Oshwin Overseas-Supplier of SS904L Fastener. Oshwin Overseas is a well-known and trusted supplier of SS 904L products such as SS 904L Fasteners Suppliers | UNS N08904 Fasteners | WNR 1.4539 Fasteners | 904L Stainless Steel Bolts Fasteners | TP 904L Fasteners | SS 904L Nuts Fasteners | Fasteners Manufacturers|