Hex flange washer head is one of our most popular products, these types of screws are widely used in the roofing industry. Like how it is named, the hex flange screws have a larger bearing rim compared to the washer head. They are usually assembled with an EPDM rubber washer and undercut design for water-proof purposes. We offer different options for the hex flange self drilling screw(roofing screw)- *Thread* -Full thread -Half thread/double thread (SJ-30053) -Cutting lines on thread available
*Finish* -electroplating zinc or yellow zinc -rupsert coating 500H/1000H/1500H -mechanical galvanized
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