Service OverviewService

		OEM/ODM If you ... 1. Are looking for OEM/ODM manufacturers in this industry. 2. Need someone that can produce what you want and have a custom  design printed to your specificat on.  Then our OEM/ODM service is for you! Send Customized Request			Sample Order If you ... 1. Want to purchase a sample order first. 2. Purchase a full order after validating the product quality. Then our Sample Order service is for you! Sample Order
		Factory Tour If you... 1. Would like more information about our company. 2. Would like to visit China and are interested in working with us. Then our Factory Tour service is for you! Learn More

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.