,.技术条件:按HB1770。18 中工业总公司1996-09-13发布66 1997-01-01实施,HXIMIM MAJOR DIAHETER OR LFSS TMIEIU) LEADPA (Lt) SHALL EXTEND To mI“ lWJ TBREADS OF THE HEAD BMNG
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1、HXIMIM MAJOR DIAHETER OR LFSS TMIEIU) LEADPA (Lt) SHALL EXTEND To mI“ lWJ TBREADS OF THE HEAD BMNG SURFACE. SCREWS OF GFZATER LENGTH SHALL HAfE COMPLETE THREAX FOR A MINIhiM OF FOUR MAXIMUH MAJOR DIAMETERS. HRTEFUAL: CORROSION-RESISTANT STEELS: QQ-S-763. CL4SS 303 COND A. CLASP 4l6: COM) A, HEAT TREAT TO 125,000-11i5,OOO PSI. CLASS 420, GOND A, HEAT TREAT TO o,ooo-o,ooo PSI. SCREWS SHALL BE FILCE OF ALL PROJECTING BURRS, OBSERW AT 3X i.IAONIFICATION. DIMENSIONS IN INCHES. W DIAM。
