MikeGarageWorks
★★★★★“I would keep this in the garage because it makes sorting mystery nuts and bolts much faster before starting a repair.”
A compact thread checker set for quickly matching common nut and bolt thread sizes in both SAE and metric formats.

Hard to match unknown nuts and bolts.
Match the size and move on faster.
Determine the thread size of common bolts and nuts in seconds without repeated measurements or guesswork. Save time and reduce guesswork.

Includes 14 imperial/imperial sizes and 12 metric sizes to help you quickly identify most nuts and bolts on the market.

Blue represents imperial units, red represents metric units; color coding facilitates quick differentiation. Laser-etched dimension markings are resistant to fading even with repeated use.

Made of high-strength aluminum alloy, rust-resistant and impact-resistant. Lightweight and portable, yet robust and durable enough to withstand frequent use.

Suitable for car repair, bicycle maintenance, machining, and home DIY projects. Quickly identifies the correct thread size of bolts and nuts in daily workshop, garage, and maintenance work.

| System | SAE / Imperial + Metric |
|---|---|
| SAE Range | 1/4-28 to 1/2-20 |
| Metric Range | M4-0.7 to M12-1.75 |
| Color Coding | Blue = SAE / Imperial, Red = Metric |
| Use | Checks both external bolt threads and internal nut threads |
| Material | Aluminum alloy checker pieces |
| Storage | Flexible steel cable loop |
| Applications | Car repair, bike maintenance, machine work and home / DIY repair |
Swipe to explore →
Find thread sizes faster.
Color coding keeps systems easy to spot.
Useful across common repair tasks.
Cable loop keeps the set together.
Yes. The set includes blue SAE / Imperial checkers and red metric checkers.
Yes. It is designed to check both external bolt threads and internal nut threads.
The SAE / Imperial range runs from 1/4-28 to 1/2-20.
The metric range runs from M4-0.7 to M12-1.75.
It is suited for common tasks such as car repair, bike maintenance, machine work and home or DIY repair.
Keep a quick SAE and metric thread reference ready in your toolbox for common repair and maintenance jobs.
BUY NOW — 50% OFF“I would keep this in the garage because it makes sorting mystery nuts and bolts much faster before starting a repair.”
“The blue and red color coding looks really useful when switching between SAE and metric hardware.”
“I like that it checks both nuts and bolts instead of only one side of the thread.”
“The cable loop is a smart detail because all the sizes stay together instead of getting scattered in a drawer.”
“This would be handy for bike work, home repairs and small automotive jobs when I need to identify a thread quickly.”
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