Bronze Round Bar 642 Unpolished HR50 Temper 0.375″ x 24″ OnlineMetals

Description

Product Overview

The 642 Bronze Round Bar is a high‑performance aluminum‑silicon‑bronze alloy engineered to meet ASTM B150 and AMS‑4634 specifications. Its unpolished mill finish preserves the natural texture of the metal, providing a surface that is both aesthetically distinctive and ready for further machining or finishing processes. With a precise diameter of 0.375 inches and a convenient length of 24 inches, this bar offers a balance of strength, ductility, and corrosion resistance that makes it a preferred choice for a wide range of industrial applications.

Manufactured by OnlineMetals, a trusted supplier in the raw materials market, the bar undergoes HR50 tempering, a heat‑treatment process that enhances tensile strength while maintaining good formability. The resulting material exhibits a tensile strength of approximately 70 ksi and a yield strength near 45 ksi, delivering reliable performance under cyclic loading and static loads alike. The alloy’s composition, featuring copper, aluminum, silicon, and trace amounts of manganese, contributes to its superior resistance to seawater, acidic environments, and general atmospheric corrosion.

Key physical attributes include a package dimension of 24 × 0.4 × 0.4 inches and a lightweight of 12.16 ounces, making it easy to handle, store, and transport. The product’s model number, 127621, aligns with OnlineMetals’ cataloging system, ensuring seamless integration into inventory management workflows. Customer feedback on the platform highlights a 4.5‑star rating, reflecting satisfaction with material quality, dimensional accuracy, and overall value.

Usage

Designed for versatility, the 642 Bronze Round Bar excels in applications where strength, wear resistance, and corrosion protection are paramount. Engineers frequently select this alloy for the fabrication of precision components such as gears, valves, pump shafts, and bearing housings. Its excellent machinability allows for turning, drilling, and threading with minimal tool wear, reducing production costs and lead times.

In marine environments, the alloy’s resistance to saltwater corrosion makes it ideal for propeller shafts, marine pump components, and offshore rig hardware. The bar’s thermal conductivity also supports applications requiring efficient heat dissipation, such as heat exchangers and cooling system components. Additionally, the material’s non‑magnetic properties are advantageous in electromagnetic interference‑sensitive equipment, where magnetic neutrality is required.

For hobbyists and small‑scale fabricators, the 0.375‑inch diameter provides a manageable size for manual machining, while the 24‑inch length offers sufficient stock for multiple parts or prototype development. Whether used in a university engineering lab, a small machine shop, or a large‑scale manufacturing facility, the bar’s consistent dimensions and reliable material properties simplify design calculations and quality control procedures.

Why Choose Us

OnlineMetals distinguishes itself through a commitment to material integrity, transparent sourcing, and responsive customer service. Every batch of 642 Bronze Round Bar undergoes rigorous testing for chemical composition, mechanical properties, and dimensional tolerance, ensuring that the product you receive matches the specifications advertised. Our streamlined ordering platform provides real‑time inventory visibility, allowing you to secure the exact quantity needed without delay.

We understand that material selection can be a critical decision in product development. That is why our technical support team is available to assist with alloy selection, heat‑treatment options, and machining recommendations. Should you encounter any issues during the manufacturing process, our after‑sales service includes prompt replacements, detailed material data sheets, and guidance on best practices for finishing and coating.

By partnering with OnlineMetals, you gain access to a global supply chain that prioritizes sustainability and ethical sourcing. Our facilities adhere to ISO 9001 quality management standards, and we continuously invest in process improvements to reduce waste and energy consumption. This dedication to responsible manufacturing not only benefits the environment but also translates into consistent product performance for our customers.

Key Features

• High strength HR50 temper provides reliable load‑bearing capacity.
• Excellent corrosion resistance extends service life in harsh environments.
• Easy machinability reduces tool wear and production time.
• Standard ASTM B150 compliance ensures industry‑accepted quality.
• Responsive customer support and after‑sales service for peace of mind.

FAQ

What does HR50 temper mean for this bronze bar?

HR50 is a heat‑treatment designation that indicates the material has been hardened to a specific strength level while retaining good ductility. This temper provides a balance of tensile strength and toughness, making the bar suitable for applications that experience both static and dynamic loads.

Can this bar be welded or brazed?

Yes, 642 aluminum‑silicon‑bronze can be welded using appropriate filler metals such as bronze or copper‑based alloys. Brazing is also a common joining method, especially for valve and pump components, because it offers strong, leak‑tight joints without compromising the base material’s corrosion resistance.

Is the unpolished mill finish suitable for final product aesthetics?

The mill finish is intentionally left unpolished to preserve the material’s natural texture, which can be advantageous for certain industrial applications where surface roughness aids in lubrication or grip. If a smoother appearance is required, the bar can be machined, sanded, or polished to the desired finish.

How does this alloy compare to standard carbon steel for gear manufacturing?

Compared to carbon steel, 642 bronze offers superior corrosion resistance, especially in marine or chemical environments, and provides better wear characteristics when paired with compatible lubricants. While carbon steel may have higher ultimate tensile strength, the bronze’s combination of strength, ductility, and resistance to fatigue makes it a competitive alternative for many gear applications.

What certifications or standards does this product meet?

The bar conforms to ASTM B150 and AMS‑4634 specifications, which define chemical composition, mechanical properties, and dimensional tolerances for aluminum‑silicon‑bronze alloys. These standards are widely recognized in aerospace, marine, and industrial sectors, ensuring that the material meets rigorous performance criteria.