Service OverviewService
Service
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CLASSIFICATION OF SCREWS
THE MAIN CATEGORIES INCLUDE ORDINARY SCREWS, MACHINE SCREWS, SELF-TAPPING SCREWS AND EXPANSION SCREWS.
ORDINARY SCREWS:THE HEAD SIZE, DIAMETER, LENGTH, HEAD THICKNESS, THREAD PITCH, ETC. IN THE SPECIFICATIONS ARE ALL NATIONAL STANDARD SPECIFICATIONS, AND NO SPECIAL SPECIFICATIONS OR NON-STANDARD SPECIFICATIONS WILL APPEAR.
MECHANICAL SCREW:ITS EXTERNAL THREAD CAN BE USED FOR INTERNAL SCREW ROTAITON.
SELF-TAPPING SCREW:USUALLY FINGERTIPS, COARSE-TOOTHED, HARD WOOD SCREWS, INCLUDING ALUMINUM ALLOYS AND PLASTICS. SPECIAL SELF-TAPPING SCREWS USED TO PENETRATE METAL HOLES ARE CALLED TAPS.
EXPANSION SCREW:GENERALLY SPEAKING, IT IS A METAL EXPANSION SCREW. THE FIXING OF THE EXPANSION SCREW IS TO USE THE WEDGE-SHAPED SLOPE TO PROMOTE THE EXPANSION TO PRODUCE FRICTIONAL BINDING FORCE TO ACHIEVE THE FIXED EFFECT.