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

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

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¥28030

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Drill with precision, finish with pride.

BUILT TO LAST - Durable stainless steel construction resists corrosion and wear
PINPOINT ACCURACY - Included 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
VERSATILE METAL MASTERY - Ideal for countersinking a variety of metal surfaces—your go-to for any project

The Aircraft Tool Supply Countersink Kit features a professional-grade, corrosion-resistant stainless steel bit with a 2-flute spiral design for efficient chip removal. It includes a pilot cutter for precise starting points, making it ideal for creating clean, accurate countersunk holes in metal surfaces.

Specifications

ASIN	B005VR821G
ASIN	B005VR821G
Best Sellers Rank	#178,157 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #150 in Countersink Drill Bits
Brand Name	Aircraft Tool Supply
Customer Reviews	5.0 5.0 out of 5 stars (3)
Customer reviews	5.0 5.0 out of 5 stars (3)
Cutting Angle String	9E+1 Degrees
Date First Available	9 September 2014
Finish Types	Uncoated
Is Discontinued By Manufacturer	No
Item Dimensions	18.3 x 9 x 2.9 centimeters
Item Weight	454 g
Item model number	Aircraft Tool Supply [SOMETHING]
Manufacturer	Aircraft Tool Supply
Manufacturer	Aircraft Tool Supply
Material Type	metal
Minimum Bore Diameter	0.06 Inches
Model	Aircraft Tool Supply [SOMETHING]
Number of Flutes	2
Point Style	Taper Point
Product Dimensions	18.3 x 9 x 2.9 cm; 453.59 g
Shank Type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 Count

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