ATUOTIN 26-Piece Bolt & Nut Thread Checker Gauge – Standard & Metric
ATUOTIN 26-Piece Bolt & Nut Thread Checker Gauge – Standard & Metric
ATUOTIN 26-Piece Bolt & Nut Thread Identifier Gauge – Standard & Metric
Never guess a bolt size again. The ATUOTIN Bolt & Nut Thread Checker gives you instant, accurate thread identification across 26 standard and metric sizes — all in one compact, ring-mounted set. Whether you're working on a home repair, metalworking project, or shop maintenance task, this thread gauge keeps your workflow fast and error-free.
Key Features
- 26 Male & Female Thread Gauges: Covers metric threads from M4×0.7 to M12×1.75 and standard (UNC/UNF) threads from #6-32 to 1/2-20, giving you a truly universal fit for the most common fastener sizes.
- High-Speed Steel Construction: Built from durable, rust-resistant high-speed steel so the gauge stands up to demanding shop environments and repeated daily use without losing accuracy.
- Permanent Etched Markings: Every gauge leaf features laser-etched size identifiers — they won't fade, rub off, or wear away, ensuring quick and reliable thread recognition job after job.
- Rotating Ring Design: All 26 gauges pivot freely on a sturdy metal ring for smooth, one-handed operation. The ring keeps every piece together so nothing gets lost in the toolbox.
- Precise & Efficient: Quickly verify thread pitch and dimension on nuts and bolts before assembly — eliminate costly measurement errors and save valuable time on every project.
Specifications
| Material | High-Speed Steel (Metal) |
| Number of Gauges | 26 (Male & Female) |
| Metric Range | M4×0.7 to M12×1.75 |
| Standard Range | #6-32 to 1/2-20 |
| Package Size | 155 × 150 × 20 mm (6.1 × 5.91 × 0.79 in) |
| Country of Origin | Made in China |
What's in the Box
- 1 × ATUOTIN Nut & Bolt Thread Checker (26-piece gauge set on ring)
Note: Due to variations in monitor settings and lighting, actual color may differ slightly from product images. Please allow a 1–2 cm tolerance due to manual measurement.
For more information on fastener standards and thread specifications, visit the NIST Standards Resource Center.
Frequently Asked Questions
Q: What thread sizes does the ATUOTIN bolt and nut thread checker cover?
A: The set includes 26 male and female thread gauges covering metric sizes from M4×0.7 to M12×1.75 and standard (UNC/UNF) sizes from #6-32 to 1/2-20 — the most commonly used fastener thread sizes for home and professional use.
Q: Is this thread gauge set suitable for both professional mechanics and home DIY users?
A: Absolutely. The ATUOTIN thread checker is crafted from rust-resistant high-speed steel with permanent etched markings, making it durable enough for professional metalworking shops while remaining lightweight and easy to use for everyday home repairs.
Q: How do I use the bolt and nut thread identifier gauge?
A: Simply fan out the individual gauge leaves from the ring, and test-fit the male or female gauge against your bolt or nut threads. When a gauge slides on cleanly without slop or binding, you've found the correct thread size and pitch. The etched label on each leaf instantly tells you the size.
Q: Will the size markings fade or wear off over time?
A: No. The size identifiers are laser-etched directly into the high-speed steel — not printed or painted — so they remain permanently legible even after years of heavy use in a workshop environment.