Fasteners designed with a groove under the head accommodate a rubber O-ring that compresses to form a complete seal, permitting full metal-to-metal contact.
The 18-8 stainless-steel fasteners are passivated per QQP-35 and withstand wet environments. Screws come in nominal sizes of #4 through 1/4-20. O-rings are available in a range of materials: silicone, flourosilicone, and Buna rubber. Custom finishes include black oxide and sand blasted. Special lengths or captive configurations can be tooled on request.
Zago Mfg. Co. Inc.
190 Murray St.
Newark, NJ 07114