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Bolt head markings—what do the letters and symbols mean | FAQ
How To Identify Bolts (US Standard and Metric)
IAP 82 20A Aircraft Hardware 25min
Determining Bolt Grade and Head Markings
How to find bolt & nut size, metric or imperial.
How to identify a metric or imperial bolt quickly!
Fastener Identification Guide
Bolt Grades: How to identify different grades of bolts and common uses
The Nuts and Bolts of Screws: Bolt ID for Machinists, Mechanics, and Engineers - Haas Tip of the Day
How to Identify Thread Pitch and Size | Tech Tips | Swagelok [2020]
Nuts & Bolts - How Metric Bolts are Measured
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Last Updated: October 1, 2026
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Summary
Fasteners bear all forms of markings on their heads, from number and letters, to shapes and hash marks. But what do they mean? This is a PowerPoint video on how to Okay we're going to do a little This video will introduce students on the different types of aircraft hardware. This is helpful information for a situation where you need to replace a piece of hardware, such as a If you work with mechanical things, you must know this. Grabbing the wrong family of wrench or ratchet is frustrating. Know before ... Curious how you figure out the size of the Often you might find yourself asking "What This step-by-step video will teach you how to correctly