Do the holes have threads so you can screw in a bolt?

Yes. The gauge is a thin piece of plastic and each hole is threaded. There is, of course, a limited number of threads because the plastic is thin. I believe it should be used gently to avoid damaging plastic threads. I believe it will be useful for identifying whether a screw has one standard thread (such as 1/4-NC20) or another standard thread (such as 1/4-NF28), but I don't think it can be used to finely test accuracy of threads cut on a lathe. I have not had an occasion to use it yet.

what is the thickness of this gauge?

My micrometer says it's about a quarter inch. The only caveat is it is a polymer gauge, good news is that means it's durable and can flex around truly messed up screws and bolts; the bad news is it's not super precise because it's not stainless or Ti. For example it might be hard to discern a 24 vs. 28 pitch thread, but in my experience in the machine shop it determines the right threading well especially when you are trying to match a screw that's broken, old or damaged.

will this guage work for very small computer screws ?

Yes! The guage goes down to M1.4 which is much smaller than any fastener that your going to find in any computer. The guage also has inch sizes down to #0 (.060 inch). Mike

Why do they show two different kinds of cards in the picture? One says "pitch" at the top right, and the other says "drill". Which one do we get?

The pitch is for metric screws.

Screw Thread Gauge Metric And Sae Recommends Drill Bit Tap

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Description

🛠️ Nail every measurement with confidence—your ultimate thread gauge sidekick!

BUILT TO LAST - Crafted from thick, hard plastic for enduring daily use.
POCKET SIZED POWER - Lightweight and compact—fits effortlessly in your shirt pocket or toolbox.
DUAL STANDARD MASTERY - Seamlessly switch between Metric and SAE measurements.
PRECISION AT A GLANCE - Instantly identify screw sizes with unmatched accuracy.
DRILL TAP MATCHMAKER - Recommends the perfect drill bit or tap size every time.

The BCP675 Screw Thread Gauge is a professional-grade tool designed to quickly and accurately measure screw sizes across both Metric (1.6mm to 16mm) and SAE (0 to 3/4") standards. Constructed from durable thick hard plastic, it resists oil and grease, ensuring longevity and easy maintenance. This compact, lightweight gauge also recommends the ideal drill bit or tap size, making it an indispensable companion for mechanics and hobbyists alike.

Specifications

ASIN	B07K7W3NQQ
Best Sellers Rank	#133,523 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #320 in Dimensional Measurement Gauges
Brand	BCP Fasteners
Colour	Black
Compatible Groove Diameter	1.6 Millimeters
Country Of Origin	USA
Customer Reviews	4.6 out of 5 stars 2,706 Reviews
Drive System	External Hex
Exterior Finish	Plastic
Fastener Size	No. 0
Fastener Type	Machine Screw
Finish Types	Uncoated
Global Trade Identification Number	00688938509163
Head Style	Round
Head Type	Flat
Item Diameter	1.6 Millimetres
Item Weight	0.02 Pounds
Manufacturer	BCP Fasteners
Material	Plastic
Material Type	Plastic
Metal Type	plastic
Model	BCP675
Number of Pieces	1
Part Number	BCP675
Point Style	Fein
Screw Head Style	Round
Screw Point Style	Fein
Set Screw Thread Type	UNC, UNF
Size Name	No. 0
Thread Class	fine
Thread Coverage	Fully Threaded
Thread Size	0-80
Thread Style	coarse fine
Thread Type	coarse fine
UPC	688938509163
Unit Count	1.0 Count

Reviews

P**C

Très pratique !

J'ai differentes jauges de filetage, mais celle-ci est particulièrement utile par son principe et sans légèreté. En un clin d'œil ont peut vérifier diamètre et pas. Seule contrainte : elle est en plastique, donc il faut en tenir compte et ne pas forcer si la tige filetée n'entre pas de façon fluide.

6.10.2025

T**N

Well made and covers all threads

Well made, has all internal threads. I have more metric hardware coming from China , so it is good to have

23.02.2026

D**J

Great tool

It could do with been a little thicker. However it’s a great product. I deal with both metric and imperial threads it’s a very easy check

7.01.2026

G**S

Útil, con calidad.

3.10.2025

C**G

A must if u hav drill bits in a disorganised chaos

Just very helpful

18.03.2025

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Screw Thread Gauge | Metric and SAE | Recommends Drill Bit & Tap Size (BCP675)

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