Manalete Thread Checker Anodized Nut & Bolt Gauge — 30 Metric & Imperial Threads + 19 Drill Sizes (Red)

The Manalete Thread Checker is a compact, CNC-machined nut and bolt gauge that quickly identifies 30 thread sizes in both metric and imperial systems and includes a 19-size drill bit gauge.

Keep the right fastener on hand and avoid guessing sizes. This lightweight, anodized aluminum thread identifier combines Go/No-Go Class 2B threaded samples with clear laser-etched scales so you can match nuts, bolts, screws and drill bits at a glance. Its compact footprint and pre-drilled mounting holes make it easy to store in a toolbox, hang on a workshop wall, or carry to the job site.

How accurately does this gauge identify threads?

The Manalete gauge uses CNC-machined threaded plugs and premium steel bolts manufactured to Class 2B ANSI tolerances, giving repeatable, workshop-grade fits for most automotive and machinery fasteners. You match a nut or bolt to the sample until it either runs freely (Go) or binds (No-Go), eliminating guesswork.

• Metric coverage: M2 x 0.4 through M14 x 2.0
• Imperial coverage: #2-56 up to 5/8-18
• Go/No-Go Class 2B gauging for reliable fit checks
• CNC-machined components for consistent thread profiles

What drill bit sizes are included, and how are they arranged?

This gauge includes 19 drill bit reference holes: 6 metric holes from 4 mm to 14 mm and 13 imperial holes from 1/16" to 1/2". The holes are laser-etched and sized for quick insertion checks, with scales on both edges to help confirm measurements visually.

• 6 metric drill sizes: 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 14 mm
• 13 imperial drill sizes from 1/16" to 1/2"
• Pre-drilled mounting holes for wall or tool board storage
• Scales in inches and centimeters for quick reference

Will this hold up to regular shop use?

Yes — the body is anodized aluminum to resist corrosion and wear, while the threaded samples use hardened steel for durability. Laser-etched markings maintain legibility over time, and the small footprint means less chance of dropping or misplacing the gauge during projects.

• Anodized aluminum body for lightweight durability
• Premium steel bolts and threads for long-term accuracy
• High-contrast white-on-red lettering for easy reading
• Compact, portable design with mounting options

How will this tool speed up my repair or build projects?

By removing measurement guesswork, the Manalete Thread Checker helps you pick the correct fastener or drill bit the first time, saving time and preventing stripped threads or wrong replacements. It’s ideal for rapid on-the-bench checks or quick verification while servicing equipment.

• Instant identification avoids trial-and-error fitting
• Reduces downtime when locating correct replacement bolts
• Useful for inventorying fasteners and organizing a toolbox
• Handy gift for mechanics, fabricators, and DIYers

Who is this for? The Manalete Thread Checker is designed for mechanics, maintenance technicians, machinists and home DIYers who need a reliable, portable method to identify both metric and imperial threads and common drill sizes. If you service vehicles, maintain machinery, or build projects at home or on-site, this compact gauge reduces mistakes and speeds up fastener selection without heavy inspection equipment.