Will these drill & tap 1/4" thick cast iron?

Thanks for your question. The max depth of drilling and tapping for this product is 4mm. 1/4" equals to 6.35mm. So it's too thick. This kind of combination drill & tap bits are only suitable for thin metal sheets, no matter what the brand is. In addition, it's suggested that you use M2 HSS bits or M35 cobalt bits to drill cast iron.

What’s the three count example 1/4 what 20 - 28 kinda important

Thanks for your question. Take BSW 1/4-20 as an example. "BSW" means British Standard Whitworth screw thread series. "1/4" is the inch diameter of the bit. "20" means 20 threads per inch. Try to search the keyword "BSW size" on Google or Bing and you'll learn more. Actually, we don't quite understand your question. If the answer isn't what you need, please reply to us.

Will it go through steal?

This set of tap drill bits are suitable for wood, plank, plastic and soft metal like aluminum plate and sheet iron. We also have TiAIN Finish HSS-Co M35 Drill and Tap Combination Bits for sale. They can penetrate stainless steel. M10 tap bit, http://www.amazon.com/dp/B07D6K27V7 M8 tap bit, http://www.amazon.com/dp/B07D6JNVQ1 M6 tap bit, http://www.amazon.com/dp/B07D6K75QW M5 tap bit, http://www.amazon.com/dp/B07D6HWXMC M4 tap bit, http://www.amazon.com/dp/B07D6JK5G4 M3 tap bit, http://www.amazon.com/dp/B07D6JTG57

Is there 1/2"? its all mm? no SAE?

Sorry, there isn't 1/2". SAE bits are available here: https://www.amazon.com/gp/product/B077JDZF28 Fractional inch bits are available here: https://www.amazon.com/gp/product/B072LYMS6P

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M35 Cobalt Drill & Tap Bit, TiAlN Coated, M3x0.5mm, 1/4" Hex Shank

M35 Cobalt Drill & Tap Bit, TiAlN Coated, M3x0.5mm, 1/4" Hex Shank

Product ID: 118740511

Details

Cutting Angle String
118 Degrees
Cutting Diameter
3 Millimeters
Finish Type
Titanium
Material
Cobalt Steel
Shank Type
Hex

🔥TiAlN Coating - heat & wear resistant

🔩118° Split Point - precise starts

⚙️M35 Cobalt Steel - ultra durable

€ 20.15

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Description

🔧 One bit to rule them all — drill, tap, and dominate your projects with precision!

PRECISION PERFECTED - 118° split point and dual twist flutes deliver burr-free holes and flawless threads every time.
UNMATCHED DURABILITY - Crafted from premium M35 cobalt steel to conquer stainless steel, cast iron, and more without dulling.
DUAL ACTION EFFICIENCY - Drill and tap in one seamless step, cutting your workflow time in half.
HEAT RESISTANT COATING - Titanium-Aluminum-Nitride finish reduces heat buildup, extending tool life under heavy use.
UNIVERSAL COMPATIBILITY - 1/4" hex shank fits standard drill chucks and drivers for quick, secure tool changes.

The Hymnorq M35 Cobalt Drill & Tap Bit combines drilling and tapping into a single, high-performance tool made from heat-resistant M35 cobalt steel with a TiAlN coating. Featuring a 118° split point and dual twist flutes, it ensures precise, burr-free holes and threads in tough metals. Its 1/4" hex shank offers versatile compatibility, making it an essential upgrade for professionals demanding speed, durability, and accuracy.

Specifications

ASIN	B07D6JTG57
Best Sellers Rank	#123,358 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #101 in Countersink Drill Bits
Brand	HYMNORQ
Brand Name	HYMNORQ
Customer Reviews	4.0 out of 5 stars 11 Reviews
Cutting Angle String	118 degrees
Cutting Diameter	3 millimeters
Finish Type	Titanium Aluminum Nitride
Finish Types	Titanium Aluminum Nitride
Included Components	1 piece of M8 TIAIN coated cobalt combination drill and tap bit
Manufacturer	Hymnorq
Material	Cobalt Steel
Material Type	Cobalt Steel
Number of Flutes	2
Number of Pieces	1
Part Number	LZXGY0134US
Point Style	Split Point
Shank Type	Hex
Surface Recommendation	Metal
Tool Flute Type	Spiral
UPC	666389336378
Unit Count	1 Count

Reviews

L**E

Good product, cuts to spec.

Used it to re-tap a thin piece of metal in a light fixture and size up the hole .5mm. Worked great.

12.12.2023

J**Y

Good value

I build rc pulling sleds and have to drill/tap allot of holes. I've tried different drill taps but they tend to not live long... so far I havent dulled or broken one of these

17.10.2019

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€ 20.15

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In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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