What are the center 8,10,11,14,19 and 28 blades denominated in?

Threads per inch. Those are the Whitworth blades, ie the 55˚ ones. To translate, since they word things a bit oddly: SAE/Imperial is measured in TPI, with a 60˚ thread angle. ie your 8-32 x 1" type screws. Whitworth/American/US is measured in TPI, and is basically the same as SAE except with a 55˚ thread angle and rouded crests. Metric is measured in the distance from thread to thread (the thread pitch), with a 60˚ thread angle. These are for your ISO screws. ie M4 course, M6 fine, etc.

Is this small enough to measure female thread sizes?

I don't have mine handy right now. but I think you can measure the inside thread pitch down to about 5/16", and 8mm. I haven't used mine yet, but the stampings on the individual blades don't appear very clear.

How are the gauge findings used for purchasing a screw ( an initial search doesn't find such details listed in screw descriptions on store sites ) ?

You will need to use this tool in conjunction with a chart showing the common SAE and Metric bolt/screw sizes. This tool will determine the number of threads per inch or mm. You will also need the diameter of your fastener before heading to the store. For instance the common threads for a SAE 1/4” coarse bolt is 20 TPI (threads per inch) - while a 1/4” fine bolt has 28 TPI. This set is for external threads. You keep comparing the various thread gauges in the set until you match your fastener - use that information along with the diameter of your fastener to make the final determination. The last bit of information you need would be the length of the fastener and the type of head. So a common 1/4” SAE bolt that is 2” long would be described as 1/4”-20 X 2.

One side is marked Whitworth and the other is marked Metrisch, but nothing points to which end is which.

One says "Metrisch" which is German for Metric. These have numbers in tenths or hundredths marked on each tong. The other side is standard (American) and have whole numbers on each tong, along with a "G". There's a middle section which are Whitworth threads - those are same threads per inch as Standard, but each tooth has a 55° angle (as apposed to the 60 degree on the teeth of the other thread types).

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Description

⚙️ Nail every thread pitch like a pro — don’t let your tools fall behind!

LOCK UP DEVICE FOR STABILITY - Lock your gauge in place to guarantee consistent, error-free readings.
PRECISION THREAD ANGLE MASTERY - Dual 55° & 60° gauges ensure flawless thread angle verification every time.
UNIVERSAL THREAD COMPATIBILITY - Covers Metric, Imperial, and US standards for all your industrial measurement needs.
ULTRA FINE MEASUREMENT ACCURACY - Achieves an impressive 0.01% accuracy, empowering confident, professional results.
RUST RESISTANT STAINLESS STEEL BLADES - Durable wire-drawn stainless steel blades resist corrosion and maintain accuracy.

The ChgImposs Screw Gauge Set is a premium industrial measurement tool featuring dual 55° and 60° thread pitch gauges compatible with Metric, Imperial, and US standards. Crafted from corrosion-resistant stainless steel with a secure lock-up device, it delivers ultra-precise thread size and angle verification with 0.01% accuracy, making it an essential companion for metal lathe operators and precision engineers.

Reviews

A**D

thread gauges

very good selection of blades good value every one should have one thanks

24.07.2025

J**Y

Useful tool

Nicely made essential tool very handy would not be without it.

9.05.2025

C**G

Perfect for a small toolbox.

Much smaller than expected (but it does show size in advert) diffecult to handle without a 'pushing out' bit to use to impossible with oily hands. No instructions explaining what's what and how to use the tool, very poorly marked. One of the 2 'screw fastners' does not adjust, cross thread I think, so that end is very difficult to use. All in all I'll throw in a toolbox but look to buy a bigger and better made set. BUT on a positive if you just wanted a small set for those rare occasions then these are ideal

2.02.2025

F**6

Auseful micosaw set

A useful set of mico saws - all contained within a case and each blade can be opened/closed. Easy to use.

21.04.2025

D**C

must for a toolbox

good compact design ideal for checking threads to match the correct size, ideal for metric and imperial, matches the thread perfectly great value for money.

15.09.2025

P**F

Handy tool

Very handy tool for thread identification and good value for money in the toolbox

23.11.2024

B**

Good quality

Arrived quickly

12.03.2025

I**.

All fine

30.07.2025

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Manufacturer	FLXDirect
Part number	EPC_MEA_000
Item Weight	1 g
Package Dimensions	8.4 x 3.5 x 1.5 cm; 1 g
Manufacturer reference	EPC_MEA_000
Item Package Quantity	1
Measurement Accuracy	0.01%
Included components	1 x Screw Gauge Set
Batteries included?	No
Batteries Required?	No

ChgImposs Metric & Imperial & US Screw Gauge SAE Whitworth 55 Degree & Metric 60 Degree & & US 60 Degree Thread Pitch Gauge for Industrial Measurement

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