May 21, 2026

Sigma Fasteners – Leading API Bolting & Industrial Fastener Manufacturer

Sigma Fasteners is a trusted leader in the manufacturing and distribution of API bolting and industrial fasteners for the global energy, oil & gas, and petrochemical industries. Specializing in ASTM bolting specified by the American Petroleum Institute, Sigma Fasteners is committed to delivering precision-engineered fastening solutions that meet the highest industry standards. The company proudly holds API 20E-0017 and API 20F-0007 Monogram certifications along with API Spec Q1 9th Edition and ISO 9001:2015 certification, reflecting its dedication to quality, safety, and performance. From standard fasteners to fully customized bolts manufactured as per client specifications and technical drawings, Sigma Fasteners delivers reliable products designed for demanding industrial environments and critical offshore applications.

As a globally recognized industrial fastener manufacturer, Sigma Fasteners also provides advanced coating solutions including Whitford Xylan™, SermaGard® Ceramic Metallic coatings, Everlube products, and MacDermid Chloride Zinc electroplating with trivalent chromate for enhanced corrosion resistance and durability. Serving major wellhead manufacturers, offshore BOP operations, and leading petrochemical companies worldwide, Sigma is known for rapid response times, engineering expertise, and superior customer support. With a strong focus on quality manufacturing, custom bolting solutions, and innovative protective coatings, Sigma Fasteners continues to be a preferred partner for high-performance fastening systems in critical industrial sectors.