Pan Head, Philips, Self Tapping Screw is one of the most commonly used mechanical fasteners for insulation jacketing. The cross recess in this screw helps to uniformly apply the torque while fixing the screw on metal sheet. Most common size is 4.2 x 13 mm and 4.8 x 13 mm. Sealumet also provides Neoprene or EPDM Washers are available with screws on request. SS304 and SS316 are most common grades. However other grades are available upon request.