Esdabem Nut & Bolt Thread Checker 57-slot — 21 Standard/17 Metric threads, 19 drill gauges, anodized aluminum

The Esdabem 57 Nut and Bolt Thread Checker is an anodized-aluminum gauge plate that identifies 21 standard and 17 metric thread sizes plus 19 drill bit gauges for fast, accurate fastener matching.

Keep the right fastener or drill bit on hand without guessing — this compact, CNC-machined tool verifies internal and external threads to ANSI Class 2B tolerances while resisting wear and corrosion. Built from 6061 anodized aluminum with a SUS 304 stainless steel bolt, the plate is lightweight but rugged for shop, garage, or field use. Laser-engraved marks remain legible and the hanging hole simplifies storage so you can quickly find the size you need.

How quickly can I identify an unknown nut or bolt?

Almost instantly. Slide the bolt or nut into the matching slot or thread gauge and read the laser-etched size — no calculations or charts required. The Go/No-Go fit per ANSI Class 2B helps confirm correct mating hardware.

• 21 imperial sizes and 17 metric sizes for most on-the-shelf fasteners
• Go/No-Go style verification for internal and external threads
• Instant physical fit, no threading tools needed
• Laser-engraved labels for fast visual confirmation

What materials and machining ensure long-term accuracy?

Durability and precision come from quality materials and manufacturing. The gauge is CNC-machined to precise tolerances, then hard-anodized to protect the aluminum surface. A corrosion-resistant SUS 304 stainless steel bolt is included for practical testing and longevity.

• 6061 anodized aluminum body resists corrosion and wear
• CNC machining for consistent thread geometry and reliable fits
• SUS 304 stainless steel bolt for real-world durability
• Laser engraving prevents number and pitch wear over time

Can this tool help me choose the right drill bit for a tapped hole?

Yes — the built-in drill gauges mean you can match drill diameters to thread sizes quickly. The plate includes 19 drill-gauge holes so you can verify drill bit diameters before drilling, reducing the chance of undersized or oversized pilot holes.

• 19 drill gauge holes sized to common tap/drill pairings
• Easily test bit diameter without calipers or charts
• Improves tap success and thread engagement on the first try
• Portable format keeps gauges at your fingertips on the job

How should I store and care for the gauge to maintain accuracy?

Store the plate on a pegboard, tool wall, or in a drawer using the integrated hanging hole for quick access. Wipe with a dry or slightly oiled cloth after heavy use to remove debris and prevent surface moisture; avoid harsh chemicals that can degrade laser marks or anodizing.

• Hang on a pegboard using the built-in hole for easy retrieval
• Clean with a dry cloth or light machine oil to displace moisture
• Avoid abrasive cleaners that may wear engraving over years of use
• Keep with other measuring tools to centralize sizing resources

Who is this tool best suited for? The Esdabem 57 Nut and Bolt Thread Checker is ideal for mechanics, fabricators, maintenance technicians, hobbyists, and anyone who frequently works with threaded fasteners. If you need fast, repeatable thread and drill-size identification — in a durable, pocketable format — this gauge reduces mistakes and saves time when replacing or installing bolts and taps.