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

Aircraft Tool Supply Countersink Kit W Pilot Cutter

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Rp3583195

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Description

🎯 Drill with precision, finish with pride – the countersink kit that means business.

BUILT TO ENDURE - Robust stainless steel construction guarantees long-lasting durability and corrosion resistance.
PINPOINT ACCURACY - Includes pilot cutter for exact hole placement and seamless countersinking.
PRECISION PERFECTED - Professional-grade countersink for flawless, clean holes every time.
EFFORTLESS EFFICIENCY - 2-flute spiral design minimizes binding and speeds up chip evacuation.
VERSATILE METAL MASTERY - Optimized for metal surfaces, making it your go-to for diverse projects.

The Aircraft Tool Supply Countersink Kit features a professional-grade, 2-flute spiral bit made from corrosion-resistant stainless steel. It includes a pilot cutter for precise hole starts and is engineered for clean, accurate countersinking in metal surfaces. Trusted by professionals for durability and smooth operation, this kit delivers exceptional value and performance.

Specifications

ASIN	B005VR821G
Best Sellers Rank	#195,633 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #194 in Countersink Drill Bits
Brand	Aircraft Tool Supply
Brand Name	Aircraft Tool Supply
Customer Reviews	4.6 out of 5 stars 105 Reviews
Finish Type	Uncoated
Finish Types	Uncoated
Item Dimensions	7.2 x 3.54 x 1.14 inches
Item Weight	1 Pounds
Item dimensions L x W x H	7.2 x 3.54 x 1.14 inches
Manufacturer	Aircraft Tool Supply
Material	metal
Material Type	metal
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
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 Count

Reviews

C**S

8.11.2025

B**Y

31.01.2024

J**D

14.12.2021

C**L

20.08.2023

M**N

19.01.2018

J**O

29.03.2024

A**R

1.03.2017

F**N

27.06.2019

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