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.)
Screw thread acceptability criteria are in accordance with Section 6 of ASME B1.3M-1992. Also see subsection 5.7. Other Reference Standards. t. ASME B1.1 ASME B1.1 Œ . Unified Inch Screw Threads. t. ASME B1.2 ASME B1.2 Œ . Gages and Gaging for Unified Inch Screw Threads. t. ASME B1.3M ASME B1.3M Œ
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