Where is the size 12? this product appears to skip 12 and go from size 10 to 1/4?

#12 is not 1/4"---imperial machine screw sizes are in 64th's--- Therefore, #12 = 12/64 = 6/32 = 3/16---NOT 1/4

I thought it supposed to have thread in it

This is a thread gauge. The thread gauge is on the back side of the gauge. One of the listing pictures clearly shows this.

How does this tool define internal thread pitch (e.g. nuts)?

This gauge doesn't measure "internal" threads, only external threads. It can find the size of a nut but not the thread pitch of a nut. However, if you know the size of the nut then it's pretty easy to determine the thread pitch. There's only two thread options per size so just look at the threads and you can see if it's the coarse thread or fine thread. For instance, if the gauge determines that the nut is 1/2" then your two thread options are 13 or 20. The gauge shows you that part. If the threads look fine then you have a 20 thread if it looks coarse then you have a 13 thread. Hope this helps.

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Marine Bolt Supply Nut, Bolt & Screw Gauge (Standard & Metric) (Coarse & Fine) Diameter, Length & Thread Pitch (Green)

Marine Bolt Supply Nut, Bolt & Screw Gauge (Standard & Metric) (Coarse & Fine) Diameter, Length & Thread Pitch (Green)

Product ID: 414756236

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Details

Material
Plastic
Exterior Finish
Unfinished
Manufacturer Grade
Grade 2
Head Style
Hex
Colour
Green

📏Dual Standard & Metric Precision

🔩Covers Coarse & Fine Threads

🛠️Durable 1/4" Thick Plastic Build

Description

🔧 Nail Every Thread Like a Pro – Don’t Get Left Behind!

ROBUST READY - Crafted from tough 1/4" thick plastic, this gauge withstands daily workshop demands without wear.
COMPACT PRECISION - At just 8-3/4" long and 3-1/4" wide, it fits perfectly in your toolkit for on-the-go accuracy.
TRUSTED MARINE GRADE - Proudly USA-made with MarineBoltSupply branding, delivering professional-grade reliability and quality.
THREAD PITCH PERFECTION - Accurately identify coarse and fine thread pitches to ensure flawless fastener compatibility every time.
UNIVERSAL THREAD MASTERY - Seamlessly measure both fractional (#4 to 1") and metric (3mm to 22mm) screws, bolts & nuts with one sleek tool.

The Marine Bolt Supply Nut, Bolt & Screw Gauge is a premium, durable plastic tool designed for precise measurement of both standard (fractional) and metric fasteners. It covers a wide size range (#4 to 1" fractional, 3mm to 22mm metric) and supports coarse and fine thread pitches, making it an essential, compact companion for professionals demanding accuracy and reliability in every project.

Specifications

Material	Plastic
Exterior Finish	Unfinished
Manufacturer Grade	Grade 2
Head Style	Hex
Colour	Green
Fastener Type	Hexagon Bolt
Brand	Marine Bolt Supply
Thread Type	UNC
Item Diameter	1 Inches
Thread Style	Right Hand
Item Hardness	Grade 5
Head Type	Hex
Thread Class	3B
Number of Pieces	1
Manufacturer	Marine Bolt Supply
Country of Origin	USA
Item model number	1-NBG
ASIN	B06X15YV6X

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