CALL US: 888.307.8811 - INQUIRIES: INFO@NATIONALBOLT.COM Celebrating our 23rd year in the fastener industry! National Bolt & Nut, Inc. (NBN) is a Domestic Manufacturer of large diameter custom non-standard fasteners for critical care applications. NBN supplies Bolts, Nuts, Studs and Washers to the Agricultural, Energy, Heavy Equipment , Mining, Petrochemical, and Rock Crushing industries. We have provided "blue print specials" since 1996 in all grades of steel and exotic materials. Our ISO compliant Quality Program challenges NBN to identify ways to best serve ever changing customer needs. All fasteners are manufactured to ASME, ASTM, DIN, ISO and to customers proprietary standard specifications. NBN guarantees to offer custom quality fasteners at the best price with the fastest industry lead times available.