External Thread Sems Screw Stainless Steel Passivation Metric Machine

External thread sems screw is the screw with an external thread washer, the washer is also known as a tooth lock washer, external thread sems screw usually used on the part needs to be locked tightly. External thread washer is a washer with serrations that extend radially inward or outward to bite into the bearing surface. This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminum or plastic, and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth). There are four types: internal, external, combination, and countersunk. The internal style has the serrations along the inner edge of the washer, which makes them more aesthetically pleasing. The external style has the serrations around the outer edge, which provides better holding power, because of the greater circumference. The combination style has serrations about both edges, for maximum holding power. The countersunk style is designed to be used with flat-head screws. Ever Hardware provides custom-made fasteners and customizable packaging.

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• Provide our client with a smaller MOQ and a broad range of products.
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