Transcription of THREAD GAGING REFERENCE GUIDE
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THREAD GAGING REFERENCE GUIDE
Know your threads, L. S. STARRETT COMPANY121 Crescent Street Athol, MA 01331 Telephone (508) 249-3551 Fax (508) 249-8495 Table of ContentsSECTION 1:Fundamentals of Screw THREAD Technology .. 4 - 7 SECTION 2:Definitions and Terminology .. 8 - 11 SECTION 3:Gage Design Contacts .. 12 - 13 SECTION 4:Technical Considerations .. 14 - 23 SECTION 5:Plating, Metric and RFQ .. 24 - 274 Screw THREAD DesignationScrew THREAD DesignationScrew THREAD DesignationScrew THREAD DesignationScrew THREAD DesignationEXAMPLE: .3125 - 24 UNJF - 3A (B).3125 = Nominal Diameter = Maximum Major Diameter24= Number of threads per inchUN= Unified National (60 V- THREAD )J= Controlled root radius High Strength(Minor diameter increased from UN to UNJ.)
Thread series are groups of diameters/pitch combinations distinguished from each other by the number of threads per inch applied to specific diameters. Classes of Thread. Classes of threads are distinguished from each other by the amount of …
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