Stainless Steel 316 Hex Head Bolt

About Stainless Steel 316 Hex Head Bolt

Stainless Steel 316 Hex Head Bolts (commercially designated as A4 or marine-grade stainless steel) are ultra-premium fasteners engineered specifically for maximum corrosion resistance in highly aggressive environments. Featuring a standard six-sided hexagonal head for optimal wrench torque distribution, these bolts differ fundamentally from standard 304 stainless steel through the integration of molybdenum, which actively prevents pitting and crevice corrosion triggered by chlorides, industrial chemicals, and saltwater.

Key Features

• Molybdenum-Enhanced Composition: Contains 1618% chromium, 1014% nickel, and 23% molybdenum, providing superior defence against marine salts, acids, and chemical solutions.

• Marine-Grade Pitting Resistance: Purpose-built to endure continuous immersion or exposure to salt spray without rusting, sustaining structural integrity where standard metals fail.

• Exceptional Mechanical Performance: Delivers a minimum tensile strength of 515 MPa and a minimum yield strength of 205 MPa (typically produced under strain or solution-annealed standards like ASTM A276 or ASTM A193 B8M).

• Cryogenic & High-Heat Tolerance: Retains high toughness and resists scaling at elevated thermal limits up to 870C, as well as sub-zero cryogenic environments.

Technical Specifications

Primary Applications

• Marine & Coastal Infrastructure: Perfect for boat hardware, oil drilling platforms, docks, and underwater enclosures exposed to seawater.

• Chemical & Pharmaceutical Plants: Used heavily to assemble pipelines, mixing vats, and storage tanks handling aggressive acids, chlorides, or bleaching agents.

• High-Sanitation Food Processing: Installed in industrial kitchens and brewing facilities where harsh, corrosive washdown chemicals are regularly applied.