@fastenedfacts: In this video, we unravel the mystery of bolt heads—your project's ID card! Discover how to interpret the marks: inch/SAE bolts with distinctive radial lines denoting grade and metric bolts with numerical identifiers like 8.8 or 10.9. We highlight the crucial practice of keeping systems separate when upgrading; mixing metric and SAE can spell disaster. Learn the importance of not just selecting a stronger bolt but ensuring compatibility with the right nut, washer, and torque to prevent joint failure. Adopt the quick habit of reading the bolt head, matching the correct nut, and maintaining like-for-like replacements unless specified. Interested in more fastener decoding tips? Comment “markings” to let us know! ##fasteners ##bolts ##hardwaretips ##engineering

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