips for faster, accurate drilling.

MACXCOI

P Cobalt Drill Bit Set (13-Piece): M35 cobalt steel, 135° point tip, polished for precision, ideal for hard metals.

COMOWAR

E 15-Piece Drill Bit Set (1/16″–3/8″): Versatile sizes for various projects, durable and heat-resistant.

Nord

Wolf 5-Piece M35 Cobalt Stubby Drill Bit Set: Compact, durable, and compatible with impact drivers, perfect for stainless steel and galvanized steel.

Drilling Tips for Galvanized Cable Trays

Mark and Secure: Use a center punch to mark drilling points and clamp the tray securely to prevent movement. Use Lubrication: Apply cutting oil or water to reduce heat and friction, preserving the zinc coating and extending bit life. Correct Speed and Pressure: Use medium to high drilling speed with steady pressure.

Avoid forcing the bit, which can cause breakage or damage the coating. Pilot Holes: For larger holes, start with a smaller pilot hole to guide the larger bit and reduce stress on the material. Safety Gear: Always wear safety goggles and gloves to protect against metal shavings and sharp edges.

Key Considerations

Material Thickness: Thicker galvanized trays require cobalt or carbide bits for durability. Bit Size: Match the bit size to the hole diameter needed for fasteners or cable entry. Frequency of Use: For frequent drilling, invest in high-quality cobalt or TiN-coated bits to reduce wear and replacement costs.

Using the right drill bit and proper technique ensures clean, precise holes, protects the galvanized coating, and extends the life of your tools, making your work on cable trays more efficient and professional.