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: 6310901

Details

Brand
Aircraft Tool
Finish Type
Uncoated
Item dimensions L x W x H
7.2 x 3.54 x
Material
metal
Shank Type
Straight

🎯Includes pilot cutter for precise hole starting

⚙️2-flute spiral design for smooth chip removal

🛠️Stainless steel for corrosion resistance & durability

₱13516

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Description

🎯 Drill with precision, countersink with confidence — the pro’s choice!

BUILT TO LAST - Robust stainless steel construction resists corrosion and wear for long-term use.
METAL MASTERY - Optimized for metal surfaces, making it the go-to tool for serious projects.
PILOT PERFECT START - Integrated pilot cutter guarantees exact drilling alignment and flawless countersinking.
PRECISION PERFECTED - Professional-grade countersink ensures clean, accurate holes every time.
EFFORTLESS EFFICIENCY - 2-flute spiral design minimizes binding and speeds up chip removal.

The Aircraft Tool Supply Countersink Kit combines professional-grade precision with durable stainless steel and a 2-flute spiral design for efficient chip removal. Featuring an included pilot cutter, it ensures exact hole placement and smooth countersinking on metal surfaces. Trusted by experts and built to last, this kit delivers exceptional value and performance for demanding projects.

Specifications

ASIN	B005VR821G
Best Sellers Rank	#266,162 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #250 in Countersink Drill Bits
Brand	Aircraft Tool Supply
Brand Name	Aircraft Tool Supply
Customer Reviews	4.6 out of 5 stars 108 Reviews
Finish Type	Uncoated
Finish Types	Uncoated
Item Dimensions	7.2 x 3.54 x 1.14 inches
Item Weight	16 ounces
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	1
Number of Packs	1
Number of Pieces	137
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 Count

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₱13516

Duties & taxes included

In stock

Sold byAmazon PhilippinesDelivered 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 Philippines.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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