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.)F= Fine THREAD series3= THREAD classA= External threadB= Internal threadScrew THREAD AssemblyFUNDAMENTALS OF SCREW THREAD TECHNOLOGY5 SECTION 1 Functional Diameter SizeWidth of THREAD Ridge = Width of THREAD GroovePitch Diameter Size + Variations of THREAD Elements and Characteristics = Functional Diameter SizePitch Diameter SizeThe Functional diametersize is the Pitch diam-eter size plus the cumu-lative effect of variationsin lead, (including unifor-mity of helix) flankangle, taper, and round-ness.
THREAD GROOVE. ß à = Distributed by: Gage Crib Worldwide Inc 6701 Old 28th St SE, Suite B Grand Rapids, MI 49546-6937 USA Phone: 001.616.954.6581 Web: www.gagecrib.com . 6. FUNDAMENTALS OF SCREW THREAD TECHNOLOGY. Reference Federal Standard H28/20 Œ Systems of Gaging. t. 5.1.3. SYSTEM 21. Œ GO/NO GO GAGING
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