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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Aircraft Tool Supply Countersink Kit W/Pilot Cutter by Aircraft Tool Supply

Product ID: 347818085

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

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Description

🎯 Drill with precision, finish with pride!

METAL MASTERY - Optimized for metal surfaces, making it your go-to for versatile projects
BUILT TO ENDURE - Durable stainless steel construction resists corrosion and wear
PINPOINT ACCURACY - Integrated pilot cutter guarantees exact starting points for perfect countersinks
PRECISION PERFECTED - Professional-grade countersink for flawless, clean holes every time
EFFORTLESS EFFICIENCY - 2-flute spiral design minimizes binding and speeds up your workflow

The Aircraft Tool Supply Countersink Kit features a professional-grade, 2-flute spiral bit made from corrosion-resistant stainless steel. Equipped with a pilot cutter for precise starting points, it delivers clean, accurate countersunk holes in metal surfaces, making it an essential tool for professionals and serious DIYers alike.

Specifications

ASIN	B005VR821G
Best Sellers Rank	789,148 in DIY & Tools ( See Top 100 in DIY & Tools ) 702 in Countersink Bits
Brand	Aircraft Tool Supply
Cutting Angle String	9E+1 Degrees
Finish Types	Uncoated
Item Dimensions	18.3 x 9 x 2.9 centimetres
Item Weight	1 Pounds
Manufacturer	Aircraft Tool Supply
Manufacturer Part Number	133KIT
Material	metal
Minimum Bore Diameter	0.06 Inches
Model Number	Aircraft Tool Supply [SOMETHING]
Number of Flutes	2
Point Style	Taper Point
Set Name	Countersink Kit
Shank Type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 count

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