Nut & Bolt Thread Checker – 26 Metric & Standard Gauges

ATUOTIN Nut & Bolt Thread Checker — Universal Metric & Standard Fit

Stop guessing which bolt or nut size you need. The ATUOTIN Nut & Bolt Thread Checker gives you fast, accurate thread identification across 26 male and female gauges — covering both metric and standard (SAE) sizes — so every fastener match is right the first time. Perfect for home workshops, automotive projects, metalworking, and professional job sites.

Key Features

• 26 Universal Thread Gauges: Identifies metric threads from M4×0.7 to M12×1.75 and standard threads from #6-32 to 1/2-20, giving you comprehensive coverage for nearly any fastener you'll encounter.
• High-Speed Steel Construction: Crafted from durable, rust-resistant high-speed steel — built to handle demanding workshop conditions and deliver consistent performance over years of use.
• Permanent Etched Markings: Each of the 26 gauges features laser-etched size identifiers that will never fade or wear off, ensuring quick and accurate reading every single time.
• Convenient Ring Design: All gauges rotate freely on a heavy-duty metal ring for effortless one-handed operation and compact storage. The ring keeps every piece together so nothing gets lost.
• Precise & Efficient Measurements: Quickly verify thread pitch and diameter on both nuts and bolts — eliminate costly measurement errors and cut down time spent on every project.

Specifications

• Number of Gauges: 26 (Male & Female)
• Thread Coverage: Metric M4×0.7 – M12×1.75 | Standard #6-32 – 1/2-20
• Material: High-Speed Steel (Metal)
• Package Dimensions: 155 × 150 × 20 mm (approx. 6.1 × 5.91 × 0.79 in)
• Country of Origin: Made in China

What's in the Box

• 1 × Nut & Bolt Thread Checker (26 gauges on ring)

Note: Due to varying monitor settings and lighting conditions, the actual appearance of the item may differ slightly from product images. Please allow a 1–2 cm tolerance due to manual measurement.

For more information on safe tool use and fastener standards, visit the OSHA Tools & Equipment Safety Resource.

Frequently Asked Questions

Q: What thread sizes does this nut and bolt thread checker cover?

A: The ATUOTIN thread checker includes 26 gauges covering metric threads from M4×0.7 to M12×1.75 and standard (SAE/UNC/UNF) threads from #6-32 to 1/2-20, making it suitable for a wide range of fasteners used in home, automotive, and professional metalworking applications.

Q: Is this thread checker suitable for both metric and standard (SAE) bolts and nuts?

A: Yes — it is designed as a universal thread checker. Each gauge identifies both the thread size and pitch for metric and standard fasteners, eliminating the need to own two separate tools.

Q: How durable are the size markings on the gauges?

A: The size identifiers are permanently etched directly into the high-speed steel gauges, so they will not fade, rub off, or wear away with regular use — ensuring long-lasting legibility in even the busiest workshop.

Q: Can this thread checker be used by beginners as well as professionals?

A: Absolutely. The intuitive ring design, clear etched markings, and simple thread-matching process make this tool easy to use for DIY beginners and experienced professionals alike. Just thread the gauge onto the fastener to confirm the size — no special skills required.