The AN Bolt Gauge is an essential tool for aircraft mechanics, maintenance engineers, and serious homebuilders who need fast, accurate identification of AN bolt specifications in the workshop or on the flight line.
Designed to size all AN bolts up to 5/8" diameter and up to 5 inches in length, this gauge eliminates guesswork when sorting fasteners, matching replacements, or verifying hardware during inspection. Rather than relying on calipers and thread pitch gauges separately, the AN Bolt Gauge consolidates bolt sizing into a single, purpose-built tool — saving time and reducing the risk of misidentification.
Key Features
- Sizes all AN bolts up to 5/8" diameter
- Accommodates bolt lengths up to 5 inches
- Clearly marked diameter and length references for quick identification
- Compact and durable — built for regular workshop use
- Compatible with the full range of AN/MS hardware standards
Why Accurate Bolt Identification Matters
Using the wrong fastener in an aircraft application is a serious safety risk. AN hardware is specified by both diameter and grip length, and substituting an incorrect bolt — even one that appears to fit — can compromise structural integrity or fail to meet airworthiness requirements. The AN Bolt Gauge makes it straightforward to confirm you have the right fastener before it goes into the airframe.
Ideal For
- Licensed aircraft maintenance engineers (LAMEs)
- Experimental and homebuilt aircraft builders
- Aero clubs and maintenance organisations
- Anyone working with AN/MS hardware on certified or experimental aircraft
A low-cost tool that pays for itself the first time it prevents a misidentified fastener from reaching the aircraft.
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