ANSI B18.2.1 Hex Cap Screws (SAE Grade 2/5/8)

1. Product Overview

We are proud to officially launch our brand-new ANSI B18.2.1 hex cap screws, a dedicated American standard product line that fills our gap in US standard fasteners and has no overlap with all previously released DIN standard products.ANSI B18.2.1 is the core American standard for hex cap screws, featuring a full thread or half thread design, hex head for easy wrench operation, and wide applicability in North American machinery, construction, automotive and industrial assembly. All products strictly comply with ANSI B18.2.1, SAE J429 standards, with precise thread pitch, uniform head size and stable mechanical performance, specially tailored for North American market procurement and export projects.

2. Core Product 

FeaturesStandard ANSI hex head design, perfect fit for American standard wrenches, no slipping during installationFull thread (UNC/UNF) and half thread options, meeting different assembly depth and load requirementsStrictly follow SAE grade standards, clear strength classification, matching different load scenariosSmooth thread surface, no burrs, easy to screw in and disassemble, reusableComplete specifications: #4–1/2 inch, regular sizes in stock, support custom lengthsMultiple materials and surface treatments, adapting to indoor, outdoor and anti-corrosion environments

3. Grade, Material & Specification 

ANSI StandardSAE GradeMaterialSurface TreatmentThread TypeMain ApplicationANSI B18.2.1Grade 2Low Carbon SteelZinc Plated (Clear/Blue)UNC/UNFLight-duty machinery, furniture, general assembly, low-load occasionsANSI B18.2.1Grade 5Medium Carbon Steel (Heat Treated)Zinc Plated / Black OxideUNC/UNFGeneral machinery, automotive parts, construction brackets, medium-load applicationsANSI B18.2.1Grade 8Alloy Steel (Heat Treated)Black Oxide / Zinc Plated (Yellow)UNC/UNFHeavy-duty machinery, high-strength structures, automotive suspension, high-load occasionsANSI B18.2.1A2-70304 Stainless SteelNatural PolishedUNC/UNFOutdoor, coastal, humid environments, anti-rust anti-corrosion applications

4. Matching & Typical Application Scenarios

This ANSI hex cap screw series is specially designed for North American market and global projects requiring American standard fasteners, mainly used in:North American machinery manufacturing, automotive assembly, heavy equipment maintenanceConstruction engineering, steel structure brackets, pipeline supports in North America and South AmericaIndustrial MRO (Maintenance, Repair and Operations) for American standard equipmentExport projects matching ANSI standard, OEM/ODM supporting for North American customersHardware distributors focusing on American standard fasteners, retail and bulk procurement

5. Why Choose GTZL ANSI B18.2.1 Hex Cap Screws

We focus on American standard fastener production and export, with rich experience in matching North American market needs, solving the pain points of inconsistent standards and unstable quality for overseas buyers.Strictly follow ANSI B18.2.1 and SAE J429 standards, thread pitch and size 100% compliant with American standard requirementsHeat treatment process strictly controlled, each grade meets the specified tensile strength and hardness requirementsRegular sizes in stock, fast delivery for small trial orders and bulk container ordersComplete export documents, including material certificate, grade test report, customs declaration documentsSupport custom lengths, surface treatments and OEM packaging, meeting the personalized needs of North American customersLong-term stable supply to North America, South America and other markets, familiar with local procurement standards

6. Conclusion

The launch of ANSI B18.2.1 hex cap screws enriches our American standard fastener product line, enabling us to provide more comprehensive one-stop procurement solutions for global buyers, especially those focusing on the North American market.With standard compliance, stable quality, complete specifications and professional export service, this series will become the preferred choice for American standard fastener procurement. We will continue to expand our standard product portfolio, covering DIN, ANSI, ISO and other mainstream standards, to meet the diversified procurement needs of global customers.