what does the number stand-for for the countersink cutter? sometime is #40, #21, sometime is 1/4", I need 1/8" or 5/32", do you have?

The number is standard drill size. #40 being slightly larger than 3/32" and #30 slightly larger than 1/8". A quick google will give you a conversion chart. They do also sell them in standard sizes like 3/32 or 1/4, but you may have to contact ATS directly.

Although this seems to be used for rivets on aircraft, can it also be used on solid aluminum and steel millwork projects for flat head machine screws?

Hello, Unfortunately this item will not work for the purpose you are proposing. These pilot cutters are 100 degree 3 flute cutting edge and I believe if you are using AN screws they will require a 82 degree cutter which we do not sell.

What is the Thread size of the cutter's shank? (IE 1/4-28 ?)

It looks like 1/4" 28. I don't have any fine thread nuts around. It catches the first thread on 1/4 20 but won't go any further.

Is it 60 degrees or, like most countersinks, 80 degrees? They don't say in the description.

100 degree counter sinks -- for standard aviation rivets AD426-xxxx

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Aircraft Tool Supply Countersink Kit W/Pilot Cutter

Product ID: 267745733

Details

Brand
Aircraft Tool
Cutting angle string
9E+1 Degrees
Finish type
Uncoated
Material
metal
Shank type
Straight

🎯Pilot cutter ensures pinpoint accuracy

⚙️2-flute spiral for smooth chip removal

🛠️Stainless steel for corrosion resistance

€ 247.02

Duties & taxes included

In stock

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Description

🎯 Nail every hole with precision and durability—because details matter!

BUILT TO LAST - Durable stainless steel construction resists corrosion and wear
METAL MASTERY - Optimized for countersinking in metal surfaces—your go-to for tough projects
FLAWLESS STARTS - Included pilot cutter guarantees exact drilling and countersinking alignment
PRECISION PERFECTED - Professional-grade countersink delivers clean, accurate holes every time
EFFORTLESS EFFICIENCY - 2-flute spiral design minimizes binding and speeds up chip removal

The Aircraft Tool Supply Countersink Kit features a professional-grade, 2-flute spiral countersink bit made from corrosion-resistant stainless steel. It includes a pilot cutter for precise starting points, ensuring clean, accurate countersunk holes in metal surfaces. Ideal for professionals seeking durability and flawless performance in their metalworking projects.

Specifications

ASIN	B005VR821G
Best Sellers Rank	#83,748 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #50 in Countersink Drill Bits
Brand	Aircraft Tool Supply
Brand Name	Aircraft Tool Supply
Customer Reviews	5.0 out of 5 stars 3 Reviews
Cutting Angle String	9E+1 Degrees
Cutting angle string	9E+1 Degrees
Finish Types	Uncoated
Finish type	Uncoated
Item Dimensions	18.3 x 9 x 2.9 centimeters
Item Weight	454 g
Item dimensions L x W x H	18.3 x 9 x 2.9 centimeters
Manufacturer	Aircraft Tool Supply
Material	metal
Material Type	metal
Minimum Bore Diameter	0.06 Inches
Model	Aircraft Tool Supply [SOMETHING]
Number of Flutes	2
Part Number	133KIT
Point Style	Taper Point
Set Name	Countersink Bit Set with Pilot Cutter
Shank Type	Straight
Shank type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 Count

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