How Can You Ensure Weather-Tight Sealing in Metal Building Panel Assemblies?

Our custom chamfered hex washer head SEMS screws combine aluminum washers with black EPDM gaskets for superior weather resistance in metal roofing and siding applications. Each fastener undergoes ISO-compliant inspection measuring washer diameter, height, and EPDM compression characteristics to guarantee consistent sealing performance. With pointed stainless steel tails for easy panel penetration and multiple corrosion-resistant material options, our SEMS screws eliminate the need for separate washer handling while ensuring reliable long-term weatherproofing. Contact us to receive custom samples tested to your specific panel assembly requirements.

Every component undergoes rigorous inspection throughout the manufacturing process and before shipping, fully complying with ISO working instructions. Our comprehensive quality control utilizes advanced inspection tools including calipers, protrusion-height gages, micrometers, and 2.5D/2D projectors to verify critical measurement points across the flat and corner, washer diameter and height, thread specifications, pitch accuracy, and EPDM washer dimensions. With 45 years of Taiwan manufacturing expertise and over 10,000 fastener products in our portfolio, we deliver customized SEMS screw solutions that meet the most stringent OEM requirements for reliable, weather-resistant assembly applications across metal building, automotive, HVAC, and industrial equipment sectors.