Types of Self Tapping Screws
AMK Products offers bulk self-tapping screws such as Fillister, Flat, Hex and Hex SEMS, Hex Washer and Hex Washer SEMS, Oval and Oval SEMS, Pan and Pan SEMS, Round and Round Washer, Sockets, Truss and Wafer. These tapping fasteners typically are used when working with thin metal or plywood. The thread spacing makes them ideal for applications in which there are pre-drilled holes.
There are three main types: Type A, Type AB and Type B. Type A screws are characterized by coarse threads used for wood or metal. Type AB have finer threads for use with thin metals , and Type B feature blunt points for safety.
AMK’s selection of wholesale self-tapping screws includes hard to find items and far more USA made than other suppliers.
A broad range of special configurations and finishes are offered. The most common finishes for bulk tapping screws are plain (stainless), phosphate & oil, Delta Seal Black, zinc & wax, zinc & yellow, cadmium & wax, chromium and chromium substitute. Note that AMK often applies “chrome” over stainless steel. This provides a chrome finish with no risk of corrosion. Some tapping screws also feature a sealant such as bi-wax sealer or mastic.
To ensure the finest details AMK frequently supplies tooling and SEMS washers directly to the manufacturers producing our products. This is done to guarantee the outcome of desired characteristics such as drive entrance engagement, head radius, face diameter, markings, indention criteria and washer characteristics etc.
AMK offers an especially rich selection of bulk tapping screws in several categories including Hex and Hex SEMS, Hex Washer, Oval in stainless steel, Oval SEMS and Pan head options.
AMK offers a great selection of bulk wholesale tapping screws with pre-attached washers called “SEMS”. Let’s learn about them … “SEMS” stands for “Screw and Washer Assembly”. The process requires a washer with an exact inside diameter, large enough to fit onto the screw blank before thread rolling and smaller than the major thread diameter so it will not slip off after thread rolling. A “SEMS roller” is utilized. This thread rolling machine is equipped with a special washer feed system to automate the installation of the washer. AMK goes beyond normal to ensure the quality of our bulk tapping screws. AMK stocks and supplies over 1 million SEMS washers to our manufacturers annually. We are very familiar with the intricacies of conical, conical tooth, external, internal/external, countersunk, finish and additional special types of SEMS washers.
Most AMK Products self tapping screws are manufactured in USA.
