Stainless steel worm gear clamp has a series 300 stainless steel band and housing, a stainless steel screw, and is appropriate for use in marine environments. A worm gear mechanism adjusts the clamps diameter to precisely apply sealing pressure and the clamps four-piece construction helps provide strong clamping. The band, housing and screw are made of stainless steel that conforms to the Society of Automotive Engineers (SAE) 300 series standard and provides resistance to corrosion in marine environments. The slotted 5/16 hex-head screw allows installation using a blade screwdriver, nut driver, or socket wrench.