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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Description

🎯 Drill with precision, finish with pride.

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

The Aircraft Tool Supply Countersink Kit features a professional-grade, 2-flute spiral bit made from corrosion-resistant stainless steel, paired with a pilot cutter for precise hole starting. Designed specifically for metal surfaces, it ensures clean, accurate countersunk holes with enhanced chip removal and durability.

Specifications

Asin	B005VR821G
Best Sellers Rank	#138 in Countersink Drill Bits
Date First Available	9 September 2014
Is Discontinued By Manufacturer	No
Item Model Number	Aircraft Tool Supply [SOMETHING]
Manufacturer	Aircraft Tool Supply
Product Dimensions	18.3 x 9 x 2.9 cm; 453.59 g

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SI$2529

Duties & taxes included

In stock

Sold byAmazon Solomon IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Solomon Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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