What people love (and don’t love)
What people love
- High quality with a very sharp edge, performing well on hard metals like stainless and alloy steel.
- Good value for the price and accurately sized.
- Effective at drilling through mild and hardened steel, holding up well during tough use.
- Received quickly and in good condition as described by the supplier.
- Easy to use, even with basic drills like Black & Decker.
What people don’t love
- Some users reported poor durability, with the drill bit bending when used on cast iron.
- Longevity is uncertain as some users have only tested it briefly.
- Not all materials tested thoroughly by users; some recommend only mild metals without extensive steel testing.
Overall, a sharp and well-priced drill bit that works effectively on various metals but may have durability concerns under very tough conditions.
Summary based on customer review evidence.
Quick facts
- Brand: HARFINGTON
- Price: USD 7.82
- Rating: 4.50 (106 reviews)
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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