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HARFINGTON Twist Drill Bit 37/64″ Dia High-Speed Steel 4341 Metric Drill Bits 5.7″ Overall Length with Black & Gold Oxide Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel 37/64″ x 5.7″ x 3/8″
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What people love (and don’t love)
What people love
High quality and sharp drill bit that runs true
Good value for the price with fast shipping
Effective for drilling hard metals including steel and stainless steel
Strong performance with recommended slow and steady use with oil
Perfect size for specific tasks and replacement needs
What people don’t love
Some reports of poor quality with drill bit bending under heavy use
Minor percentage of users gave low ratings, indicating occasional quality issues
Reliable and sharp drill bit ideal for DIYers, though may not withstand very heavy-duty professional use.
If you need a larger, jobber-length bit for tougher materials, the HARFINGTON 37/64″ twist drill bit is designed to handle hard metals with less wandering and smoother chip evacuation. It’s made from high-speed steel (HSS) 4341 and finished with a black & gold oxide coating to support wear resistance during demanding drilling tasks.
You can view the current price and full details on Amazon here.
The fully ground spiral flute design helps clear debris quickly to reduce friction and heat buildup, while the 135° split point helps the bit start more accurately on the surface—especially useful when drilling into stainless steel and alloy steel. With a straight shank (3/8″) and an overall length around 5.5–5.7 inches, it’s a solid pick when you need reach without stepping up to specialty tooling.
Recommended for: stainless steel, mould steel, alloy steel, cast iron, aluminum alloy, copper, hard plastics, and even wood when needed. Not recommended for: glass, tile, wall, stone, or ceramic materials.
Tip: Use appropriate cutting fluid or oil and manage speed/pressure to help extend bit life, especially in harder metals.
37/64″ (14.29 mm) cutting diameter with straight 3/8″ shank
High-speed steel (HSS) 4341 construction for hardness and wear resistance
Black oxide & gold oxide finish
135° split point helps reduce walking for more accurate starts
Fully ground spiral flutes to evacuate chips and reduce heat
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