Selection and Application of unified thread

UNC Coarse Thread Series This series is usually mass- bolts, screws, nuts and other general engineering use . Engage in low tensile strength materials such as castings, mild steel and other soft materials processed internally threaded coarse thread should be used to make the trip to get the best internal thread strength . UNC threaded Hydraulic adapters require fast demolition or likely to cause corrosion and minor damage the site. UNF fine thread series This series should not be used for coarse thread bolts , screws, nuts and other applications . UNF external thread with a coarse thread than large tensile stress area . When asked to match male and female tripping strength equal to or greater than the tensile external threaded parts carrying capacity , the appropriate use fine thread . Fine thread also applies to the short length of the rotary joint , small thread lead angle or wall thickness required fine tooth pitch of the occasion. If the external thread maximum strength is not required, then the fine thread can also be used on low- strength materials processing internal thread, but you must choose the right rotary joint lengths to meet the strength requirements of the trip .Size of less than and equal to 1 inch fine thread for bolts, screws, Hydraulic ferrulesthreaded fasteners . Sizes larger than one inch , fine thread does not apply unless the external thread of the same material . UNEF fine thread series This series is suitable for thin-walled tubes, thin nuts , short- sleeve or short- joints and other requirements of the short length and smaller screwing pitch occasions. In general, it also applies to the provisions on the face of fine thread several situations UN constant pitch series 4,6,8,12,16,20,28 and 32 teeth per inch various constant pitch series UNC, UNF and UNEF series can not meet the requirements of the special design provides a wide range of diameters / pitch combinations. Constant pitch series for multiple assembly and disassembly of threaded parts or refurbished parts favor . Choose from a constant pitch series threads, preference should be as tabulated 8,12 or 16 tooth series. High temperature and high strength using the occasion to use these occasions , the size is 0.25 to 1 inch threaded recommended coarse thread series, and sizes larger than one inch , the best 8- tooth series.