Alloy 20 Fasteners

Need an dependable alloy 20 fastener? Alloy 20 Fasteners on MetalMitra come in standard and custom dimensions to ASTM B 472 / ASME SB 472, ready for bolted joints that stay tight.

Alloy 20 Fasteners are mechanical joining components such as bolts, nuts, studs, screws and washers used to assemble flanges, structures, machinery and equipment.

Alloy 20 (UNS N08020) was developed specifically to stand up to sulphuric acid. Alloy 20 (UNS N08020) is a niobium-stabilized nickel-iron-chromium alloy with copper and molybdenum, developed for excellent resistance to sulphuric acid and other aggressive chemical environments.

Available forms & variants

• Bolts — Hex, heavy hex, stud, U, J, T, eye and foundation bolts.
• Nuts — Hex, heavy hex, lock, wing, dome and nylock nuts.
• Studs & Threaded Rods — Fully and partially threaded studs and rods.
• Screws & Washers — Machine screws, socket screws, plain and spring washers.

Performance highlights

• Sulphuric Acid Resistance — Developed specifically for sulphuric acid service.
• Stress Corrosion Resistance — Good resistance to chloride stress corrosion cracking.
• Niobium Stabilized — Reduced risk of carbide precipitation during welding.
• Good Fabricability — Forms, machines and welds without fuss.

Typical applications

• Chemical Processing
• Sulphuric Acid Plants
• Pharmaceutical
• Petrochemical
• Pickling Equipment
• Food Processing
• Synthetic Fibre Plants
• Heat Exchangers
• Process Piping
• Storage Tanks
• Fabrication
• General Engineering

Quality checks & certification

Every lot of Alloy 20 Fasteners sourced through MetalMitra can be inspected and documented to the governing standard and your purchase order.

• Dimensional & thread inspection
• Visual inspection
• Grade verification against the order
• Chemical composition verification
• Mechanical / proof load testing as applicable
• Hardness testing as applicable
• EN 10204 3.1 Mill Test Certificate
• Project-specific documentation on request

Why buy through MetalMitra

• Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
• One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
• Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
• Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.

Ready to buy?

Send your size, grade, quantity and delivery location for Alloy 20 Fasteners, and matching suppliers on MetalMitra will come back with offers.

Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.