Business Details
22 Years
experience
Your Trusted Source for Industrial Fasteners in Houston
Sigma Fasteners has been a trusted provider of high-quality bolting and coating solutions for the energy industry since 2004. As an ISO 9001:2015-certified manufacturer and distributor, we specialize in API Monogrammed bolting products, including API 20E-0017 and API 20F-0007 specifications, ensuring compliance with the highest industry standards. Our expertise extends to custom manufacturing of ASTM-compliant bolts tailored to exact customer prints, alongside a comprehensive range of standard fasteners. We pride ourselves on delivering critical bolting solutions for energy and petrochemical applications globally, supported by advanced coating technologies like Xylan, Sermagard, and Everlube to enhance corrosion resistance and operational longevity.With a 35,000+ square foot facility in Houston, Texas, we combine cutting-edge CNC capabilities with rigorous quality control to meet the demands of offshore, refining, and pipeline sectors. Our commitment to on-time delivery and technical excellence has earned us placement on the approved vendor lists of major wellhead manufacturers worldwide. Backed by certifications from the American Petroleum Institute and decades of specialized experience, we provide rapid response times and personalized service to address complex bolting challenges across diverse environments, from Arctic conditions to tropical climates.
Services
Custom Bolting
Coated Bolts
Stud Bolts
Flange Bolt Charts
International Shipping
Quality Certifications
API Monogram Products
Corrosion Protection
Fastener Distribution
CNC Manufacturing
Details
- Year established: 2004
Highlights and features
- ISO 9001:2015 certified quality management system
- API 20E-0017 and API 20F-0007 monogram certifications
- Global shipping capabilities to 70+ countries
- Custom manufacturing up to 4" diameter bolts
- Advanced coating technologies for extreme environments
Associations and certifications
- ISO 9001:2015
- API Q1 Certified
- API Monogram 20E-0017
Services
Custom Bolting
Sigma Fasteners produces custom-engineered bolts to exact specifications, including materials like Inconel 718, 17-4PH, and ASTM L7M. Our CNC machining capabilities handle diameters up to 4 inches and lengths exceeding 4 feet, meeting API, ASTM, and customer-specific requirements. These components ensure reliable performance in critical energy sector applications.
Coated Bolts
We apply advanced coatings including Xylan fluoropolymers, Sermagard ceramic-metallic systems, and Everlube formulations. These treatments provide corrosion resistance up to 4,000 hours in salt spray testing while maintaining lubricity for safe disassembly. Our coating solutions meet NACE and API standards for offshore and petrochemical environments.
Stud Bolts
Manufacturing all-thread, tap-end, and double-end stud bolts in ASTM A193 and ASME B16.5 specifications. Available in multiple grades including B7, L7, and stainless steel, these components ensure secure flange connections in pipelines, drilling equipment, and pressure vessels across global energy infrastructure.
International Shipping
Sigma Fasteners delivers precision fasteners worldwide with specialized export packaging and documentation. Our logistics network supports direct shipments or freight forwarder coordination, including proforma invoicing and compliance with international shipping regulations for reliable delivery to 70+ countries.
API Monogram Products
As an API-licensed manufacturer, we produce 20E-0017 and 20F-0007 monogrammed bolting to API Spec Q1 standards. These products meet rigorous quality requirements for upstream and midstream energy applications, with traceability and testing documentation to ensure compliance with global industry specifications.
Questions
What certifications does Sigma Fasteners hold?
Sigma Fasteners is ISO 9001:2015 certified and holds API Monogram licenses for 20E-0017 and 20F-0007 products, with API Spec Q1 certification for quality management systems.
Do you offer custom fastener manufacturing?
Yes, we produce custom bolts up to 4" diameter and 4+ feet in length, following customer prints and specifications for materials like Inconel, stainless steel, and specialty alloys.
What coating options are available?
We offer Xylan fluoropolymer coatings, Sermagard ceramic-metallic systems, Everlube formulations, zinc electroplating, and other corrosion protection solutions meeting NACE and API standards.
Can you ship internationally?
Yes, we provide global shipping with proper export documentation and packaging, serving customers in over 70 countries through direct or freight forwarder arrangements.
What industries do you serve?
We primarily support energy sectors including oil & gas, petrochemical, refining, and offshore operations, with products meeting API, ASTM, and ASME standards.
What fastener sizes do you stock?
Our Houston warehouse stocks standard fasteners from 1/4" to 24" sizes, with custom manufacturing capabilities up to 4" diameter bolts and specialized threading options.
