OnlineMetals Bronze Round Bar 655 0.375″ x 12″ H04 ASTM B98

Description

Product Overview

The OnlineMetals 655 Bronze Round Bar is engineered from high‑quality silicon bronze, a copper‑based alloy renowned for its superior strength, excellent corrosion resistance, and outstanding resilience in harsh environments. With a precise 0.375 inch (9.5 mm) diameter and a convenient 12 inch (305 mm) length, this bar offers a versatile size that fits a wide range of industrial and marine applications. The bar is supplied in an unpolished mill finish, preserving the natural texture of the alloy and allowing end users to apply custom surface treatments, machining, or finishing processes as required.

Manufactured to ASTM B98 standards, the material composition of 655 bronze typically includes approximately 5 % silicon, 1 % manganese, and trace amounts of iron and zinc, which together enhance the alloy’s hardness and wear resistance while maintaining excellent ductility. The H04 temper designation indicates that the bar has been cold‑worked to a moderate degree, providing a balance between strength and formability that is ideal for machining, bending, and forging operations. Each bar weighs 6.56 ounces (186 grams), making it lightweight enough for easy handling yet substantial enough to deliver the mechanical performance demanded by demanding applications.

OnlineMetals, a trusted supplier in the raw‑materials market, ensures that every batch of bronze round bar undergoes rigorous quality control testing, including dimensional verification, tensile strength assessment, and corrosion testing. The product’s consistent dimensions and material properties enable engineers and fabricators to rely on repeatable results, reducing waste and streamlining production workflows. Whether you are designing a new marine component, repairing existing hardware, or prototyping a custom solution, this bronze round bar offers the reliability and performance needed to meet exacting standards.

Usage

Marine hardware manufacturers frequently select 655 bronze for its ability to withstand saltwater exposure without succumbing to pitting or dezincification. The bar’s inherent corrosion resistance makes it an excellent choice for producing propeller shafts, pump impellers, valve stems, and other components that operate continuously in seawater or brackish environments. In addition to marine applications, the alloy’s high fatigue strength and good wear characteristics lend themselves to the fabrication of fasteners, bushings, and bearing sleeves used in heavy‑duty machinery, automotive systems, and aerospace assemblies.

Design engineers appreciate the bar’s formability, which allows it to be easily machined, turned, or milled into complex geometries. The unpolished mill finish provides a clean surface that can be further processed through polishing, anodizing, or coating to meet specific aesthetic or functional requirements. Because the bar conforms to ASTM B98 specifications, it can be confidently incorporated into projects that demand compliance with industry standards, such as naval shipbuilding, offshore oil platforms, and high‑performance racing components.

For hobbyists and small‑scale fabricators, the manageable size of the bar simplifies inventory management and reduces material waste. The 0.375 inch diameter is compatible with standard lathe tooling, while the 12 inch length offers sufficient stock for multiple parts or for creating custom lengths through cutting. Whether you are constructing a prototype, repairing a critical component, or developing a new product line, the OnlineMetals 655 Bronze Round Bar provides a reliable foundation that supports both precision engineering and rapid prototyping.

Why Choose Us

Choosing OnlineMetals means partnering with a supplier that prioritizes material integrity, consistent supply, and responsive customer service. Our commitment to ASTM B98 compliance guarantees that every bar meets the stringent chemical composition and mechanical property requirements demanded by professional engineers and manufacturers. We source our raw copper and alloying elements from reputable mines and smelters, ensuring traceability and minimizing the risk of impurities that could compromise performance.

Our state‑of‑the‑art production facilities employ advanced casting, rolling, and heat‑treatment processes that produce uniform grain structures and reduce internal stresses. This results in a bronze bar that exhibits predictable behavior under load, making it easier to design components with reliable safety factors. In addition, our quality assurance team conducts dimensional inspections using calibrated micrometers and laser measurement systems, guaranteeing that each bar adheres to the specified 0.375 inch diameter tolerance of ±0.001 inch.

Beyond product quality, we offer comprehensive technical support to help you select the right material, understand machining best practices, and troubleshoot any issues that arise during fabrication. Our knowledgeable staff can provide guidance on heat‑treatment options, surface‑finishing techniques, and alloy alternatives, ensuring that you achieve the optimal balance of strength, durability, and cost‑effectiveness for your specific application.

We also understand the importance of timely delivery in fast‑paced manufacturing environments. Our streamlined order processing, combined with multiple fulfillment centers across the United States, enables us to ship orders quickly and reliably, reducing lead times and keeping your production schedule on track. When you purchase the OnlineMetals 655 Bronze Round Bar, you receive not only a high‑performance material but also a partnership built on trust, expertise, and a shared commitment to excellence.

Key Features

• High corrosion resistance ensures long‑term performance in marine and outdoor environments.
• H04 temper provides a balanced combination of strength and formability for easy machining.
• Meets ASTM B98 standards, guaranteeing consistent chemical composition and mechanical properties.
• Unpolished mill finish allows custom surface treatments, polishing, or coating to suit specific needs.
• Dedicated customer support and technical assistance for seamless integration into your projects.

FAQ

What does the H04 temper designation mean for this bronze bar?

H04 indicates that the bar has been cold‑worked to a moderate degree, which increases its tensile strength while preserving good ductility. This temper is ideal for applications that require both durability and the ability to be machined or formed into complex shapes without cracking.

Is this bronze bar suitable for direct exposure to seawater?

Yes. The 655 silicon bronze alloy is specifically formulated for excellent resistance to saltwater corrosion, making it a preferred material for marine hardware such as propeller shafts, pump components, and valve stems that operate in harsh oceanic conditions.

Can I request a different finish, such as polished or coated, instead of the unpolished mill finish?

While the standard offering is an unpolished mill finish, we can accommodate special surface‑treatment requests, including polishing, plating, or anodizing, subject to additional processing time and cost. Please contact our support team to discuss your specific finish requirements.

How does this product comply with ASTM B98, and why is that important?

ASTM B98 defines the chemical composition, mechanical properties, and dimensional tolerances for copper‑based alloys like 655 bronze. Compliance ensures that the bar meets industry‑accepted standards for strength, ductility, and corrosion resistance, providing confidence that the material will perform reliably in critical applications.

What are the typical applications for a 0.375 inch diameter bronze bar?

This size is commonly used for manufacturing small‑to‑medium‑scale components such as fasteners, bushings, shafts, bearing sleeves, and custom fittings. Its dimensions make it compatible with standard machining tools, allowing fabricators to efficiently produce precise parts for automotive, aerospace, marine, and industrial equipment.